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2021 6th International Seminar on Advances in Materials Science and engineering, ISAMSE 2021

作者： Song, Xugen Du, Genming Wang, Zhiyong Wang, Zhe Zhu, Mengjun Bai, Weiwei Xie, Shumeng Xia, Kaizong Zheng, Gang Cheng, Xuesong Zhen, Jie Feng, Li Wang, Feng Road Traffic Design and Research Institute China Railway Siyuan Survey and Design Group Co. Ltd. Hubei Wuhan430063 China Department of Earth Sciences University of Firenze Firenze50121 Italy State Key Laboratory of Geomechanics and Geotechnical Engineering Institute of Rock and Soil Mechanics Chinese Academy of Sciences Hubei Wuhan430071 China MOE Key Laboratory of Coast Civil Structure Safety Tianjin University Tianjin300072 China The 3rd Engineering Co. Ltd. of China Railway 12th Bureau Group Shanxi Taiyuan030000 China

A large number of Marine soft clay are distributed in the Pearl River Delta region of China. The soft clay features mainly on high water content, high sensitivity, high compressibility, low density, low strength and low perviousness, which dramatically restricts local project construction. These features often cause engineering problems such as subgrade settlement, pavement cracking, house cracking, tilting and insufficient bearing capacity of the foundation. Therefore, analyzing the soft clay engineering properties in this area is of great significance for guiding engineering design and construction. Based on the statistic analysis of a large amount of in-situ exploration and experimental data in the western central urban area of Zhuhai, this paper focuses on the distribution and engineering properties of the deep Marine soft clay. The results suggests that the thickness of soft clay is at a range of 10m~ 55.1m. The average water content of soft clay is as high as 68.05%, the plasticity index is 28.16, the fast shear cohesion is only 4.93 kPa, and the internal friction angle is 3.26°. Statistical analysis of layered soft clay shows that the parameters of soft clay vary greatly in depth. The preconsolidation pressure and unconfined compressive strength increases with depth. The water content, liquid limit, plastic limit and plasticity index increase first and then decrease with depth, and the average values reach the maximum values at the depth of 10m ~ 25m. However, the direct shear strength index is on the contrary, and shows a track of decreasing first and then increasing. The minimum values of cohesion and internal friction angle come out at the depth of 10m-25m, with the values of 4.83kPa and 3.10° respectively. The results of in-situ test can better reflect the true mechanical properties of soft clay. © 2021 Institute of Physics Publishing. All rights reserved.

关键词： Compressive strength

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Settlement of Composite Foundation with Sparse PTC (Pre-stressed Tubular Concrete) Capped-Piles Under Embankment 5th

Settlement of Composite Foundation with Sparse PTC (Pre-stre...

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5th GeoChina International Conference on Civil Infrastructures Confronting Severe Weathers and Climate Changes: From Failure to Sustainability, 2018

作者： Wang, Bruce Zhi-Feng Wang, Ya-Qiong Cheng, Jason Wen-Chieh Department of Geotechnical and Tunnelling Engineering School of Highway Chang’an University Xi’an Shaanxi710064 China Institute of Tunnel and Underground Structure Engineering School of Civil Engineering Xi’an University of Architecture and Technology Xi’an710055 China

ISBN: (纸本)9783319957432

This paper presents an investigation into the settlement of the composite foundation with sparse PTC (pre-stressed tubular concrete) capped-piles under embankment by theory analysis. Based on the assumption that the distribution of skin frictions on PTC capped-piles is simplified as two triangles, a method for calculating the additional stresses of the composite foundation with sparse PTC capped-piles is proposed. By the combination of Mindlin-Geddes’ solution and Boussinesq’s solution, the formula of additional stresses of single PTC capped-pile foundation is derived by considering the radius of influence range. A case history of highway embankment construction conducted in Jiangsu province, which involved installation of sparse PTC capped-piles for soil reinforcement, was briefly introduced and analyzed, and the observed settlements after completion of the embankment construction reached to 428 mm. The proposed method and the layer-wise summation method were adopted to calculate the settlement of the composite foundation with sparse PTC capped-piles. The comparison results indicate that the calculated settlement of the composite foundation have a good agreement with the field data. The analysis results also suggest that, when the diameter of influence range is eight times larger than the diameter of the pile, the additional stress field shows no significant variation with increasing the influence range. © 2019, Springer International Publishing AG, part of Springer Nature.

关键词： Piles

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Numerical study on the seismic response of the underground subway station-surrounding soil mass-ground adjacent building system

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结构与土木工程前沿 2017年第4期11卷 424-435页

作者： Guobo WANG Mingzhi YUAN Xianfeng MA Jun WU Hubei Key Laboratory of Roadway Bridge and Structure Engineering Wuhan University of Technology Wuhan 430070 China The Key Laboratory of Geotechnical and Underground Engineering of the Ministry of Education Tongji University Shanghai 200092 China Department of Geotechnical Engineering Tongji University Shanghai 200092 China School of Urban Railway Transportation Shanghai University of Engineering Science Shanghai 201620 China

Ground buildings constructed above metro station have increased very quickly due to the limited land resources in urban *** this paper,the seismic response of the Underground subway station-Surrounding soil massGround adjacent buildings (USG) system subjected to various seismic loading is studied through numerical *** numerical model is established in terms of the calculation domain,boundary condition,and contact property between soil and structure based on the real *** reciprocal influence between subway station and ground adjacent building,and their effects on the dynamic characteristics of surrounding soil mass are also *** the numerical study,it is found that the impact of underground structure on the dynamic characteristics of the surrounding soil mass depends on its own dimension,and the presence of underground structure has certain impact on the seismic response of ground adjacent *** to the presence of underground structure and ground adjacent building,the vertical acceleration generated by the USG system cannot be *** outcomes of this study can provide references for seismic design of structures in the USG system.

关键词： underground subway station ground adjacent building seismic response

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Geopolymer Mix in Accordance to Design of Experiment (DOE) Method

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IOP Conference Series: Earth and Environmental Science 2020年第1期498卷

作者： H Atan A Z Mohd Ali N H Abd Khalid A Mohamed Faculty of Civil and Built Environment Universiti Tun Hussein Onn Malaysia 86400 Parit Raja Johor Malaysia. Department of Structure and Materials Faculty of Civil Engineering Universiti Teknologi Malaysia 81310 Skudai Johor Malaysia Department of Geotechnical and Transportation Faculty of Civil Engineering Universiti Teknologi Malaysia 81310 Skudai Johor Malaysia

This paper presents an experimental study conducted to assess the capability of using DOE method to achieve particular targeted strength for geopolymer concrete. Targeted strength of 30 MPa, 40 MPa and 60 MPa were used in this study. Cube samples with dimension of 100 mm were used for compressive strength test. Similar DOE method calculation as in normal concrete mix were calculated for all the raw material ratios in geopolymer concrete mix. Parameters such as characteristic strength, standard deviation (s), margin (m), target mean strength (fm), free-water/cement ratio (w/c), slump, relative density of aggregate (SSD), concrete density (D), percentage grading of fine aggregate passing 600 μm sieve, and proportion of fine aggregate were determined according to the respective concrete mix design. However, only characteristic strength, fm and w/c varied in each targeted strength mix design while the other parameters were kept constant. In order to yield geopolymer concrete, the used of cement and water in DOE form were fully substituted with the used of fly ash and alkaline activator respectively. Final strength gained from test result for the respective 30 MPa, 40 MPa and 60 MPa were 74.6 MPa, 84.5 MPa and 97.7 MPa. Therefore, it was noted that geopolymer mix yielded higher strength compared to the targeted strength by using the DOE method calculation.

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Study on engineering Properties of Deep Marine Soft Clay in Guangdong-Hong Kong-Macao Greater Bay Area

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Journal of Physics: Conference Series 2021年第1期2021卷

作者： Xugen Song Genming Du Zhiyong Wang Zhe Wang Mengjun Zhu Weiwei Bai Shumeng Xie Kaizong Xia Gang Zheng Xuesong Cheng Jie Zhen Li Feng Feng Wang Road Traffic Design and Research Institute China Railway Siyuan Survey and Design Group Co. Ltd. Wuhan Hubei 430063 China Department of Earth Sciences University of Firenze Firenze 50121 Italy State Key Laboratory of Geomechanics and Geotechnical Engineering Institute of Rock and Soil Mechanics Chinese Academy of Sciences Wuhan Hubei 430071 China MOE Key Laboratory of Coast Civil Structure Safety Tianjin University Tianjin 300072 China The 3rd Engineering Co. Ltd. of China Railway 12th Bureau Group Taiyuan Shanxi 030000 China

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Numerical study on the seismic response of the underground subway station-surrounding soil mass-ground adjacent building system

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Frontiers of Earth Science 2017年第4期11卷 424-435页

作者： Guobo WANG Mingzhi YUAN Xianfeng MA Jun WU Hubei Key Laboratory of Roadway Bridge and Structure Engineering Wuhan University of Technology Wuhan 430070 China The Key Laboratory of Geotechnical and Underground Engineering of the Ministry of Education Tongii University Shanghai200092 China Department of Geotechnical Engineering Tongii University Shanghai 200092 China School of Urban Railway Transportation Shanghai University of Engineering Science Shanghai 201620 China

Ground buildings constructed above metro station have increased very quickly due to the limited land resources in urban areas. In this paper, the seismic response of the Underground subway station-Surrounding soil mass- Ground adjacent buildings （USG） system subjected to various seismic loading is studied through numerical analysis. The numerical model is established in terms of the calculation domain, boundary condition, and contact property between soil and structure based on the real project. The reciprocal influence between subway station and ground adjacent building, and their effects on the dynamic characteristics of surrounding soil mass are also investigated. Through the numerical study, it is found that the impact of underground structure on the dynamic characteristics of the surrounding soil mass depends on its own dimension, and the presence of underground structure has certain impact on the seismic response of ground adjacent building. Due to the presence of underground structure and ground adjacent building, the vertical acceleration generated by the USG system cannot be ignored. The outcomes of this study can provide references for seismic design of structures in the USG system.

关键词： underground subway station ground adjacent building seismic response

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Discussion: Interaction factor for large pile groups

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Geotechnique Letters 2016年第3期6卷 234-240页

作者： Wang, A.D. Wang, W.D. Huang, M.S. Wu, J.B. Sheil, B.B. McCabe, B.A. Department of Geotechnical Engineering Tongji University Shanghai China Department of Underground Structure and Geotechnical Engineering East China Architecture Design and Research Institute Shanghai China University of Oxford Oxford United Kingdom College of Engineering and Informatics National University of Ireland Galway Ireland

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A case study on zoned excavation of a large foundation pit in proximity to existing tunnels 8th

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8th Asian Young geotechnical Engineers Conference, 8AYGEC 2016

作者： Li, Q. Xu, Z.H. Li, J. Wang, X.J. Department of Underground Structure and Geotechnical Engineering East China Architectural Design and Research Institute Co. Ltd Shanghai China Shanghai Engineering Research Center of Safety Control for Facilities Adjacent to Deep Excavations Shanghai China

ISBN: (纸本)9781138030077

As available ground resource in congested urban areas in Shanghai is scarce, a number of excavations have to be carried out in close proximity to existing tunnels. It is of great concern to not only ensure the safety of excavation itself but also to minimize the adverse excavation-induced influences on adjacent tunnels in services. The performance of a large excavation for a basement covering an area of 23,000 m2 near existing tunnels is presented in this paper. Zoned excavation technique was utilized to construct the foundation pit. The behaviour of the excavation and corresponding tunnel deformations have been investigated based on three-dimensional finite element analyses and extensive field monitoring. Hardening soil model with small-strain stiffness (HSS model) whose parameters were determined and calibrated against comprehensive laboratory tests was *** field monitoring results show that taking advantage of the zoned excavation procedure the lateral wall displacements were smaller along the nearby tunnels than those at other sides. The measured maximum horizontal tunnel movement was found to be 7 mm, which was within acceptable limits. Numerical analyses considering the small strain stiffness of soil give rise to fairly reasonable results as compared with the measured results. © 2016 Taylor & Francis Group, London.

关键词： Excavation

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Analysis of Leakage Paths Induced by Longitudinal Differential Settlement of the Shield-driven Tunneling

Analysis of Leakage Paths Induced by Longitudinal Differenti...

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2016 3rd International Conference on engineering Technology and Application（ICETA 2016）

作者： Yin Liu Hongbo Zhou Shanghai Key Laboratory of Engineering Structure Safety Shanghai Research Institute of Building Sciences Department of Geotechnical Engineering Tongji University

It is a clear simplification to consider the tunnel lining as uniformly *** reality,it is more likely that there are specific leaks,associated with segmental lining *** the case of the in situ concrete linings,construction joints can provide leakage paths,especially accounting for most of the water *** transportation tunnels in saturated soils below water table,different settlements will lead to ring offsets and changes in joint opening near the edges where the gaskets are located and may significantly affect the sealant potential of the *** this paper,taking the metro line No.1 in Shanghai as an example,the development of joint opening and ring offset was set up based on the mechanical model of segment *** on the magnitude of the joint opening or ring offset,the occurring of water leaking into the tunnel through the joint system can be *** analysis not only helps us realize the leakage paths of the segmental linings,but also provides the guidance for waterproof design and protection measures of the shield tunnel.

关键词： leakage paths segment joint joint opening ring offset

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Design and performance of the piled raft foundation for Shanghai World Financial Center 15

Design and performance of the piled raft foundation for Shan...

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15th Asian Regional Conference on Soil Mechanics and geotechnical engineering, ARC 2015

作者： Wang, W.D. Wu, J.B. Li, Q. Department of Underground Structure and Geotechnical Engineering East China Architectural Design and Research Institute Co. Ltd. Shanghai200002 China Shanghai Engineering Research Center of Safety Control for Facilities Adjacent to Deep Excavations Shanghai200002 China

A case history of the piled raft foundation for Shanghai World Financial Center which is a 101-storey, 492 m high building is presented in this paper. To monitor the performance of the piled raft foundation system and to verify the foundation design work, field measurements were carried out on the raft settlements, pile head axial loads, contact pressures of the raft and pore-water pressures underneath the raft during the entire construction period. The measured raft settlements were comparable to the computed results. At six months after topping out, the maximum settlement was 130 mm in the tube area, decreasing to 90 mm at the edges. Axial loads at pile head increased gradually and varied in magnitude from 1000 to 5000 kN, less than the proposed compression capacities of the steel pipe piles. Both contact pressures of the raft and pore-water pressures beneath the raft varied considerably during the initial construction period but changed slightly after the end of construction. Based on the field measurement results, the piled raft foundation design proved to be appropriate.

关键词： Axial loads

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