摘要
地基的沉降量计算一直是地基基础工程中的重点问题,在地基基础设计过程中地基沉降量是重要的建筑变形控制参数,在满足地基承载力要求的前提下,只要将地基的沉降控制在允许变形的范围内,就能达到更好的经济效益,因此地基沉降量的准确计算对地基基础工程至关重要。地基沉降量的计算不仅与地基土层的物理力学性质、强度参数、变形指标有关,还与基础的尺寸有关,本文在原位载荷试验p-s曲线符合双曲线的基本假定条件下,采用切线模量法反算地基土层的切线模量和强度指标黏聚力,得到地基土层的变形和强度指标参数后,再用平均切线模量法计算实际基础的p-s曲线,进而确定实际基础的地基沉降量。文中通过CFG桩复合地基原位载荷试验及地基沉降量计算案例对切线模量法计算地基沉降量进行了优化,并与现行规范中地基沉降量计算方法进行了比较说明,验证了该计算方法的合理性。
The calculation of foundation settlement has always been a key issue in foundation engineering.During the process of foundation design,the settlement of foundation serves as a significant parameter for controlling structural deformation.Under the requirements for bearing capacity of foundation,controlling the settlement within the allowable deformation range can lead to improved economic benefits.Therefore,the accurate calculation of foundation settlement is crucial to the foundation engineering.The calculation of foundation settlement not only depends on the physical and mechanical properties,strength parameters and deformation index of the foundation soil,but also depends on the size of the foundation.In this work,assuming that the p-s curve obtained from the in-situ loading test adheres to a hyperbolic shape,the tangent modulus method is employed to calculate the tangent modulus and the strength index cohesion of the foundation soil layer.This enables the determination of deformation and strength parameters for the foundation soil layer.Subsequently,the average tangent modulus method is utilized to calculate the p-s curve for the actual foundation and its settlement.This study optimizes the calculation of foundation settlement using the tangent modulus method by conducting in-situ loading tests on CFG pile composite foundations and comparing the results with the calculation method of current code.This comparison serves to validate the rationality of the proposed calculation approach.
作者
马健
MA Jian(Beijing Huan'an Engineering Inspection&Test Co.,Ltd.,Beijing 100020,China)
出处
《地基处理》
2024年第1期31-37,共7页
Journal of Ground Improvement
关键词
沉降量计算
切线模量
原位载荷试验
CFG桩复合地基
地基承载力
settlement calculation
tangent modulus
in-situ loading test
CFG pile composite foundation
foundation bearing capacity
