东篱科研大数据发现系统（DRDS）

位置：成果数据库 > 期刊 > 期刊详情页

应力路径对饱和软黏土割线模量的影响

ISSN号：1000-7598
期刊名称：《岩土力学》
时间：0
分类：TU431[建筑科学—岩土工程;建筑科学—土工工程]
作者机构：[1]温州大学建筑与土木工程学院,浙江温州325035, [2]浙江大学软弱土与环境土工教育部重点实验室,杭州310027, [3]温州职业技术学院建筑工程系,浙江温州325035
相关基金：国家自然科学基金项目（No.51308420,No.51278383,No.51238009,No.51025827,No.50979096）;国家重点基础研究发展计划资助（No.2011CB411907）.

关键词：软黏土, 应力-应变关系, 应力路径, 割线模量, clay, stress-strain relationships, stress path, secant modulus

中文摘要：

在基坑、隧道开挖等过程中，不同部位的土体会经历不同的应力路径，在不同的应力路径下，土体可能表现出截然不同的静力学特性。同时，在工程实际中，土体的工作应变经常处于小应变范围，而在小应变情况下，土体的静力特性表现出更强的非线性和应力路径依赖性。基于广泛分布于东部地区，并且表现出诸多不良工程特性的软黏土，进行一系列不排水和排水条件下的应力路径静力试验，以研究应力路径对饱和软黏土静力特性，尤其是小应变情况下割线模量的影响。试验结果表明，不管在不排水还是在排水条件下，应力路径都对饱和软黏土的静强度产生巨大的影响，表现为围压增加的加载应力路径增大了静强度，而围压减小的卸载应力路径降低了静强度。同时，应力路径对割线弹性模量产生了更大的影响，围压增加的加载应力路径降低了割线模量，而围压减小的卸载应力路径增大了割线模量。应力路径对割线模量的影响在小应变时表现的更加明显，而这种影响主要原因是应力路径方向改变造成的土体各向异性。

英文摘要：

In the process of deep excavation and tunnel design, soils of different sites may undergo different static stress paths. Under different stress paths, soils may behave different static characteristics. At the same time, in engineering practice, the work strain of soils is in the range of small strain; and in the range of small strain, the static characteristics of soils behave more nonlinear and depending the stress paths. In this paper, based on the soft clays which spread widely in the Eastern China and behave many bad engineering properties, a series of static stress paths tests were conducted under undrained condition and drained condition. Test results show that： under both undrained and drained conditions, the stress paths make great influences on the static strength; the stress paths with increasing confining pressure increase the static strength; while the stress paths with decreasing confining pressure decrease the static strength. Meanwhile, the stress paths make greater influences on the degradation of secant Young＇s modulus; the stress paths with increasing confining pressure decrease the secant modulus; while the stress paths with decreasing confining pressure increase the secant modulus. The influence of stress paths on the secant modulus is more significant in the range of small strain; and it is due to the anisotropy induced by the change of stress path directions.

同期刊论文项目