| 松散堆积体工程边坡变形机理分析及支护对策研究 |
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| 引用本文： | 赵建军, 巨能攀, 涂国祥. 2008: 松散堆积体工程边坡变形机理分析及支护对策研究. 工程地质学报, 16(5): 611-615. |
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| 作者姓名： | 赵建军 巨能攀 涂国祥 |
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| 作者单位： | 1.成都理工大学地质灾害防治与地质环境保护国家重点实验室 成都 610059 |
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| 摘 要： | 合理选择开挖坡比、正确认识变形破坏机理是影响松散堆积体边坡稳定性和施工安全的前提, 本文研究了西南地区某松散堆积体工程边坡的结构特征, 根据地形条件确定了合理的开挖坡比, 采用二维有限元研究了开挖边坡的变形机理并根据模拟结果确定潜在滑动面, 在此基础上, 提出支护对策。研究结果表明, 边坡由厚度达70m 的坡洪积、泥石流块碎石堆积体组成, 斜坡下部缓中部稍陡, 开挖平台位于缓坡部位, 根据地形条件结合坡体结构特征确定边坡开挖坡比为1: 0. 75; 数值模拟结果表明, 边坡变形开挖面附近及坡顶拉应力和坡体下部最大剪应力控制, 坡顶部位将首先产生拉张裂隙, 开挖边坡内部产生从坡脚部位向上发展的剪切变形, 滑面一旦与坡顶拉裂缝贯通, 边坡将产生整体失稳; 边坡采用锚拉桩、锚索框架、锚杆框架、排水相结合的综合治理措施进行支护。
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| 关 键 词： | 松散堆积体 边坡 变形机理 支护设计 |
| 收稿时间： | 2008-06-17 |
| 修稿时间： | 2008-09-11 |
DEFORMATION MECHANISM AND SUPPORTING MEASURES OF MAN-MADE SLOPES IN LOOSE DEPOSITS |
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| ZHAO Jianjun, JU Nengpan, TU Guoxiang. 2008: DEFORMATIONMECHANISM AND SUPPORTINGMEASURES OFMANMADE SLOPES IN LOOSE DEPOSITS. JOURNAL OF ENGINEERING GEOLOGY, 16(5): 611-615. |
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| Authors: | ZHAO Jianjun JU Nengpan TU Guoxiang |
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| Affiliation: | 1.S tate K ey Laboratory of G eohazard P revention and Geo - Environm ent Pro tection, Chengdu University of Techno logy, Chengdu 610059 |
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| Abstract: | This paper is to study the selection of rational slope ratio and slope deformation mechanism in loose deposits,which is the basis of slope stability evaluation and supporting design.A man-made slope comprising loose deposits in Southwest China is taken as an example.Based on study on the characteristics of loose deposits,rational slope ratio is defined according to the terrain.Two-dimensional finite element method is used to study deformation mechanism of the cut slope and to determine potential slide surface.At last,the supporting measures are put forward according to the slope stability analysis.The slope has loose deposits of 70 m in thickness comprising alluvial,proluvial,and debris flow deposits.The slope ratio is designed as 1:0.75 because the engineering flat is located at the lower part of the slow slope,whose upper part is steeper.The result of numerical simulation indicates that the cut slope area and the slope crest area generate tension stresses.The maximum shear stress concentrates at the lower part of the slope,which result in tension cracks at the slope top and shearing deformation at lower part of the slope.When the shearing deformation develops upwards to the tension cracks,the slope would show an overall instability.According to the mechanism analysis and result of slope stability evaluation,a synthetical supporting measure is put forward to conform the stability of the slope during excavation and operation periods.The measure includes anchoring pile,anchor cable frame,anchor bolt frame,and drainage. |
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| Keywords: | Loose deposits Cut slope Deformation mechanism Supporting design Slope stability |
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