乌蒙山区红层软岩滑坡地质演化及灾变过程离心机模型试验研究

doi:10.13722/j.cnki.jrme.2017.1644

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摘要乌蒙山区由砂岩、泥岩、页岩等组成的缓倾角红层软岩分布广泛，软质岩石与硬质岩石形成的互层状结构体易形成滑坡。针对该类滑坡，以花生地滑坡为例，采用地质分析与离心机模型试验相结合的方法，对降雨作用下滑坡地质演化和灾变过程进行研究。研究表明，红层软岩具有易软化蠕滑，风化崩解等地质力学特性。岩体损伤与水软化效应耦合作用是影响红层软岩斜坡稳定性主要因素，斜坡岩体受地震、河谷下切等地质作用产生深部裂隙，同时裂隙的贯通促进降雨入渗，导致滑带饱水软化、加速蠕变变形至失稳。最终在暴雨形成水动力失稳破坏。滑坡地质演化和灾变过程可分为原始斜坡→岩体损伤劣化→水软化蠕滑→降雨诱发失稳破坏4个阶段。研究成果为降雨型红层软岩斜坡稳定性机制分析及工程治理提供参考。

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	白永健1
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关键词 ：边坡工程, 红层软岩, 滑坡, 地质演化, 灾变机制, 离心机模型试验

Abstract：Red-bed soft rocks with gentle dip angle，which comprise sandstone，mudstone and shale，are widely distributed in Wumeng Mountain Area，and numerous landslides are easily triggered by soft and hard interbedded rocks. In this study，Huashengdi landslide was studied using geological investigation and centrifuge tests，which aimed to explore geological evolution and sliding process affected by rainfall infiltration. According to the study results，red-bed soft rocks have geomechanics properties of easy softening，creeping，weathering and disintegration. The interaction of rock damages and water softening，which has been found to be the main factor for affecting the stability of red-bed soft rock slope，where deep cracks are formed by geological action，such as earthquake，valley incision，etc. Meanwhile，the cracks promote the rainfall infiltration，resulting in saturated water softening at the sliding zone，quick creep deformation and even sliding. It may eventually give rise to the damage due to hydrodynamic instability in heavy rains. Geological evolution and sliding processes of landslide are divided into four stages，including the initial status，damage and degradation of rock mass，water softening and creepage，and instability triggered by rainfalls. The study results serve as the basis for analyzing the stability mechanism and engineering improvement of rainfall-type red-bed soft rock slopes.

Key words： slope engineering red-bed soft rock landslide geological evolution sliding mechanism centrifugal tests

引用本文:

白永健1，2，葛华1，冯文凯2，徐伟1，2，铁永波1. 乌蒙山区红层软岩滑坡地质演化及灾变过程离心机模型试验研究[J]. 岩石力学与工程学报, 2019, 38(S1): 3025-3035.
BAI Yongjian1，2，GE Hua1，FENG Wenkai2，XU Wei1，2，TIE Yongbo1. Centrifugal tests on geological evolution and sliding process for red-bed soft rock landslide in Wumeng Mountain Area. , 2019, 38(S1): 3025-3035.

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http://rockmech.whrsm.ac.cn/CN/10.13722/j.cnki.jrme.2017.1644 或 http://rockmech.whrsm.ac.cn/CN/Y2019/V38/IS1/3025

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