检索结果-内蒙古大学图书馆

Evaluating the Seismic Performance of Combined Piled Raft Foundation (CPRF) Adjacent to Slope Crest

Iranian Journal of Science and Technology - Transactions of Civil engineering 2024年 1-30页

作者： Panahpour, Hassan Akhlaghi, Tohid Hajialilue-Bonab, Masoud Department of Geotechnical Engineering Faculty of Civil Engineering University of Tabriz Tabriz Iran

Landslide and seismic hazards pose substantial risks to structures situated proximate to slope crests, jeopardizing both structural integrity and occupant safety. Comprehensive understanding and assessment of these hazards are imperative for mitigating potential threats and ensuring the protection of buildings and their inhabitants. Pile foundations play a crucial role in providing stability and support to structures, particularly those in close proximity to slopes, against seismic events. This study endeavors to empirically and computationally investigate the influence of slope angle on the bending moment experienced by piles within a Combined Piled Raft Foundation (CPRF) system located atop sloping crests, utilizing shaking table experiments and numerical simulations employing the FLAC-3D finite-difference software. A total of 97 tests, comprising 47 experimental trials and 50 numerical simulations, were conducted. Experimental and numerical models of CPRF installed at various slope angles on sloping terrain, scaled at a 1/25th ratio, were subjected to harmonic sinusoidal seismic excitations. The outcomes highlight the criticality of accounting for topographic effects on both the magnitude and location of maximum bending moments of piles, a pivotal parameter in CPRF assessments on slope crests. Results demonstrate a notable elevation in pile bending moments on sloping terrain compared to flat ground, ranging from 2 to 6 times higher, with sloping ground exerting a more pronounced influence during intense seismic activities. This study underscores the importance of considering slope angle in the design and analysis of CPRF structures situated on slope crests, emphasizing the necessity for tailored strategies to address the distinctive challenges posed by these specific topographic conditions. Insights garnered from this investigation contribute to the formulation of robust measures for enhancing the resilience of buildings in high-risk regions susceptible to landsl

关键词： CPRF Experimental FLAC-3D Numerical Pile Seismic Slope

来源：评论

学校读者我要写书评

暂无评论

Spatiotemporal deformation characteristics of Outang landslide and identification of triggering factors using data mining

引用

Journal of Rock Mechanics and geotechnical engineering 2024年第10期16卷 4088-4104页

作者： Beibei Yang Zhongqiang Liu Suzanne Lacasse Xin Liang School of Civil Engineering Yantai UniversityYantai264005China Norwegian Geotechnical Institute Oslo0855Norway Faculty of Engineering China University of GeosciencesWuhan430074China

Since the impoundment of Three Gorges Reservoir(TGR)in 2003,numerous slopes have experienced noticeable movement or destabilization owing to reservoir level changes and seasonal *** case is the Outang landslide,a large-scale and active landslide,on the south bank of the Yangtze *** latest monitoring data and site investigations available are analyzed to establish spatial and temporal landslide deformation *** mining technology,including the two-step clustering and Apriori algorithm,is then used to identify the dominant triggers of landslide *** the data mining process,the two-step clustering method clusters the candidate triggers and displacement rate into several groups,and the Apriori algorithm generates correlation criteria for the *** analysis considers multiple locations of the landslide and incorporates two types of time scales:longterm deformation on a monthly basis and short-term deformation on a daily *** analysis shows that the deformations of the Outang landslide are driven by both rainfall and reservoir water while its deformation varies spatiotemporally mainly due to the difference in local responses to hydrological *** data mining results reveal different dominant triggering factors depending on the monitoring frequency:the monthly and bi-monthly cumulative rainfall control the monthly deformation,and the 10-d cumulative rainfall and the 5-d cumulative drop of water level in the reservoir dominate the daily deformation of the *** is concluded that the spatiotemporal deformation pattern and data mining rules associated with precipitation and reservoir water level have the potential to be broadly implemented for improving landslide prevention and control in the dam reservoirs and other landslideprone areas.

关键词： Landslide Deformation characteristics Triggering factor Data mining Three gorges reservoir

来源：评论

学校读者我要写书评

暂无评论

Morphological damage and strength deterioration of red sandstone under freeze-thaw cycles

引用

Journal of Rock Mechanics and geotechnical engineering 2025年第2期17卷 671-687页

作者： Jincheng Wang Deshan Cui Qiong Chen Juxiang Chen Mingjie Dai Faculty of Engineering China University of GeosciencesWuhan430074China State Key Laboratory of Geomechanics and Geotechnical Engineering Institute of Rock and Soil MechanicsChinese Academy of SciencesWuhan430071China

Insight into the growth of internal microstructure and surface morphology is critical for understanding the robustness of red sandstone artifacts in frigid *** freeze–thaw(F-T)cycles can exacerbate the surface deterioration of water-bearing sandstone,a series of investigation on fresh and weathered water-bearing sandstone samples with different F-T cycle numbers(i.e.0–100)is performed in this study,including three-dimensional(3D)laser scanning,scanning electron microscope(SEM)and computed tomography(CT)scanning tests,thermal property tests,Brazilian tests,and multi-field numerical *** results demonstrate that with increasing F-T cycles,the surface fractal dimension and specific surface area of red sandstone samples increase,and the pore size distribution inside rocks shifts from ultrananopores(10–100 nm)to micro-pores(0.1–100μm)and ultramicropores(100μm+).Spatially,the pores generated by the F-T cycles are more prominent near the surfaces of rock *** simulation indicates that the uneven pore distribution leads to surface *** 100 F-T cycles,the intergranular(IG)cement of the samples cracks,and the IG fractures are widened;eventually,due to the structural integrity weakening,the tensile strength is drastically reduced by over *** thermal properties of the water-saturated sandstone can be improved during the F-T cycles,and a strong coefficient of determination of 0.98 exists between the fractal dimensions of sandstone surface and the tensile *** assessing the mechanical properties of stone artifacts under F-T cycles,the morphological damage of red sandstone should first be investigated when in situ sampling is inappropriate.

关键词： Freezing-thawing cycles Red sandstone Pore structure Surface fractal dimension Computed tomography(CT)reconstruction

来源：评论

学校读者我要写书评

暂无评论

Digital monitoring of rotary-percussive drilling with down-the-hole hammer for profiling weathered granitic ground

引用

Journal of Rock Mechanics and geotechnical engineering 2024年第5期16卷 1615-1636页

作者： Wendal Victor Yue Siyuan Wu Manchao He Yafei Qiao Zhongqi Quentin Yue Department of Geotechnical Engineering College of Civil EngineeringTongji UniversityShanghai200092China Department of Civil Engineering Faculty of EngineeringThe University of Hong KongPokfulam RoadHong KongChina State Key Laboratory for Geomechanics and Deep Underground Engineering China University of Mining and TechnologyBeijing100083China Key Laboratory of Geotechnical and Underground Engineering of Ministry of Education Tongji UniversityShanghai200092China

Rock and geotechnical engineering investigations involve drilling holes in ground with or without retrieving soil and rock samples to construct the subsurface ground *** the basis of an actual soil nailing drilling for a slope stability project in Hong Kong,this paper further develops the drilling process monitoring(DPM)method for digitally profiling the subsurface geomaterials of weathered granitic rocks using a compressed airflow driven percussive-rotary drilling machine with down-the-hole(DTH)*** transducers are installed on the drilling machine and record the chuck displacement,DTH rotational speed,and five pressures from five compressed airflows in real-time *** mechanism and operations of the drilling machine are elaborated in detail,which is essential for understanding and evaluating the drilling data.A MATLAB program is developed to automatically filter the recorded drilling data in time series and classify them into different drilling processes in sub-time *** processes include penetration,push-in with or without rod,pull-back with or without rod,rod-tightening and *** drilling data are further reconstructed to plot the curve of drill-bit depth versus the net drilling time along each of the six *** curve is found to contain multiple linear segments with a constant penetration rate,which implies a zone of homogenous geomaterial with different weathering *** effect from fluctuation of the applied pressures is evaluated *** analyses are presented for accurately assess and verify the underground profiling and strength in weathered granitic rock,which provided the basis of using DPM method to confidently assess drilling measurements to interpret the subsurface profile in real time.

关键词： Drilling process monitoring(DPM) Down-the-hole(DTH)hammer Percussive-rotary drilling Weathering granitic rocks

来源：评论

学校读者我要写书评

暂无评论

Numerical investigation on the responses of existing single piles due to adjacent twin tunneling considering the lagging distance

引用

Underground Space 2023年第4期11卷 171-188页

作者： Chana Phutthananon Somkiat Lertkultanon Pornkasem Jongpradist Ochok Duangsano Suched Likitlersuang Pitthaya Jamsawang Construction Innovations and Future Infrastructures Research Center Department of Civil EngineeringFaculty of EngineeringKing Mongkut’s University of Technology ThonburiBangkok 10140Thailand Geotechnical and Foundation Engineering Co. LtdBangkok 10230Thailand Centre of Excellence in Geotechnical and Geoenvironmental Engineering Department of Civil EngineeringFaculty of EngineeringChulalongkorn UniversityBangkok 10330Thailand Soil Engineering Research Center Department of Civil EngineeringKing Mongkut’s University of Technology North BangkokBangkok 10800Thailand

This paper presents an assessment of the influence of the lagging distance between two horizontal tunnel faces of the side-by-side twin tunnels on the responses of the adjacent existing single pile by a series of three-dimensional numerical *** different relative positions between the pile tip and the tunnel are considered to cover the short and long pile *** responses of the existing pile in terms of pile head settlement,axial force,lateral movement and bending moment are considered and *** numerical results indicate that the lagging distance between twin tunnel faces significantly affects not only the soil movements but also the responses of the existing single *** critical case that produces unsatisfactory pile responses due to twin tunneling is when the lagging distance between the second tunnel and the preceding tunnel equals to the shield *** is recommended that the lagging distance be not less than three times of shield length when the two tunnels need to be concurrently excavated.

关键词： Twin tunnels Tunnel lagging distance Existing pile Finite element analysis Pile responses

来源：评论

学校读者我要写书评

暂无评论

Weight Analysis of Impact Factors of Interbedded Anti-Inclined Slopes Block-Flexure Toppling Based on Support Vector Regression

引用

Journal of Earth Science 2024年第2期35卷 568-582页

作者： Bocheng Zhang Huiming Tang Yibing Ning Kun Fang Ding Xia Department of Engineering Geology and Geotechnical Engineering Faculty of EngineeringChina University of GeosciencesWuhan430074China Badong National Observation and Research Station of Geohazards China University of GeosciencesWuhan430074China College of Geological Engineering and Geomatics Chang’an UniversityXi’an710054China

Block-flexure toppling failure is frequently encountered in interbedded anti-inclined rock(IAR)slopes,and seriously threatens the construction of hydropower *** this study,we first investigated the Lean Reservoir area’s geological setting and the Linda landslide’s ***,uniform design and random design were used to design 110 training datasets and 31 testing datasets,***,the toppling response was obtained by using the discrete element ***,support vector regression was used to obtain the influence weights of 21 impact *** results show that the influence weight of the slope angle and rock formation dip angle on the toppling deformation among tertiary impact factors is 25.96%and 17.28%,respectively,which are much greater than the other 19 impact factors within the research *** the primary impact factors,the influence weight is sorted from large to small as slope geometry parameters,joints parameters,and rock mechanics *** parameters,especially the geometric parameters,cannot be ignored when evaluating the stability of IAR *** numerical simulation,it was qualitatively determined that failure surfaces of slopes were controlled by cross joints and that the rocks in the slope toe play a role in preventing slope deformation.

关键词： interbedded anti-inclined slopes block-flexure toppling impact factors numerical simulation support vector regression engineering geology

来源：评论

学校读者我要写书评

暂无评论

Characterization of geotechnical properties of Phnom Penh bedrock: A case study in Chrouy Chongvar and Dangkao Districts 58

Characterization of geotechnical properties of Phnom Penh be...

引用

58th US Rock Mechanics / Geomechanics Symposium 2024, ARMA 2024

作者： Boeut, S. Fujii, Y. Sieng, P. Kaing, S. Alam, Badrul A.K.M. Dzimunya, N.Z. Oudom, S. Boeut, S. Georesources and Geotechnical Engineering Department Institute of Technology of Cambodia Phnom Penh Cambodia Faculty of Engineering Hokkaido University Sapporo Japan Department of Petroleum and Mining Engineering Faculty of Civil Engineering MIST Dhaka Bangladesh Geotechnical Laboratory Ocean Civil Engineering Program Department of Engineering Kagoshima University Japan Department of Conservation of Monuments and Archaeology APSARA National Authority Cambodia

ISBN: (纸本)9798331305086

Bedrock layers support large load structures, while Phnom Penh faces limitations in mechanical properties. This research conducted rock testing on sandstone from Chroy Changvar and Dankao districts, both strongly developed zones in Phnom Penh. The fine-grain sandstones were compressed under varying conditions of confining stress of 0 to 6 MPa and pore water pressure of 1 MPa. Permeability was assessed at pore water pressures of 1 MPa and confining stress of 3 MPa. Core rock samples, collected at depths of 43 to 50 m below the surface from both sites, revealed characteristics. The dry and wet density of Chroy Changvar sandstone existed at 2,503 kg/m3 and 2,574 kg/m3, with a permeability value of 1.43∙10-14 m2 of pre-failure rock 1.87∙10-14 m2 showing slightly increase. The maximum peak stress ranged from 11 to 75 MPa. Shear properties were estimated, indicating an internal friction angle of 57-degree, rupture plane angle of 16.5 degrees, and cohesion of 1.6 MPa. Dangkoa siltsotne showed the value of dry and wet densities of 2,682 kg/m3 and 2,699 kg/m3, respectively, with intact rock permeability of 8.63∙10-15 m2 with highly increased in fractured rock permeability of 1.64∙10-12 m2. This rock existed of high stress under compression with the peak stress of 100 MPa to 330 MPa exhibited a brittle-rock type even the increase in confining stress. The internal friction angle of 71-degree, rupture angle of 10 degree, and cohesion of 11.2 MPa. The study provides insights into the contrasting mechanical properties of bedrock of two districts in Phnom Penh. Chroy Chongvar sandstone displayed plasticity, while Dankoa sandstone exhibited brittleness. These findings contribute valuable information for understanding and managing subsurface conditions in urban environments. Copyright 2024 ARMA, American Rock Mechanics Association.

关键词： Sandstone

来源：评论

学校读者我要写书评

暂无评论

Efficient Uncertainty Quantification in Seismic Site Response via Random Field Modeling

Efficient Uncertainty Quantification in Seismic Site Respons...

引用

geotechnical Frontiers 2025: Geotechnics of Natural Hazards

作者： Chala, Ayele Ray, Richard Structural and Geotechnical Engineering Dept. Faculty of Architecture Civil and Transport Sciences Szechenyi Istvan Univ. Gyor Hungary

ISBN: (数字)9780784485996

Assessing seismic site response with absolute certainty remains challenging due to inherent soil variabilities. Soil variabilities primarily stem from natural geologic processes and lie beyond human control. Soil characteristics, including shear wave velocity, shear modulus, unit weight, and plasticity, exhibit inherent randomness and variability. These factors significantly influence seismic site responses, making it crucial to account for parameter uncertainty in seismic behavior characterization. Precisely characterizing this uncertainty is essential for reliable seismic hazard assessment and the design of earthquake-resistant structures. However, this task faces challenges due to the computational expense associated with many model realizations. In this study, a computationally efficient and user-friendly model for estimating peak ground acceleration (PGA), displacement (PGD), and quantifying uncertainty was developed. The methodology comprises two main steps: (1) 2D equivalent linear seismic site response analyses were simulated using MIDAS GTS NX commercial software. These simulations incorporated randomly generated properties of clay soil, including maximum shear modulus (G0), unit weight (γ), and plasticity index (PI). (2) Leveraging data from the site response analyses, a Bayesian regression model was developed using the R programming language. The accuracy and reliability of the developed model were validated using a new data set, and the results closely aligned with finite element method (FEM) outcomes. By accounting for soil inherent variabilities, the model effectively characterizes the uncertainty of PGA and PGD using mean and coefficient of variation (CoV). Remarkably, the Bayesian approach yielded CoV of response parameters up to 2.33%, a substantial 94.37% relative difference compared to the FEM. Notably, this improvement in uncertainty was achieved while maintaining computational efficiency. © ASCE.

关键词： Shear strain

来源：评论

学校读者我要写书评

暂无评论

Analysis the Causes of the Slip Embankment Protecting the Slope of Lien Chieu Aviation Petroleum Depot 10th

Analysis the Causes of the Slip Embankment Protecting the Sl...

引用

10th International Conference on Civil engineering, ICCE2023

作者： Nguyen, Hong Nam Division of Geotechnical Engineering Faculty of Civil Engineering Thuyloi University 175 Tay Son Street Dong Da District Hanoi Viet Nam

ISBN: (纸本)9789819743544

The slope protection embankment of Lien Chieu aviation petroleum depot was built in 2001. The embankment is responsible for ensuring safety for the oil tank area and dispensing area, with the capacity of dispensing 13,800 m3 of fuel serving airports in the central region, from Hue to Binh Dinh provinces. In 2008, due to the occurrence of floods, a landslide has destroyed the entire 59.7 m middle segment of longitudinal embankment, leaving the foundation inert. The rest of the embankment body in the North was cracked on the entire surface;the embankment body fell inward;the weight relief plate was cut entirely from the embankment body and collapsed downwards. The collapse of the slope embankment led to the destruction of the oil tanks, causing the operation to stop. It was urgent at that time to investigate the causes of the slope failure and suggest the safe remedial design for the structure. The site investigation and numerical analyses show that the reasons for the failure could be due to the insufficiency of drainage holes to drain groundwater during the flood season characterized by heavy rain, which made the lateral pressure acting on the wall increase significantly, possibly causing the wall structure to be damaged. The proposed design which consists of a low retaining wall and upper slope embankment, both reinforced by geotextiles, could be stable according to numerical modelling with many loading cases. Attention must be paid to the stability of the excavation slope during construction and the difficulties of narrow space for the excavation. © The Author(s) 2024.

关键词： Floods

来源：评论

学校读者我要写书评

暂无评论

The use of fine portions from construction and demolition waste for expansive soil stabilization: A review

引用

Frontiers of Structural and Civil engineering 2022年第7期16卷 803-816页

作者： Mgboawaji Claude UJILE Samuel Jonah ABBEY Civil Engineering Faculty of Environment and TechnologyUniversity of the West of EnglandBristol BS161QYUK Geotechnical Engineering Faculty of Environment and TechnologyUniversity of the West of EnglandBristol BS161QYUK

Construction and demolition waste(CDW)are the largest waste products in the world today and competes as a viable recycled additive material in place of natural *** to the increase in compressive strength of different mix proportions of CDW,it is also considered for reuse in concrete and subbase *** study shows the effect of CDW in expansive soil *** chemical and mechanical properties of these materials have shown that they are capable of developing compressive strength properties for replacement of cement with significant reduction in carbon *** inherent compositional properties of recycled CDW compared in this review suggests that CDW have good filler properties in highly expansive *** of crushed brick and recycled aggregates characterised based on chemical properties of different replacement ratios suggests that CDW of good-quality aggregates reduces swell potential of expansive soils and increased mechanical strength in pavement construction.

关键词： mixed fine portions construction and demolition waste expansive soil soil stabilization

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：