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2004安全科学与技术国际会议

作者： HU Chunlin1 2 LI Kun2 HU Shenggang2 & YANG Zhiyong2 (1 Shanghai Institute of Applied Mathematics and Mechanics Shanghai University Shanghai 200072 China) (2 College of Civil Engineering and Architecture Wuhan University of Technology Wuhan 430070 Hubei China)

It is synthetically analyzed about the safety monitoring methods and monitoring results of the stress and strain of the main steel of the raft, deformations of the raft, soil pressures under the raft,

关键词： raft foundation safety monitoring sloping bedrock synthetical analysis

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Centrifuge modeling of a large-scale surcharge on adjacent foundation

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Journal of Rock Mechanics and Geotechnical Engineering 2024年第8期16卷 3181-3191页

作者： Jinzhang Zhang Zhenwei Ye Dongming Zhang Hongwei Huang Shijie Han Tong Zou Le Zhang Key Laboratory of Geotechnical and Underground Engineering of Ministry of Education and Department of Geotechnical Engineering Tongji UniversityShanghai200092China CCCC Third Harbor Consultants Co LtdShanghai200032China Qingdao Conson Jiaozhou Bay Second Subsea Tunnel Co. LtdQingdao266000China

This study investigates the ground and structural response of adjacent raft foundations induced by largescale surcharge by ore in soft soil areas through a 130g centrifuge modeling test with an innovative layered loading *** prototype of the test is a coastal iron ore yard with a natural foundation of deep soft ***,it is necessary to adopt some measures to reduce the influence of the large-scale surcharge on the adjacent raft foundation,such as installing stone columns for foundation *** an acceleration of 130 g,the model conducts similar simulations of iron ore,stone columns,and raft foundation *** tested soil mass has dimensions of 900 mm×700 mm×300 mm(lengthwidthdepth),which is remodeled from the soil extracted from the drilling *** test conditions are consistent with the actual engineering conditions and the effects of four-level loading conditions on the composite foundation of stone columns,unreinforced zone,and raft foundations are *** automatic layer-by-layer loading device was innovatively developed to simulate the loading process of actual engineering more *** composite foundation of stone columns had a large settlement after the loading,forming an obvious settlement trough and causing the surface of the unreinforced zone to *** 12 m surcharge loading causes a horizontal displacement of 13.19 cm and a vertical settlement of 1.37 m in the raft *** stone columns located on both sides of the unreinforced zone suffered significant shear damage at the sand-mud *** to the reinforcement effect of stone columns,the sand layer below the top of the stone columns moves ***,the horizontal earth pressure in the raft foundation zone increases *** stone columns will form new drainage channels and accelerate the dissipation of excess pore pressure.

关键词： Centrifuge modeling Stone column Composite foundation Ground movement raft foundation

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Numerical Study of the Mechanical Behavior of a foundation raft under the Hydrodynamic Influence of the Mechanical Characteristics of Clay Soils

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Engineering（科研） 2020年第10期12卷 766-780页

作者： Tsanga Menounga Hugues Fokwa Didier Nde Martial Ngwem Bahiya Blaise Mechanics Laboratory Doctoral Training Unit in Engineering Sciences Doctoral School of Fundamental and Applied Sciences University of Douala Douala Cameroon Department of Architecture and Urbanism Institute of Fine Arts University of Douala Douala Cameroon Higher Normal School of Technical Education University of Douala Douala Cameroon

The clay soils of the city of Douala are constantly saturated with water, which permanently favors the hydrodynamic behavior of the soils (swelling or consolidation). This phenomenon can cause serious disturbances in the structure of buildings resulting in the appearance of cracks in structures (buildings, road bridge, viaduct, etc.). The foundation raft is a very important structure in the dimensioning of structures. Given the soil-structure interactions, its mechanical characteristics must be the subject of a special study linked to the building environment. In this article, we present a study of the mechanical behavior of a foundation raft anchored in a laminate floor. The aim is to highlight the influence of the mechanical properties of the foundation soil on the evolution of the mechanical behavior of the raft. The method used is a numerical simulation. A physical model taking into account a 5-storey building based in Douala in the Denver district is studied. The foundation on the raft foundation of this building follows an elastic constitutive law with Mazars damage, and rests on a laminated soil of plastic elastic model with Camclay plasticity criterion. The ground-raft and ground-ground interfaces are carried out with the finite elements joined to three nodes (JOI3), and obey the Coulomb model;it is an expansion joint model with Mohr-Coulomb type criterion and associated flow. The numerical resolution is carried out by the finite element method, and the numerical simulations via the Cast3M calculation code. The results from the simulations show that the mechanical characteristics of foundation soils, in this case the water content, the compactness, the state of consolidation, greatly influence the mechanical behavior of the foundation slab. There is indeed a significant settlement and a great deformation of the raft foundation when the water content of the soil layers increases, and when the states of consolidation and compactness are low. This article allow

关键词： raft foundation Water Content Compactness Consolidation Settlement Deformation Numerical Simulation

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foundation Assessment in Different Parts of Iraq Using STAAD Pro V8i

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Journal of Civil Engineering and Architecture 2013年第3期7卷 273-281页

作者： Entidhar A1-Taie Nadhir A1-Ansari Sven Knutsson Tarek Edrees Saaed Department of Civil Environment and Natural Resources Engineering Lulea University of Technology Lulea 97187 Sweden

foundation is considered as one of the main parts of any structure. The type of foundation used is highly dependent on the type and properties of soil. The design of foundations requires many factors that should be defined. There are number of differences in the geological and soil conditions in Iraq. As a consequence, these differences are reflected on the type of foundation to be used. Despite these differences, same materials and style of buildings are used all over Iraq. The main problems of Iraqi soil are high gypsum content, salinity and shallow water table depth. These factors that influence the foundations are the soil properties and the amount of loads that transmitted by the superstructure. The situation has been analysed through a case study which illustrated the link between soil and foundation types in three different parts of Iraq （Mosul, Baghdad and Basra）. One building was analysed using ＂STAAD （structural analysis and design）. Pro＂ software in these regions. It is evident that Iraqi designers and engineers require local code to define all the loads, materials and design of the foundation to be used. The use of local materials might be very effective from both engineering and economic perspectives.

关键词： Gypsum bearing capacity Iraqi soil raft foundation foundation design base pressure

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