基于损伤耦合演化过程的黏土-结构物界面统计损伤本构模型  

A statistical damage constitutive model for clay-concrete interface based on damage coupling evolution process

作　　者：李怀鑫 晏长根[1] 石玉玲[2] 余柄学 梅颢鹏 LI Huaixin;YAN Changgen;SHI Yuling;YU Bingxue;MEI Haopeng(School of Highway,Chang'an University,Xi'an 710064,China;School of Geological Engineering and Geomatics,Chang'an University,Xi'an 710054,China;Jiangsu Design Institute of Geology for Mineral Resources(the Testing Center of China National Administration of Coal Geology),Xuzhou 221006,China)

机构地区：[1]长安大学公路学院,陕西西安710064 [2]长安大学地质工程与测绘学院,陕西西安710054 [3]江苏地质矿产设计研究院(中国煤炭地质总局检测中心),江苏徐州221006

出　　处：《中南大学学报（自然科学版）》2024年第6期2260-2272,共13页Journal of Central South University:Science and Technology

基　　金：国家自然科学基金资助项目(42077265);甘肃省交通运输厅科技项目(2021-19)。

摘　　要：为了评估粗糙度对土与结构物界面强度特性的影响,首先,开展不同法向应力条件下黏土和不同粗糙度黏土-结构物界面强度的直剪试验,分析了土体剪切面强度和界面强度的相互关系;其次,利用图像处理软件分析黏土-结构物界面的剪切机理,提出了考虑结构物表面粗糙度影响的界面损伤耦合演化过程;第三,引入考虑界面粗糙度影响的等效初始损伤因子,基于连续损伤理论和统计强度理论建立了考虑界面损伤耦合演化过程的黏土-结构物界面统计损伤本构模型;最后,结合室内试验结果验证了模型适用性。研究结果表明:在相同法向应力条件下,界面粗糙度越大,界面强度越接近土体强度;界面强度与结构物表面粗糙度呈幂函数关系增加,其增长速率随结构物表面粗糙度增加而降低;黏土-结构物界面剪切全过程的损伤演化过程可分为等效初始损伤阶段和加载损伤阶段,其中,等效初始损伤阶段受界面粗糙度影响,加载损伤包括受荷损伤和耦合损伤。本文模型所得结果与试验结果的吻合度较高,能较好地反映黏土与结构物界面损伤本构特征。In order to evaluate the influence of roughness on the strength characteristics of soil-structure interface,Firstly,the direct shear test of the interface strength of clay and clay-structure with different roughness under different normal stress conditions was carried out.The relationship between the shear surface strength of soil and the interface strength of different roughness was analyzed.Secondly,the shear mechanism of clay-structure interface was analyzed by image processing software,and the coupling evolution process of interface damage considering the influence of surface roughness of structure was proposed.Thirdly,by introducing the equivalent initial damage factor considering the influence of interface roughness,a statistical damage constitutive model of clay-structure interface considering the coupling evolution process of interface damage was established based on the continuous damage theory and statistical strength theory.Finally,the applicability of the model was verified by the test results.The results show that the greater the interface roughness,the closer the interface strength to the soil strength under the same normal stress conditions.Interface strength increases as a power function of the structural surface roughness,and its growth rate decreases with the increase of the structural surface roughness.The damage evolution process of the whole shear process of the clay-structure interface can be divided into the equivalent initial damage stage and loading damage stage.In the equivalent initial damage stage,the equivalent initial damage stage is affected by the interface roughness,and the loading damage includes load damage and coupling damage.The calculation results of the model fit with the test results better,which can reflect the damage constitutive characteristics of the interface between clay and structure.

关 键 词：土与结构物界面 粗糙度 等效初始损伤因子 损伤耦合演化 统计损伤理论 本构模型 

分 类 号：TU443[建筑科学—岩土工程]