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考虑应力扩散作用的软土变形及沉降分析

发表时间:2012-01-31  浏览量:1654  下载量:508
全部作者: 赵燕茹,张永兴,彭禹铭
作者单位: 重庆大学土木工程学院;林同棪国际工程咨询(中国)有限公司
摘 要: 为解决考虑应力扩散效应的上硬下软浅层双层地基应力应变和沉降计算问题,根据土体极限平衡理论,推导出考虑应力扩散效应的双层地基临塑荷载新公式P′cr,以及基于地基临塑荷载的切线模量修正系数R′f. 根据载荷试验能够真实地反映在一定深度范围内土体受力的特性,通过实测P-S曲线得到相应的P-ε应力应变关系图,发现曲线为一双曲线模型,因此根据双曲线的特性,推导出不同深度处原状土的切线模量,并采用考虑应力扩散作用下的修正系数对其进行修正,得到理论修正切线模量,并应用到上硬下软浅层双层地基的最终沉降计算中。通过计算结果的对比和实际工程的验证,发现计算曲线和实测曲线吻合较好,能够计算出更好的结果,同时也弥补了现有理论的不足,为考虑应力扩散效应的双层地基土体应力应变分析和沉降提供新的计算途径。
关 键 词: 岩土工程;应力扩散;应力应变分析;临塑荷载;修正切线模量;沉降计算
Title: Analysis on deformation and settlement of soft soil involving stress dispersion
Author: ZHAO Yanru, ZHANG Yongxing, PENG Yuming
Organization: College of Civil Engineering, Chongqing University; TYLIN International Engineering Consulting (China) Co., Ltd.
Abstract: In order to solve the problems of the stress-strain and settlement calculation of the superficial double-layered foundation, which involve the stress dispersion effect, a new equation of critical edge pressure P′cr is constructed according to the theory of critical equilibrium of soil, and by which the correction coefficient of tangent modulus R′f is also constructed. The in-situ loading test data could reflect the real mechanical situation of soil in a certain depth range. The P-ε curve of the stress and strain is built from the in-situ loading test P-S curve, and which is found to be a hyperbola model. On the basis of the hyperbola model's characteristics, the tangent modulus of undisturbed soil at different depth is constructed, and it is corrected by the correction coefficient R′f which has been deduced by the critical edge pressure of foundation. And the final correctional tangent modulus is calculated too, which is applied to the ultimate settlement calculation of the superficial double-layered foundation. By the comparison of the calculated results and the verification of the actual application, it is found that the new method of ultimate settlement calculation could not only make up the defect of current experiment theory, but also could get a more precise result. The new method is also proved to be a reliable way to analyze the stress-strain and compute the settlement of the double layered foundation.
Key words: geotechnical engineering; stress dispersion; stress and strain analysis; critical edge pressure; correctional tangent modulus; settlement calculation
发表期数: 2012年1月第2期
引用格式: 赵燕茹,张永兴,彭禹铭. 考虑应力扩散作用的软土变形及沉降分析[J]. 中国科技论文在线精品论文,2012,5(2):129-136.
 
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