Design of micropiles to increase earth slopes stability  

作　　者：孙书伟 王家臣 卞晓琳 

机构地区：[1]Faculty of Resources and Safety Engineering,China University of Mining and Technology(Beijing) [2]School of Environment,Tsinghua University

出　　处：《Journal of Central South University》2013年第5期1361-1367,共7页中南大学学报（英文版）

基　　金：Projects(51034005,41002090) supported by National Natural Science Foundation of China;Project(2011QZ05) supported by the Fundamental Research Funds for the Central Universities,China

摘　　要：A methodology was proposed for the design of micropiles to increase earth slopes stability. An analytic model based on bearn-colurnn equation and an existing P-y curve method was set up and used to find the shear capacity of the micropile. Then, a step-by-step design procedure for stabilization of earth slope with rnicropiles was introduced, involving six main steps： 1） Choosing a location for the rnicropiles within the existing slope; 2） Selecting micropile cross section; 3） Estimating length of rnicropile; 4） Evaluating shear capacity of mieropiles; 5） Calculating spacing required to provide force to stabilize the slope; 6） Designing the concrete cap beam. The application of the method to an embankment landslide in Qinghai Province was described in detail. In the final design, three rows of rnicropiles were adopted as a group and a total of 126 rnicropiles with 0.23 m in diameter were used. The micropile length ranged between 15 and 18 m, with the spacing 1.5 m at in-row direction. The monitoring data indicate that slope movement has been effectively controlled as a result of the slope stabilization measure, which verifies the reasonability of the design method.A methodology was proposed for the design of micropiles to increase earth slopes stability. An analytic model based on beam-column equation and an existing P y curve method was set up and used to find the shear capacity of the micropile. Then, a step-by-step design procedure for stabilization of earth slope with micropiles was introduced, involving six main steps: 1) Choosing a location for the micropiles within the existing slope; 2) Selecting micropile cross section; 3) Estimating length of micropile; 4) Evaluating shear capacity of micropiles; 5) Calculating spacing required to provide force to stabilize the slope; 6) Designing the concrete cap beam. The application of the method to an embankment landslide in Qinghai Province was described in detail. In the final design, three rows of micropiles were adopted as a group and a total of 126 micropiles with 0.23 m in diameter were used. The micropile length ranged between 15 and 18 m, with the spacing 1.5 m at in-row direction. The monitoring data indicate that slope movement has been effectively controlled as a result of the slope stabilization measure, which verifies the reasonability of the design method.

关 键 词：micropiles earth slope stabilization lateral response analysis design method P-y curve 

分 类 号：TU473.1[建筑科学—结构工程]