基于多源数据的蔡家坝特大型滑坡成因机制研究及稳定性评价

doi:10.13722/j.cnki.jrme.2018.0448

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摘要针对2014年8月31日～9月2日云阳县蔡家坝发生的 “8•31”特大型滑坡，首先结合历史记录资料、卫星遥感影像、无人机航拍以及现场调查资料等多源数据，初步明确滑坡范围、特征以及赋存环境；综合采用以钻探为主，辅以槽探、井探、物探的方式，开展室内和现场相关试验，探明滑坡区的地层特性、滑带特性以及滑体岩土物理力学性质，对滑坡形成机制进行深入探讨，在此基础上进行了滑坡的稳定性评价。结果表明：(1) 蔡家坝滑坡为降雨诱发的特大型多级平推式滑坡，具有多次、多层、逐级后退式演化的变形特点，滑坡堆积层滑动具有推移式特征，岩质滑体具有牵引式特征；(2) 滑坡存在4层滑面(带)，即土质滑带、浅层岩质滑带、中层岩质滑带和深层岩质滑带，现状滑动变形受控的主导滑带为土质滑带、浅层岩质滑带、中层岩质滑带；(3) 滑坡堆积层和滑坡滑动面(带)为现状变形提供了物质条件，前一级滑动后缘拉裂为后一级滑动提供了变形空间，在强降雨诱发下滑坡区大范围发生变形破坏，甚至局部滑动；(4) 稳定性计算结果表明，滑坡现状处于基本稳定～稳定状态，受暴雨影响稳定性显著下降，滑坡稳定性普遍下降为欠稳定～基本稳定状态，局部段可能发生失稳滑动。

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	张岩岩1
	2
	3
	文海家1
	2
	3
	麻超超3
	杨勇4
	付红梅5
	黄雪浪3
	薛靖元3

关键词 ：边坡工程, 多源数据, 降雨, 蔡家坝特大型滑坡, 成因机制, 稳定性分析

Abstract：On August 31 to September 2，2014，affected by an extreme rainfall，deformation of a super large slope at Caijiaba in Yunyang County was found to increase rapidly. Hence，this paper employs the multi-source data，namely historical records，satellite remote sensing image，UAV aerial photography and field survey data，etc.，to determine the scope，characteristics and environment of the landslide. Afterwards，drilling，trenching，well exploration and geophysical exploration，indoor and field experiments were carried out to determine the landslide area formation，sliding zone and physical and mechanical properties. The failure mechanism of landslide was discussed and the slope stability was analyzed. The results show that Caijiaba slope is a large multi-stage flat sliding slope induced by rainfall. There are four slip surfaces(zone)，namely the soil sliding zone，shallow rock sliding zone，middle rock sliding zone and the deep rock sliding zone. The status quo of the sliding deformation is controlled by soil sliding zone，shallow rock sliding zone and middle rock sliding zone. Earlier stage of landslide accumulation and landslide slip surface(zone) provide the material basis for the status quo of deformation. The rear edge crack of front sliding zone provides the space for the rear sliding zone to move. Under heavy rainfall，a wide range of deformation and failure may be induced, and local sliding is likely to be caused. Stability analysis shows that the landslide is in a basically stable to steady state. However，the stability under heavy rainfall is significantly reduced. The stability of the slope has generally been declining to the unstable to basically stable state, and local sliding may occur.

Key words： slope engineering multi-source data rainfall huge landslide at Caijiaba failure mechanism stability analysis

引用本文:

张岩岩1，2，3，文海家1，2，3，麻超超3，杨勇4，付红梅5，黄雪浪3，薛靖元3. 基于多源数据的蔡家坝特大型滑坡成因机制研究及稳定性评价[J]. 岩石力学与工程学报, 2018, 37(9): 2048-2063.
ZHANG Yanyan1，2，3，WEN Haijia1，2，3，MA Chaochao3，YANG Yong4，FU Hongmei5，HUANG Xuelang3，XUE Jingyuan3. Failure mechanism and stability analysis of huge landslide of Caijiaba based on multi-source data. , 2018, 37(9): 2048-2063.

链接本文:

http://www.rockmech.org/CN/10.13722/j.cnki.jrme.2018.0448 或 http://www.rockmech.org/CN/Y2018/V37/I9/2048

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