Novel protection systems for the improvement in soil and water stability of expansive soil slopes

作     者：MA Shao-kun HE Ben-fu MA Min HUANG Zhen CHEN Sheng-jia YUE Huan MA Shao-kun;HE Ben-fu;MA Min;HUANG Zhen;CHEN Sheng-jia;YUE Huan

作者机构：School of Civil Engineering and ArchitectureGuangxi UniversityNanning 530004China State Key Laboratory of Featured Metal Materials and Life-cycle Safety for Composite StructuresGuangxi UniversityNanning 530004China 

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

年 卷 期：2023年第20卷第10期

页      面：3066-3083页

核心收录：

学科分类：0830[工学-环境科学与工程（可授工学、理学、农学学位）] 081401[工学-岩土工程] 08[工学] 0814[工学-土木工程] 

基　　金：the financial supports from the Key Research and Development Program of Guangxi(No.GUIKE AB22080061) the Guangxi Transportation Industry Key Science and Technology Projects(No.GXJT-2020-02-08) the National Natural Science Foundation of China(No.52268062) the Guangxi Key Project of Nature Science Foundation(No.2020GXNSFDA238024) 

主　　题：Soil and water stability Expansive soil slope Polymer waterproof coating Model test Soil erosion 

摘      要：To improve the soil and water stability of expansive soil slopes and reduce the probability of slope failure,novel protection systems based on polymer waterproof coatings(PWC)were used in this ***,three groups of expansive soil slope model tests were designed to investigate the effects of polyester nonwovens and PWC(P-PWC)composite protection system,three-dimensional vegetation network and PWC(T-PWC)composite protection system,and nonprotection on the soil and water behavior in the slopes under precipitation–evaporation *** results showed that the moisture change of P-PWC and T-PWC composite protected slopes was significantly smaller than that of bare slope,which reduced the sensitivity of slope moisture to environmental changes and improved its *** soil temperature of the slope protected by the P-PWC and T-PWC systems at a depth of 70 cm increased by 5.6℃ and 2.7℃,*** PWC composite protection systems exhibited better thermal storage performance,which could increase the utilization of shallow geothermal ***,the maximum average crack widths of the bare slopes were 7.89 and 3.17 times those of the P-PWC and TPWC protected slopes,respectively,and the maximum average crack depths were 6.87 and 3 times those of the P-PWC and T-PWC protected slopes,*** PPWC protection system weakened the influence of hydro–thermal coupling on the slopes,inhibited the development of cracks on the slopes,and reduced the soil *** maximum soil erosion of slopes protected by P-PWC and T-PWC systems was 332 and 164 times lower than that of bare slope,*** P-PWC and T-PWC protection systems achieved excellentanti-seepage and moisture retentionand anti-erosion effects,thus improving the soil and water stability of *** findings can provide important guiding reference for controlling rainwater infiltration and soil erosion in expansive soil slope projects.