近水平软岩边坡楔裂扩张力致滑机理研究实例

王子江; 王崇艮; 王 科; 胡 惠

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铁道工程学报 ›› 2012, Vol. 29 ›› Issue (12) : 36-41.

地质与路基

近水平软岩边坡楔裂扩张力致滑机理研究实例

王子江;王崇艮;王科;胡惠

作者信息 +

Research on Mechanism of Landslide of Nearly Horizontal Soft Rock Slope Caused by Wedge—-shape Cracking Expansionary Force

WANG Zi一jiang，WANG Chong一gen，WANG Ke，HU Hui

Author information +

文章历史 +

摘要

研究目的：在近水平非膨胀软岩地区，经常发生滑坡，给工程建设以及人类活动带来危害。本文结合兰渝铁路D1K641路堑工程滑坡勘察，从岩石(体)水理特性试验着手，研究非膨胀软岩遇水产生裂缝的机理，以及近水平软岩边坡变形破坏的力学机制，这对整治或预防近水平软岩边坡变形破坏具有重要实际意义。

研究结论：(1)软岩遇水产生楔裂扩张力，在楔裂扩张力作用下岩体发生楔裂性崩解，强度显著降低。(2)近水平软岩边坡变形破坏模式：岩体遇水首先在楔裂扩张力作用下发生垂向楔裂破坏并向深部发展，遇到特殊层间时在楔裂扩张力、裂缝静水压力、重力、沿层面渗流水的扬压力，以及强度大大降低的综合作用下沿层间发生剪裂破坏，致使岩体失稳并向临空面滑移形成滑坡。(3)楔裂扩张力在边坡变形破坏、滑移中起着关键作用。

Abstract

Research purposes:In the area of nearly horizontal unexpansive soft rock mass，the landslide often happens to harm the engineering and human activities. Combined with the survey for the sliding of D1 K641 cutting slope of the Lanzhou一Chongqing Railway，the research was done on the mechanism of the reason for producing the crack of unexpansive rock mass caused by water and the mechanic mechanism of the deformation destruction of nearly horizontal soft rock slope based on doing the performance tests of soft rock mass. This research is crucial to prevention of the deformation destruction of nearly horizontal soft rock slope.

Research conclusions:(1)If the soft rock mass meets water, the wedge一shape cracking disintegration will happen to the soft rock mass under the effect of the wedge一shape cracking expansionary force and the strength of soft rock mass decreases obviously.(2)The mechanism of the deformation destruction of the nearly horizontal soft rock mass slope is as fellows:When meeting water, the nearly horizontal soft rock mass engenders vertical wedge shape cracking and the crack develops deeply under the effect of the wedge一shape cracking expansionary force. When meeting the special layer，the nearly horizontal soft rock mass produces the shear fracture destruction along the layer to cause the rock mass unstable and moving along the hollow surface to produce landsliding under the comprehensive effects of wedge一shape cracking expansionary force，hydrostatic一pressure，gravity and uplifting pressure and less strength.(3)The wedge一shape cracking expansionary force plays a key role in the course of deformation and destruction of slope.

导出引用

王子江, 王崇艮, 王科, 等. 近水平软岩边坡楔裂扩张力致滑机理研究实例[J]. 铁道工程学报, 2012, 29(12): 36-41

WANG Zi一jiang, WANG Chong一gen, WANG Ke, et al. Research on Mechanism of Landslide of Nearly Horizontal Soft Rock Slope Caused by Wedge—-shape Cracking Expansionary Force[J]. Journal of Railway Engineering Society, 2012, 29(12): 36-41

中图分类号： P642

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