Design of micropiles to increase earth slopes stability
来源期刊：中南大学学报(英文版)2013年第5期
论文作者：sun shu-wei(孙书伟) wang Jia-chen(王家臣) BIAN Xiao-lin(卞晓琳)
文章页码：1361 - 1367
Key words：micropiles; earth slope stabilization; lateral response analysis; design method; P-y curve
Abstract: 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.
sun shu-wei(孙书伟)1, wang Jia-chen(王家臣)1, BIAN Xiao-lin(卞晓琳)2
(1. Faculty of Resources and Safety Engineering, China University of Mining and Technology (Beijing),
Beijing 100083, China;
2. School of Environment, Tsinghua University, Beijing 100084, Chi)
Abstract: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.
Key words:micropiles; earth slope stabilization; lateral response analysis; design method; P-y curve
