摘要
国家重点研发计划项目“膨胀土滑坡和工程边坡新型防治技术研究(2019YFC1509800)”基于蒙脱石表面的分形模型,根据等温吸附理论,揭示膨胀土的水力作用机理,建立了膨胀变形理论和广义有效应力理论,提出了裂隙性膨胀土的剪切强度理论;根据膨胀土边坡失稳特征,将膨胀土边坡失稳滑动分为浅层裂隙控制滑坡和深层结构面控制滑坡,针对两种膨胀土滑坡类型,提出了膨胀土边坡安全性评价方法;将膨胀土边坡防治技术分为三类:分“隔”技术、支“挡”技术和加“固”技术(简称“隔”、“挡”、“固”)。分“隔”技术包括非膨胀性黏土盖层、土工编织袋、加筋反包和防排水结构层,支“挡”技术主要为各类挡土墙,如桩板墙、土工编织袋挡墙等,加“固”技术主要包括抗滑桩、锚杆等;提出了土工编织袋、加筋反包和桩板墙防治技术的标准化设计方法,完成了土工编织袋、加筋反包、防排水结构层和桩板墙的应用示范工程,采用现场全自动实时监测技术,验证了膨胀土边坡防护效果。
For the National Key Research and Development Program of China“Research on new prevention and control technology of expansive soil slopes(No.2019YFC1509800)”,the following achievements are obtained:(1)Based on the fractal model for montmorillonite surface and the isothermal adsorption theory,the water-mineral interaction mechanism of expansive soils is revealed,the swelling deformation theory and generalized effective stress theory are established,and the shear strength theory of fractured expansive soils is put forward.(2)The failure mechanism of expansive soil slopes is divided into two types which are controlled by shallow cracks and deep weak planes.The methods to evaluate the stability factor of expansive soil slopes are proposed for two slope failure types.(3)The prevention technology of expansive soil slopes is divided into three types as"separation"technology,"retaining"technology and"stabilization"technology(hereinafter written as SRS for short).The separation technology contains non-expansive clay-covered layer,soil bags,reinforced package and waterproof&drainage layers.The retaining technology contains pile-sheet walls and soilbag retaining walls.The stabilization technology contains anti-slide piles and anchor rods.(4)The standardized design of soilbag,reinforced packages and pile-sheet walls is realized.The application of soil bags,reinforced packages,waterproof&drainage layers and pile-sheet walls are completed for the prevention of expansive soil slopes.The validity of the applied prevention and control technology is checked by the real-time automatic monitoring results in site.
作者
徐永福
程岩
肖杰
林宇亮
戚顺超
XU Yong-fu;CHENG Yan;XIAO Jie;LIN Yu-liang;QI Shun-chao(Department of Civil Engineering,Shanghai Jiao Tong University,Shanghai 200240,China;Changsha University of Science&Technology,Changsha 410114,China;Central South University,Changsha 410083,China;Sichuan University,Chengdu 610065,China)
出处
《岩土工程学报》
EI
CAS
CSCD
北大核心
2022年第7期1281-1294,共14页
Chinese Journal of Geotechnical Engineering
基金
国家重点研发计划项目(2019YFC1509800)。
关键词
膨胀土
工程边坡
滑坡
防治
标准化
expansive soil
engineering slope
slopeslide
prevention and control
standardization
