基于等效线性化方法的膨胀土地震响应分析  

Seismic Response Analysis of Expansive Soil Based on Equivalent Linear Method

作　　者：郑司元 景月岭[1,2] 张宇璇 李明会 宛明晨 马乐乐 ZHENG Si-yuan;JING Yue-ling;ZHANG Yu-xuan;LI Ming-hui;WAN Ming-chen;MA Le-le(School of Civil and Hydraulic Engineering,Hefei University of Technology,Hefei 230009,China;State Key Laboratory of Hydroscience and Engineering,Tsinghua University,Beijing 100084,China)

机构地区：[1]合肥工业大学土木与水利工程学院,安徽合肥230009 [2]清华大学水沙科学与水利水电工程国家重点实验室,北京100084

出　　处：《水电能源科学》2022年第11期133-136,128,共5页Water Resources and Power

基　　金：中央高校基本科研业务费专项资金资助项目(PA2019GDPK0036);清华大学水沙科学与水利水电工程国家重点实验室开放基金项目(sklhse-2020-D-04)。

摘　　要：非线性膨胀土层的地震响应分析是目前研究的难点,而等效线性化方法则是求解该问题的最佳方法之一。为探究膨胀土的地震响应,以南阳地区膨胀土为例,采用修正的Hardin-Drnevich本构模型,利用等效线性化方法,计算不同应力历史、围压、土层厚度条件下膨胀土的加速度反应谱。结果表明,在不同应力历史情况下,反应谱短周期的波峰值是卸载路径最大,加载路径次之,再加载路径最小;围压对加载路径和再加载路径下的短周期波峰值影响较大,对卸载路径下的影响甚微;土层厚度的增加使得反应谱的最大峰值减小,同时出现峰值延迟现象。通过对比波峰值之间的差异,发现土层厚度的影响最为显著,因此应依据场地条件选择合适的土体参数作为膨胀土地区抗震设计依据。The seismic response analysis of nonlinear expansive soil layer is a research focus in earthquake engineering, and the equivalent linear method is one of the best methods to solve this problem. In order to explore the seismic response of expansive soil, taking the expansive soil in Nanyang area as an example, the modified Hardin-Drnevich constitutive model and the equivalent linear method were used to calculate the acceleration spectrum of expansive soil under different stress history, confining pressure and thickness of soil layer. The results show that under different stress histories, the crest value of the short period wave of the response spectrum is the largest in unloading path, followed by the loading path and the smallest in the reloading path;The confining pressure has a great impact on the crest value of short periodic wave under loading path and reloading path, but has little impact on unloading path;The increase of the thickness of soil layer reduces the maximum peak value of response spectrum, and the peak delay occurs. By comparing the differences between wave crests, it is found that the impact of the thickness of soil layer is the most significant. Therefore, appropriate soil parameters should be selected as the basis for seismic design in expansive soil areas according to site conditions.

关 键 词：膨胀土 等效线性化 地震响应分析 应力历史 围压 土层厚度 

分 类 号：TV16[水利工程] TU443[建筑科学—岩土工程]