Fractional derivative statistical damage model of unsaturated expansive soil based on unified hydraulic effect

作     者：ZHANG Hua WANG Peng ZHANG Hua;WANG Peng

作者机构：School of Architecture and Civil EngineeringChengdu UniversityChengdu 610106China Sichuan Provincial Engineering Research Center of City Solid Waste Energy and Building Materials Conversion and Utilization TechnologyChengdu UniversityChengdu 610106China Geotechnical Engineering InstituteSichuan Institute of Building ResearchChengdu 610081China Sichuan Engineering Research Center for Mechanical Properties and Engineering Technology of Unsaturated SoilsChengdu UniversityChengdu 610106China 

出 版 物：《山地科学学报(英文)》 (Journal of Mountain Science)

年 卷 期：2023年第20卷第9期

页      面：2769-2782页

核心收录：

学科分类：0709[理学-地质学] 0819[工学-矿业工程] 08[工学] 0303[法学-社会学] 081401[工学-岩土工程] 0818[工学-地质资源与地质工程] 0708[理学-地球物理学] 0705[理学-地理学] 0815[工学-水利工程] 0816[工学-测绘科学与技术] 0706[理学-大气科学] 0813[工学-建筑学] 0704[理学-天文学] 0814[工学-土木工程] 0833[工学-城乡规划学] 0713[理学-生态学] 0834[工学-风景园林学（可授工学、农学学位）] 

基　　金：financially supported by Sichuan Huaxi Group Co.,ltd.(No.HXKX2019/015,No.HXKX2019/019,No.HXKX2018/030) the Open Fund of Sichuan Provincial Engineering Research Center of City Solid Waste Energy and Building Materials Conversion and Utilization Technology(No.GF2022ZC009) the Open Fund of Sichuan Engineering Research Center for Mechanical Properties and Engineering Technology of Unsaturated Soils(No.SC-FBHT2022-04) 

主　　题：Unsaturated expansive soil Unified hydraulic effect Shear strength theory Hardening-damage model Fractional derivative 

摘      要：Unsaturated expansive soil is widely distributed in China and has complex engineering *** paper proposes the unified hydraulic effect shear strength theory of unsaturated expansive soil based on the effective stress principle,swelling force principle,and soil–water *** the viscoelasticity and structural damage of unsaturated expansive soil during loading,a fractional hardening–damage model of unsaturated expansive soil was *** model parameters were established on the basis of the proposed calculation method of shear strength and the triaxial shear experiment on unsaturated expansive *** proposed model was verified by the experimental data and a traditional damage *** proposed model can satisfactorily describe the entire process of the strain-hardening law of unsaturated expansive ***,by investigating the damage variables of the proposed model,it was found that:(a)when the values of confining pressure and matric suction are close,the coupling of confining pressure and matric suction contributes more to the shear strength;(b)there is a damage threshold for unsaturated expansive soil,and is mainly reflected by strength criterion of infinitesimal body;(c)the strain hardening law of unsaturated expansive soil is mainly reflected by fractional derivative operator.