检索结果-内蒙古大学图书馆

Effect of heterogeneity on mechanical and acoustic emission characteristics of rock specimen

Journal of Central South University 2010年第5期17卷 1119-1124页

作者：李术才李国莹 Geotechnical and Structural Engineering Research Center Shandong University

The influence of heterogeneity on mechanical and acoustic emission characteristics of rock specimen under uniaxial compress was studied with numerical simulation *** distribution function was adopted to describe the mesoscopic heterogeneity of *** failure process of heterogeneous rock specimen under uniaxial loading was simulated using FLAC 3D *** schemes were adopted to investigate the influence of *** results demonstrate that as the homogeneity increases,the peak strength and brittleness of rocks increase,and the macro elastic modulus improves as *** has great influence on macro elastic modulus and strength when the homogeneity coefficient is less than *** volume expansion is not so obvious when the homogeneity *** the homogeneity coefficient increases the acoustic emissions modes change from swarm shock to main *** the homogeneity coefficient is high,the cumulative acoustic emission events-axial strain curve is gentle before the rock *** numerical results agree with the previously numerical results and earlier experimental measurements.

关键词： heterogeneity acoustic emission strain softening numerical simulation uniaxial compression elastic modulus

来源：评论

学校读者我要写书评

暂无评论

Cohesion variation during instability evolution of disaster medium in mud inrush of mountain tunnel

引用

Journal of Mountain Science 2019年第11期16卷 2519-2531页

作者： YANG Teng ZHANG Qing-song ZHANG Xiao LI Xiang-hui ZHANG Jia-qi SUN Yu-xue LI Zhuang Geotechnical & Structural Engineering Research Center Shandong University

Mud inrush in mountain tunnel is an independent geological hazard type different from water inrush,landslide and debris *** intrinsic factor of mud inrush is the instability failure of disaster *** essence is that when the cohesion decreases gradually with the increase of void ratio to the point where the movement of soil particles cannot be restricted,soil particles and groundwater form slurry and gush ***,accurate calculation of cohesion with variable void ratios is crucial for analyzing the reliability of disaster *** this study,the disaster medium was regarded as graded soil and a structural model was established wherein soil particles were simplified as cubes and the inter-particle pores were represented by the clearance between *** the basis of the structure model of disaster medium,a function between the soil particle distance and void ratio was *** is equivalent to the resultant force between soil particles per unit area;thus,a cohesion function was derived in which the void ratio is the main *** function considers the influence of gradation characteristics on cohesion variation and is generally applicable to various types of disaster medium.A series of direct shear tests were carried out to determine the cohesion variation for different types of disaster medium with variable void *** comparing the variation of cohesion obtained through direct shear tests with those deduced by the proposed cohesion function,we verified the validity and general applicability of the cohesion *** is of great significance because the cohesion function can accurately predict the variation of cohesion by using the void ratio,and effectively evaluate the possibility of mud inrush according to the initial mechanical properties of disaster medium.

关键词： Cohesion Disaster medium Graded soil Structure model Void ratio Shear test

来源：评论

学校读者我要写书评

暂无评论

Stability analysis and optimization of excavation method of double-arch tunnel with an extra-large span based on numerical investigation

引用

Frontiers of structural and Civil engineering 2021年第1期15卷 136-146页

作者： Yiguo XUE Huimin GONG Fanmeng KONG Weimin YANG Daohong QIU Binghua ZHOU Geotechnical and Structural Engineering Research Center Shandong UniversityJinan 250061China

The Xiamen Haicang double-arch tunnel has a maximum span of 45.73 m and a minimum burial depth of 5.8 m.A larger deformation or collapse of the tunnel is readily encountered during tunnel *** is therefore necessary to select a construction approach that is suitable for double-arch tunnel projects with an extra-large *** this study,three construction methods for double-arch tunnels with extra-large spans were numerically ***,the deformation behavior and stress characteristics of the surrounding rock were obtained and *** results showed that the double-side-drift method with temporary vertical support achieves better adaptability in the construction of such tunnels,which can be observed from both the numerical results and in situ monitoring *** addition,the improved temporary support plays a critical role in controlling the surrounding rock *** addition,the disturbance resulting from the excavation of adjacent drifts was obvious,particularly the disturbance of the surrounding rock caused by the excavation of the middle *** present findings can serve as the initial guidelines for the construction of ultra-shallowly buried double-arch tunnels with extra-large spans.

关键词： double-arch tunnel triple-layer composite liner system numerical modeling stress analysis settlement

来源：评论

学校读者我要写书评

暂无评论

The Practice of Forward Prospecting of Adverse Geology Applied to Hard Rock TBM Tunnel Construction： The Case of the Songhua River Water Conveyance Project in the Middle of Jilin Province

引用

engineering 2018年第1期4卷 131-137页

作者： Shucai Li Lichao Nie Bin Liu Geotechnical and Structural Engineering Research Center Shandong University Jinan 250061 China

An increasing number of tunnels are being constructed with tunnel-boring machines （TBMs） due to the increased efficiency and shorter completion time resulting from their use. However, when a TBM encoun- ters adverse geological conditions in the course of tunnel construction （e.g., karst caves, faults, or frac- tured zones）, disasters such as water and mud inrush, collapse, or machine blockage may result, and may severely imperil construction safety. Therefore, the advance detection of adverse geology and water-bearing conditions in front of the tunnel face is of great importance. This paper uses the TBM tun- neling of the water conveyance project from Songhua River as a case study in order to propose a compre- hensive forward geological prospecting technical system that is suitable for TBM tunnel construction under complicated geological conditions. By combining geological analysis with forward geological prospecting using a three-dimensional （3D） induced polarization method and a 3D seismic method, a comprehensive forward geological prospecting technical system can accurately forecast water inrush geo-hazards or faults in front of the TBM tunnel face. In this way, disasters such as water and mud inrush, collapse, or machine blockage can be avoided. This prospecting technical system also has reference value for carrying out the forward prospecting of adverse geology for potential TBM tunneling and for ensuring that a TBM can work efficiently.

关键词： Hard rock TBM tunnels Comprehensive forward prospecting Geological analysis3D induced polarization3D seismic methodAdverse geology

来源：评论

学校读者我要写书评

暂无评论

Detection and treatment of water inflow in karst tunnel：A case study in Daba tunnel

引用

Journal of Mountain Science 2018年第7期15卷 1585-1596页

作者： LI Xiang-hui ZHANG Qing-song ZHANG Xiao LAN Xiong-dong DUAN Chong-hao LIU Jian-guo geotechnical & Structural Engineering Research Center Shandong UniversityJinan 250061 China

In a karst tunnel, fissures or cracks that are filled with weathered materials are a type of potential water outlet as they are easily triggered and converted into groundwater outlets under the influence of high groundwater pressure. A terrible water inrush caused by potential water outlets can seriously hinder the project construction. Potential water outlets and water sources that surrounding the tunnel must be detected before water inflow can be treated. This paper provides a successful case of the detection and treatment of water inflow in a karst tunnel and proposes a potential water outlet detection(PWOD) method in which heavy rainfall(>50 mm/d) is considered a trigger for a potential water outlet. The Daba tunnel located in Hunan province, China, has been constructed in a karst stratum where the rock mass has been weathered intensely by the influence of two faults. Heavy rain triggered some potential water outlets, causing a serious water inrush. The PWOD method was applied in this project for the treatment of water inflow, and six potential water outlets in total were identified through three heavy rains. Meanwhile, a geophysical prospecting technique was also used to detect water sources. The connections between water outlets and water sources were identified with a 3-D graphic that included all of them. According to the distribution of water outlets and water sources, the detection area was divided into three sections and separately treated by curtain grouting.

关键词： Karst tunnel Water inrush Potential water outlet detection Geophysical prospecting technique Water inflow Grouting

来源：评论

学校读者我要写书评

暂无评论

A grouting simulation method for quick-setting slurry in karst conduit:The sequential flow and solidification method

引用

Journal of Rock Mechanics and geotechnical engineering 2022年第2期14卷 423-435页

作者： Zhenhao Xu Dongdong Pan Shucai Li Yichi Zhang Zehua Bu Jie Liu Geotechnical and Structural Engineering Research Center Shandong UniversityJinan250061China

It is difficult to temporally and spatially track and characterize the slurry viscosity in flowing water during grouting *** this study,a sequential flow and solidification(SFS)method considering the spatial-temporal evolution of slurry viscosity in flowing water in karst conduit is ***,a time-dependent model for the threshold function of slurry viscosity is *** the grouting process,the spatial-temporal evolution of slurry viscosity is revealed by tracking the diffusion behavior of the slurry injected at different *** method is capable of describing the gradual solidification process of the slurry during ***,a physical model of grouting in a karst conduit is ***,the effectiveness of the SFS method in grouting simulation is verified by the experiment of grouting conduit in flowing *** SFS method enables real-time monitoring of fluid velocity and pressure during grouting in flowing water and provides a feasible calculation method for revealing the grouting plugging mechanism in complex karst conduits at different engineering *** addition,it can be used to guide the design of grouting tests in flowing water,improve cost efficiency,and provide theoretical basis for optimizing grouting design and slurry selection.

关键词： Karst conduit Sequential flow and solidification(SFS) Quick-setting slurry Grouting simulation method Grouting in flowing water

来源：评论

学校读者我要写书评

暂无评论

Protection against water or mud inrush in tunnels by grouting:A review

引用

Journal of Rock Mechanics and geotechnical engineering 2016年第5期8卷 753-766页

作者： Shucai Li Rentai Liu Qingsong Zhang Xiao Zhang Geotechnical & Structural Engineering Research Center Shandong University

Grouting is a major method used to prevent water and mud inrush in tunnels and underground engineering. In this paper, the current situation of control and prevention of water and mud inrush is summarized and recent advances in relevant theories, grout/equipment, and critical techniques are introduced. The time-variant equations of grout viscosity at different volumetric ratios were obtained based on the constitutive relation of typical fast curing grouts. A large-scale dynamic grouting model testing system （4000 mm × 2000 mm × 5 mm） was developed, and the diffusions of cement and fast curing grouts in dynamic water grouting were investigated. The results reveal that the diffusions of cement grouts and fast curing grouts are U-shaped and asymmetric elliptical, respectively. A multi-parameter real-time monitoring system （＆#981; = 1.5 m, h = 1.2 m） was developed for the grouting process to study the diffusion and reinforcement mechanism of grouting in water-rich faulted zone. A high early strength cream-type reinforcing/plugging grout, a high permeability nano-scale silica gel grout, and a high-expansion filling grout were proposed for the control of water hazards in weak water-rich faulted zone rocks, water inrush in karst passages, and micro-crack water inrush, respectively. Complement technologies and equipment for industrial applications were also proposed. Additionally, a novel full-life periodic dynamic water grouting with the critical grouting borehole as the core was proposed. The key techniques for the control of water inrush in water-rich faulted zone, jointed fissures and karst passages, and micro-crack water inrush were developed.

关键词： Tunnel engineering Water or mud inrushModel testsGrouting theoryGrouting control techniques

来源：评论

学校读者我要写书评

暂无评论

Detecting and monitoring of water inrush in tunnels and coal mines using direct current resistivity method:A review

引用

Journal of Rock Mechanics and geotechnical engineering 2015年第4期7卷 469-478页

作者： Shucai Li Bin Liu Lichao Nie Zhengyu Liu Mingzhen Tian Shirui Wang Maoxin Su Qian Guo Geotechnical and Structural Engineering Research Center Shandong University

Detecting, real-time monitoring and early warning of underground water-bearing structures are critically important issues in prevention and mitigation of water inrush hazards in underground engineering. Direct current （DC） resistivity method is a widely used method for routine detection, advanced detection and real-time monitoring of water-bearing structures, due to its high sensitivity to groundwater. In this study, the DC resistivity method applied to underground engineering is reviewed and discussed, including the observation mode, multiple inversions, and real-time monitoring. It is shown that a priori information constrained inversion is desirable to reduce the non-uniqueness of inversion, with which the accuracy of detection can be significantly improved. The focused resistivity method is prospective for advanced detection;with this method, the flanking interference can be reduced and the detection dis-tance is increased subsequently. The time-lapse resistivity inversion method is suitable for the regions with continuous conductivity changes, and it can be used to monitor water inrush in those regions. Based on above-mentioned features of various methods in terms of benefits and limitations, we propose a three-dimensional （3D） induced polarization method characterized with multi-electrode array, and introduce it into tunnels and mines combining with real-time monitoring with time-lapse inversion and cross-hole resistivity method. At last, the prospective applications of DC resistivity method are discussed as follows：（1） available advanced detection technology and instrument in tunnel excavated by tunnel boring machine （TBM）, （2） high-resolution detection method in holes, （3） four-dimensional （4D） monitoring technology for water inrush sources, and （4） estimation of water volume in water-bearing structures.

关键词： Direct current （DC） resistivity methodTechnical statusLatest progressUnderground engineeringWater inrushRoutine detectionAdvanced detectionReal-time monitoring

来源：评论

学校读者我要写书评

暂无评论

Technological developments of amphibious aircraft designs: research milestone and current achievement

引用

Curved and Layered Structures 2025年第1期12卷

作者： Putra, Ebenhaezer Candela Kristiawan Suryanto, Muhammad Ramadhani Suryanto, Suryanto Adiputra, Ristiyanto Prabowo, Aditya Rio Puryantini, Navik Carvalho, Hermes Jurkovič, Martin Imanullah, Fahmi Department of Mechanical Engineering Universitas Sebelas Maret Surakarta Indonesia Laboratory of Design and Computational Mechanics Faculty of Engineering Universitas Sebelas Maret Surakarta Indonesia Research Center for Hydrodynamics Technology National Research and Innovation Agency (BRIN) Surabaya Indonesia Department of Structural Engineering Federal University of Minas Gerais Minas Gerais Belo Horizonte Brazil Department of Structural Engineering and Geotechnical University of São Paulo São Paulo Brazil Faculty of Operation and Economics of Transport and Communication University of Žilina Žilina Slovakia China Shipbuilding Industry Corporation Economic Research Center Beijing China

This study aims to examine the development of research on seaplanes and determine the innovations that have been achieved or researched. To better serve the demands of real aircraft designers, this research presented a new process for creating seaplane designs. Combining historical seaplane data with current ship and aircraft design data resulted in a new preliminary seaplane concept design. Another benefit of this design approach is transforming an existing landplane into a seaplane by adding a floating device that satisfies seaplane conversion standards. Enhancing hydrodynamic performance was the addition of a trimaran design. A retractable float device was employed to add drag reduction during flying. The trimaran idea provided superior hydrostatic stability and increased water speed, while the floats’ retractable design decreased aerodynamic drag for improved flying performance. A computational design framework is also created to assess the efficacy and performance of hydrofoils for amphibious aircraft, with a particular emphasis on water take-off performance. For validation, a comparison is made between the numerical simulations and the experiment results. The results of this study show that seaplane research over the past decade has produced several innovations, from general to detailed designs. Seaplane also has the potential to be developed in the coming years. © 2025 the author(s), published by De Gruyter.

关键词： amphibious aircraft computational fluid dynamics optimization takeoff and landing performance trimaran hydrofoils

来源：评论

学校读者我要写书评

暂无评论

An unresolved DEM-CFD based simulation method for the erosion failure process of filling medium in faults

引用

engineering Analysis with Boundary Elements 2025年 178卷

作者： Bai, Songsong Zhou, Zongqing Wang, Meixia Gao, Chenglu Sun, Jiwei Jin, Gaohan Tao, Guangzhe School of Qilu Transportation Shandong University Jinan250061 China Research Institute of New Material and Intelligent Equipment Shandong University Dezhou251114 China Geotechnical and Structural Engineering Research Center Shandong University Jinan250061 China Shandong Hi-Speed Construction Management Group Co. LTD Jinan250001 China

The study of the erosion process of filling medium is the key to uncovering the mechanism of water inrush in fault fracture zones. This study established a simulation method based on the unresolved DEM-CFD framework, considering the bonding strength and porosity variation caused by the clay loss in the filling medium. The accuracy of the simulation method was verified by comparing laboratory test results. Subsequently, five numerical experiments were conducted on the seepage of the filling medium under different hydraulic gradients. The experimental results indicate that the erosion process of the filling medium can be divided into four or three stages(Initial stage, slow erosion stage, accelerated loss stage, and decelerated loss stage). The slow erosion stage disappears while the seepage pressure is relatively high. The fast loss channel for filling medium during the erosion process is located on the model's right side to the outlet's center. This study is essential and valuable for understanding the disaster mechanism of filling media of fault zones under the action of groundwater. © 2025

关键词： Cracks

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：