济南济泺路穿黄隧道典型粉质黏土HSS模型参数获取及适用性  

Parameters Acquisition and Applicability of HSS Model for Typical Silty Clay in Passing under the Yellow River Jiluo Road Tunnel,Jinan City

作　　者：杨州 孙文昊[2] 张亮亮[2] 李亚楠 傅金阳[1] 孙前辉 YANG Zhou;SUN Wen-hao;ZHANG Liang-liang;LI Ya-nan;FU Jin-yang;SUN Qian-hui(School of Civil Engineering,Central South University,Changsha 410075,China;China Railway Siyuan Survey and Design Group Co.,Ltd.,Wuhan 430063,China;Yellow River Engineering Consulting Co.,Ltd.,Zhengzhou 450003,China)

机构地区：[1]中南大学土木工程学院,长沙410075 [2]中铁第四勘察设计院集团有限公司,武汉430063 [3]黄河勘测规划设计研究院有限公司,郑州450003

出　　处：《科学技术与工程》2024年第17期7260-7268,共9页Science Technology and Engineering

基　　金：国家自然科学基金(52078496,52378423)。

摘　　要：盾构施工过程中土体大部分区域处于小应变状态,与常用的本构模型的土体性质有所不同。因此,为研究济南济泺路穿黄隧道区域内典型粉质黏土的的静动力行为特性及工程适用性,通过室内基础土工试验、侧限固结试验、标准三轴固结试验以及动三轴试验,确定了粉质黏土基本物理性质参数以及切线刚度E_(oed)^(ref)、割线模量E_(50)^(ref)、卸载/重加载参考刚度E_(ur)^(ref),并将所得参数应用于济南济泺路穿黄隧道工程下穿北岸大堤沉降分析中,同时通过对比应用硬化土小应变硬化(hardening soil model with small strain stiffness,HSS)本构模型、摩尔库伦(M-C)本构模型的模拟结果与现场实测结果,验证了HSS本构模型在该地区变形分析中的准确性。结果表明:围压一定时,该地区粉质黏土试样竖向应变以塑性应变为主,且随动应力的增加,土体达到稳定所需时间越长;循环荷载一定时,增大土体围压可提高土体的稳定性;基于室内试验获取的HSS本构模型参数模拟的济南济泺路穿黄隧道下穿大堤工程地层变形结果与现场实测值吻合良好,验证了基于所提出的室内试验获取岩土小应变相关参数方法的适用性。研究成果可以丰富济南黄河地区粉质黏土地层参数研究,并为该地区岩土工程数值模拟分析的本构模型与地层参数选取提供参考。The soil is in a small strain state in most areas during the shield construction process,which is different from the soil properties of the commonly used intrinsic model.Therefore,in order to study the static-dynamic behaviour and engineering applicability of typical silty clay in the area of Jinan Jinluo Road Tunnel passing under Yellow River,the basic physical property parameters of silty clay and tangential stiffness E_(oed)^(ref),natural stiffness E_(50)^(ref),unloading/reloading reference stiffness E_(ur)^(ref)were determined by laboratory soil tests,confined consolidation tests,standard triaxial consolidation tests,and dynamic triaxial tests.Then the obtained parameters were applied in the settlement analysis of the north bank embankment under the tunnel project of Jinan Tunnel through Yellow River.The obtained parameters were applied to the settlement analysis of the Jinan Jinluo Road Tunnel Project passing under the north bank embankment,and the accuracy of the HSS principal model in the deformation analysis of the area was verified by comparing the simulation results of the hardening soil model with small strain stiffness(HSS) model and the Mohr-Coulomb(M-C) model with the field measurement results.The results show that when the perimeter pressure is certain,the vertical strain of the silty clay specimens in this area is dominated by plastic strain,and with the increase of dynamic stress,the longer time is needed for the soil to reach the stability.When the cyclic load is certain,increasing the perimeter pressure of the soil could improve the stability of the soil.The deformation of the ground layer of the Jinan Jinluo Road Tunnel through the Yellow River Tunnel Project passing under the embankment,which is simulated based on the parameters of the HSS model obtained from laboratory experiments,is in good agreement with the measured values in the field.The research results could enrich the study of the stratigraphic parameters of silty clay in Jinan Yellow River area,and provide reference for the selectio

关 键 词：粉质黏土 HSS模型 室内试验 适用性 

分 类 号：TU192[建筑科学—建筑理论]