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高层建筑桩、筏基础共同作用沉降分析计算
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作者 赖琼华 《广州建筑》 2009年第5期31-33,共3页
某高层建筑场地基岩裂隙发育,软弱夹层分布复杂,强风化、中风化、微风化岩带交互叠夹,通过基础的优化设计,最终确定基础采用桩、筏共同作用的混合型基础形式,解决了基础设计的难题,采用非均质地基刚性基础的变形计算方法计算的楼房沉降... 某高层建筑场地基岩裂隙发育,软弱夹层分布复杂,强风化、中风化、微风化岩带交互叠夹,通过基础的优化设计,最终确定基础采用桩、筏共同作用的混合型基础形式,解决了基础设计的难题,采用非均质地基刚性基础的变形计算方法计算的楼房沉降值与实测沉降很接近。 展开更多
关键词 桩、筏基础 岩土力学 岩土变形模量 基础持力层
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3D finite elements analysis of vertically loaded composite piled raft 被引量:8
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作者 Reza Ziaie Moayed Ehsan Izadi Mehrad Mirsepahi 《Journal of Central South University》 SCIE EI CAS 2013年第6期1713-1723,共11页
In recent years,a new type of foundation named composite piled raft foundation (also called long short composite piled raft) has been developed.Where designing shallow foundations would mean unacceptable settlement,or... In recent years,a new type of foundation named composite piled raft foundation (also called long short composite piled raft) has been developed.Where designing shallow foundations would mean unacceptable settlement,or other environmental risks exist which could impair the structure in the future,composite piled raft foundations could be used.Finite element method was applied to study the behavior of this type of foundation subjected to vertical loading.In order to determine an optimal pile arrangement pattern which yields the minimum settlement,various pile arrangements under different vertical stress levels were investigated.Results show that with increasing the vertical stress on the raft,the effectiveness of the arrangements of short and long piles become more visible.In addition,a new factor named "composite piled raft efficiency" (CPRE) has been defined which determines the efficiency of long short piles arrangement in a composite piled raft foundation.This factor will increase when short piles take more axial stresses and long piles take less axial stresses.In addition,it is found that the changes in settlements for different long short piles arrangement are in a well agreement with changes in values of CPRE ratio.Thus,CPRE ratio can be used as a factor to determine the efficiency of piles arrangements in composite piled raft foundation from the view point of reducing raft settlements. 展开更多
关键词 composite piled raft SETTLEMENT composite piled raft efficiency long-short pile arrangement CUSHION
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Model test on vertical bearing capacity of X-section concrete pile raft foundation in silica sand 被引量:3
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作者 XU Lai PENG Yu +1 位作者 DING Xuan-ming LIU Jia-yi 《Journal of Central South University》 SCIE EI CAS CSCD 2020年第6期1861-1869,共9页
To reveal the bearing capacity of the X-section concrete piles pile raft foundation in silica sand,a series of vertical load tests are carried out.The X-section concrete piles are compared with circular section pile w... To reveal the bearing capacity of the X-section concrete piles pile raft foundation in silica sand,a series of vertical load tests are carried out.The X-section concrete piles are compared with circular section pile with the same section area.The load−settlement curves,axial force and skin friction,strain on concave and convex edge of the pile,pile-sand stress ratio,distributions of side and tip resistance are presented.The results show that bearing capacity of the X section concrete pile raft foundation is much larger than that of the circular pile raft foundation.Besides,compared with the circular pile,the peak axial force of X-section piles under raft is deeper and smaller while the neutral point of X-section concrete pile is deeper.Moreover,the strain on the concave edge is much larger than that on the convex edge of the pile,and the convex edge has more potential in bearing capacity as the vertical load increases.The X-section pile has higher pile-sand stress ratios and load-sharing between side resistance and tip resistance.Above all,the X-section concrete pile can significantly increase the bearing capacity of pile-raft foundations in silica sand. 展开更多
关键词 X-section pile pile raft foundation model test neutral point pile-soil stress ratio
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Settlement calculation for long-short composite piled raft foundation 被引量:4
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作者 赵明华 张玲 杨明辉 《Journal of Central South University of Technology》 EI 2006年第6期749-754,共6页
The mechanism of long-short composite piled raft foundation was discussed. Assuming the relationship between shear stress and shear strain of the surrounding soil was elasto-plastic, shear displacement method was empl... The mechanism of long-short composite piled raft foundation was discussed. Assuming the relationship between shear stress and shear strain of the surrounding soil was elasto-plastic, shear displacement method was employed to establish the different explicit relational equations between the load and the displacement at the top of pile in either elastic or elasto-plastic period. Then Mylonakis & Gazetas model was introduced to simulate the interaction between two piles or between piles and soil. Considering the effect of cushion, the flexible coefficients of interaction were provided, With the addition of a relevant program, the settlement calculation for long-short composite piled raft foundation was developed which could be used to account for the interaction of piles, soil and cushion. Finally, the calculation method was used to analyze an engineering example. The calculated value of settlement is 10.2 ram, which is close to the observed value 8.8 mm. 展开更多
关键词 long-short composite oiled raft foundation shear displacement method SETTLEMENT Mylonakis Gazetas model
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Spring constitutive model of rigid pile composite foundation and application in design of raft foundation 被引量:1
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作者 韩小雷 肖成安 +1 位作者 李稼轩 冯杰强 《Journal of Central South University》 SCIE EI CAS 2013年第4期1079-1084,共6页
The simplified analysis method based on the static equilibrium is generally adopted for raft design. The secondary stress of superstructure due to the differential settlement of the foundation is neglected, which lead... The simplified analysis method based on the static equilibrium is generally adopted for raft design. The secondary stress of superstructure due to the differential settlement of the foundation is neglected, which leads to larger support moments and longitudinal bending of raft compared with real values. The spring constitutive relation of composite foundation is obtained by the flat plate loading tests in Karst region. The interaction between the spring and the raft is equivalent to the interaction between the composite foundation and the raft. The model for superstructure-raft-composite foundation interaction analysis is thus established and the raft is designed. This method not only considers the nonlinear properties of composite foundation but also analyzes the influence of superstructure on bending moment and deformation of raft. Compared with the inverted floor method, the calculated values of moment become more reasonable and uneven settlements are considered. This can be references to the design of raft foundation in similar regions. 展开更多
关键词 spring constitutive relation composite foundation RAFT INTERACTION
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