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 

机构地区：[1]School of Civil Engineering and Architecture,Guangxi University,Nanning 530004,China [2]State Key Laboratory of Featured Metal Materials and Life-cycle Safety for Composite Structures,Guangxi University,Nanning 530004,China

出　　处：《Journal of Mountain Science》2023年第10期3066-3083,共18页山地科学学报（英文）

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);。

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 study.Herein,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 cycles.The 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 stability.The 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℃,respectively.Using PWC composite protection systems exhibited better thermal storage performance,which could increase the utilization of shallow geothermal resources.Moreover,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,separately.The 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 erosion.The maximum soil erosion of slopes protected by P-PWC and T-PWC systems was 332 and 164 times lower than that of bare slope,respectively.The P-PWC and T-PWC protection systems achieved excellent"anti-seepage and moisture retention"and anti-erosion effects,thus improving the soil and water stability of slopes.These findings can provide important guiding reference for controlling rainwater infiltration and soil erosion in expansive soil slope projects.

关 键 词：Soil and water stability Expansive soil slope Polymer waterproof coating Model test Soil erosion 

分 类 号：TU443[建筑科学—岩土工程]