工程地质学报2017，Vol.25Issue(5)：1190-1204,15.DOI:10.13544/j.cnki.jeg.2017.05.003
多剖面合力法分析滑坡稳定性
STABILITY ANALYSIS OF LANDSLIDE USING JOINT FORCES METHOD ON MULTIPLE PROFILES
张年学 1李晓 1盛祝平 2赫建明1
作者信息
- 1. 中国科学院页岩气与地质工程重点实验室,中国科学院地质与地球物理研究所 北京 100029
- 2. 德州农工大学埃尔帕索农业生命科学研究中心 德州 美国 79927
- 折叠
摘要
Abstract
The accuracy is the most important in stability analysis of a landslide.Both the sliding plane and the slope surface are three dimensional,resulting in great spatial variation of thicknesses of the sliding body.The analysis of slope stability is usually carried out by calculating the factors of safety along the "representative longitudinal profile" of the central axis or nearby profile.Because the calculation uses a unit width,the results can only represent the local stability of the slope within small widths on both sides of the selected profile in most cases, but not the stability of the entire landslide.Therefore a multi-profile joint forces method is proposed to assess the stability of a landslide.To reduce the man-power and cost for multi-profile exploration of a landslide,the sliding surfaces are classified into two categories:simple slip surface and complex slip surface.For a simple slip surface,it is required to have a minimum of two profiles with a total of 2 to 4 boreholes.The multiple longitudinal profiles required for calculation are then delineated through drawing the auxiliary cross sections by using several curve functions of the slip surface.The multi-profile joint forces method is based on parallelogram law for addition of forces.Each profile is first divided into slices.The shear forces and resistance forces of each slice are then converted to horizontal and vertical components on each slice of a profile.The horizontal and vertical resulting forces along each profile are determined by adding the horizontal and vertical shear forces and resistance forces on all slices,respectively.The resulting joint sliding force and resistance forces on all profiles are used to calculate the sliding and resistance forces of the entire landslide.Their ratio(resistance force vs.sliding force)-the safety factor of the landslide are calculated at the end.Two case studies of landslides,one with a simple slip surface and another with a complex slip surface,are used to validate the method.关键词
滑坡/稳定性/多剖面/合力法Key words
Landslide/Stability/Multiple profiles/Joint forces method分类
天文与地球科学引用本文复制引用
张年学,李晓,盛祝平,赫建明..多剖面合力法分析滑坡稳定性[J].工程地质学报,2017,25(5):1190-1204,15.
