Exploring an eco-friendly approach to improve soil tensile behavior and cracking resistance  

作　　者：Lin Li Chao-Sheng Tang Jin-Jian Xu Yao Wei Zhi-Hao Dong Bo Liu Xi-Ying Zhang Bin Shi 

机构地区：[1]School of Earth Sciences and Engineering,Nanjing University,Nanjing,210023,China [2]School of Civil and Environmental Engineering,Nanyang Technological University,639798,Singapore [3]Qinghai Provincial Key Laboratory of Geology and Environment of Salt Lake,Qinghai Institute of Salt Lakes,Chinese Academy of Sciences,Xining,810008,China

出　　处：《Journal of Rock Mechanics and Geotechnical Engineering》2024年第10期4272-4284,共13页岩石力学与岩土工程学报（英文）

基　　金：supported by the National Natural Science Foundation of China(Grant Nos.41925012,42230710);Key Laboratory Cooperation Special Project of Western Cross Team of Western Light,Chinese Academy of Sciences(Grant No.xbzg-zdsys-202107).

摘　　要：Soil tensile strength is a critical parameter governing the initiation and propagation of tensile cracking.This study proposes an eco-friendly approach to improve the tensile behavior and crack resistance of clayey soils.To validate the feasibility and efficacy of the proposed approach,direct tensile tests were employed to determine the tensile strength of the compacted soil with different W-OH treatment concentrations and water contents.Desiccation tests were also performed to evaluate the effectiveness of W-OH treatment in enhancing soil tensile cracking resistance.During this period,the effects of W-OH treatment concentration and water content on tensile properties,soil suction and microstructure were investigated.The tensile tests reveal that W-OH treatment has a significant impact on the tensile strength and failure mode of the soil,which not only effectively enhances the tensile strength and failure displacement,but also changes the brittle failure behavior into a more ductile quasi-brittle failure behavior.The suction measurements and mercury intrusion porosimetry(MIP)tests show that W-OH treatment can slightly reduce soil suction by affecting skeleton structure and increasing macropores.Combined with the microstructural analysis,it becomes evident that the significant improvement in soil tensile behavior through W-OH treatment is mainly attributed to the W-OH gel's ability to provide additional binding force for bridging and encapsulating the soil particles.Moreover,desiccation tests demonstrate that W-OH treatment can significantly reduce or even inhibit the formation of soil tensile cracking.With the increase of W-OH treatment concentration,the surface crack ratio and total crack length are significantly reduced.This study enhances a fundamental understanding of eco-polymer impacts on soil mechanical properties and provides valuable insight into their potential application for improving soil crack resistance.

关 键 词：Clayey soil Tensile strength Eco-friendly approach Direct tensile test Desiccation cracking Crack resistance 

分 类 号：TU45[建筑科学—岩土工程]