考虑桩土变形协调的软土刚性桩复合地基设计计算

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摘要按照规范设计，软土刚性桩复合地基桩间土的承载力往往被过高使用，其设计承载力对应的沉降大于复合地基沉降，而实际中是不可能出现这种情况，因此，桩间土承载力并不能按照设计发挥，主要原因是没有考虑桩、土变形协调的关系。为揭示桩、土变形协调的内在本质以及软土承载力被过高使用的问题，采用双曲线切线模量法，分别计算桩、土的p-s曲线，然后叠加成复合地基的p-s曲线，建立桩、土变形协调关系，以此分析桩、土荷载分担的情况。分析后发现，按照规范方法设计时，通常软土的承载力使用过高和桩的承载力设计偏低，如单桩承载力或其强度不足，易导致桩及复合地基破坏。针对规范方法的不足，提出合理的软土刚性桩复合地基设计应考虑桩、土变形协调的关系，应根据其p-s曲线按照相应沉降量所对应的荷载确定桩间土承载力，建立的考虑桩、土变形协调的软土刚性桩复合地基设计计算方法，可为今后设计提供指导作用。

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关键词 ：土力学, 复合地基, 软土, 刚性桩, 变形协调, 切线模量法, 沉降控制

Abstract：According to design specification，soft soil rigid pile composite bearing capacity of soil between piles are often use too high，the settlement of soft soil under the corresponding designed load is greater than the settlement of composite foundation. But this situation can not happen in reality. So the bearing capacity of soft soil is not fully functional as designed load in engineering practice. The main reason is not considered the pile-soil deformation compatibility. In order to reveal the intrinsic relationship between the deformation compatibility and bearing capacity of soft soil being used much higher than the reality，the p-s curve of the pile and soil respectively is calculated by the tangent modulus method. Then，the rigid-pile composite foundation?s p-s curve is determined by the p-s curves of the pile and soil. The relationship of the deformation compatibility of pile-soil will be established，on the basis of which the load-sharing case of the pile and soil can be analysed. It is found that the designed bearing capacity of soil is much higher than the reality based on normal design norms of composite foundation，while pile load is greater than the designed value. The bearing capacity or strength of pile is inadequate，which leads to foundation failure. For the lack of design norms methods，it was put forward that rational design of composite foundation should consider the deformation compatibility and bearing capacity of soft soil should be determined under corresponding the settlement in terms of its p-s curve. It is established the designed calculation of rigid-pile composite foundation in soft soil ground considering deformation compatibility of pile-soil. It provides a guide for design in the future.

Key words： soil mechanics composite foundation soft soil rigid-pile deformation compatibility tangent modulus method settlement control

收稿日期: 2011-05-20

引用本文:

刘鹏1，2，杨光华1，3. 考虑桩土变形协调的软土刚性桩复合地基设计计算[J]. 岩石力学与工程学报, 2011, 30(S2): 4039-4046.
LIU Peng1，2，YANG Guanghua1，3. DESIGNED CALCULATION OF RIGID-PILE COMPOSITE FOUNDATION IN SOFT SOIL GROUND CONSIDERING DEFORMATION COMPATIBILITY OF PILE AND SOIL. , 2011, 30(S2): 4039-4046.

链接本文:

http://www.rockmech.org/CN/Y2011/V30/IS2/4039

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