基于高聚物动模量的两种试验及其外包隧道减震研究  

Two kinds of dynamic modulus tests on polymer and research on its seismic absorption around tunnel

作　　者：马雪[1] 王复明 郭成超 张继春[1] MA Xue;WANG Fuming;GUO Chengchao;ZHANG Jichun(School of Civil Engineering,Southwest Jiaotong University,Chengdu 610031,China;College of Civil Engineering,Sun Yat-sen University,Guangzhou 510275,China;Guangdong Key Laboratory of Oceanic Civil Engineering,Guangzhou 510275,China;Guangdong Research Center for Underground Space Exploitation Technology,Guangzhou 510275,China)

机构地区：[1]西南交通大学土木工程学院,四川成都610031 [2]中山大学土木工程学院,广东广州510275 [3]广东省海洋土木工程重点实验室,广东广州510275 [4]广东省地下空间开发工程技术研究中心,广东广州510275

出　　处：《地震工程与工程振动》2022年第4期191-199,共9页Earthquake Engineering and Engineering Dynamics

基　　金：西藏自治区重点研发与转化计划项目(XZ201801-GB-07)。

摘　　要：为了获得非水反应双组份聚氨酯高聚物(后文简称高聚物)的动模量和其外包盾构隧道时的最优减震密度和厚度,文中通过共振柱试验和无约束共振试验获取此高聚物注浆材料动弹性模量、动剪切模量和阻尼比,并利用得到高聚物动力学参数,采用ABAQUS数值计算软件,建立多个无限边界有限元模型,并考虑17种高聚物外包隧道工况。通过输入不同密度、动弹性模量、泊松比和厚度的高聚物外包层参数,分析高聚物外包隧道的动力响应。由结果可知高聚物外包层能有效的降低衬砌结构的拉应力,具有较好的减震效果,同时给出高聚物外包层的最优密度0.22~0.33 g/cm^(3)和厚度20 cm。试验结果为高聚物外包隧道减震提供依据与参考。In order to obtain dynamic modulus of non-water reacted two-component polymer(NRTCP)and gain an optimum density and thickness of the NRTCP layer around shield tunnel to reduce seismic effect,a resonant column test and an impact resonant test are used to gain dynamic elastic modulus,dynamic shear modulus and damping ratios of NRTCP.Then,finite element models with infinite boundary are built,and 17 kinds of NRTCP with different densities and thicknesses are used in the models to research tensile stress under seismic load.The results show that NRTCP has positive effect on shock absorption.The optimum density(0.22~0.33 g/cm^(3))and thickness(20 cm)of NRTCP used around tunnel for seismic absorption are suggested.

关 键 词：高聚物注浆材料 动模量 共振柱试验 无约束共振试验 外包 减震 

分 类 号：TU43[建筑科学—岩土工程]