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以控制桩帽间土体沉降量在工后沉降量标准范围内为目标,提出带帽控沉疏桩复合地基设计的思路和方法。采用调整桩体中心间距或桩帽尺寸等措施,以改变复合桩土应力比来进行带帽控沉疏桩复合地基设计。基于弹性理论和等沉面思想,不考虑复合桩体自身压缩变形量,简化了带帽刚性桩复合地基复合桩土应力比隐式计算公式,得到了按桩帽间土体沉降计算模式进行沉降估算的公式。最后将复合桩土应力比简化计算公式应用于工程实践,计算结果表明该方法具有较好的先进性和适用性。
In order to control the settlement of soil between pile and cap in the standard range of post-construction settlement, the idea and method of design of composite foundation with cap-filled and dewatering pile are proposed. By adjusting the distance between the center of the pile or the size of the pile cap, the design of the composite foundation with the capped sedimentation pile is carried out by changing the stress ratio of composite pile and soil. Based on the theory of elasticity and isoscelesis, the formula of soil stress ratio of composite pile with rigid-capped pile is simplified without considering the compressive deformation of composite pile, and the settlement of soil mass between pile and cap is obtained. Estimated formula. Finally, the simplified calculation formula of composite pile-soil stress ratio is applied to engineering practice. The calculation results show that this method has better advancedness and applicability.