四川茂县新磨村高位滑坡铲刮作用分析

张涛; 杨志华; 张永双; 陈亮; 吴瑞安

doi:10.16030/j.cnki.issn.1000-3665.2019.03.19

四川茂县新磨村高位滑坡铲刮作用分析

基金项目:

国家自然科学基金项目（41502313；41731287）；中国地质调查局地质调查项目（DD20160271）

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出版历程
- 收稿日期: 2018-09-21
- 修回日期: 2018-12-21

An analysis of the entrainment of the Xinmo high-position landslide in Maoxian county, Sichuan

ZHANGTao,

摘要

摘要: 2017年6月24日，四川省茂县叠溪镇新磨村发生高位顺层山体滑坡，滑动高差达1 160 m，滑动平距约2 200 m。该滑坡的滑动方量巨大，与其滑动过程中产生的铲刮效应有关。为分析其铲刮效应，文章通过现场调查、遥感影像解译和无人机航拍图像，确定该滑坡的滑动全过程为：多次历史地震造成滑坡源区岩体结构破碎，降雨沿顶部裂隙入渗导致水压力增大及石英砂岩中的薄层板岩软化，在长期疲劳效应下斜坡上部岩体最终发生滑动；上部滑体在运移过程中，对斜坡中部浅表风化层、部分基岩及下部老滑坡堆积体进行铲刮并重新堆积。采用Rockfall软件模拟源区滑体的运动路径、速度与能量，结果表明：在碎屑流区和老滑坡堆积区都存在明显的集中铲刮作用，整个滑坡的高危险区也主要位于该区域，所以危险性分区可代表不同滑坡区域的铲刮程度。计算得两个区域的铲刮方量分别为4.9×106，4.38×106 m3，滑坡总方量为13.35×106 m3。该模拟和计算方法迅速有效，可为以后类似滑坡的应急、救灾和铲刮方量计算提供参考。
- 高位滑坡 /
- 滑坡-碎屑流 /
- 新磨村滑坡 /
- 铲刮效应 /
- Rockfall模拟
Abstract: On 24 June 2017, a bedding landslide occurred in Diexi town, Maoxian County, Sichuan, China. The elevation difference of this landslide reached 1 160 m, with a long run-out of 2 200 m. The huge volume of this landslide is relevant to the entertainment during sliding. For researching the effect of entertainment, this paper reveals the process of this landslide based on site investigation, remote sensing image and UAV imagery data: historical earthquakes resulted in broken structures of rock masses; rainfall seeped into the thin layer of slate rock between quartz sandstones through rock failures, simultaneously the pore pressure increased, which results in the source area rock eventually sliding down; then the upper landslide body underwent entrainment at the middle bedrock area, part of which was weathered and lower gravel-soil accumulation area during its run-out process. We simulates the trajectory, velocity and energy of landslide by means of Rocfall software, the results show that centralized entertainment existed in debris flow area and gravel-soil accumulation area, which are exactly the high risk area. The entertainment volumes of the two area are 4.9×106 m3 and 4.38×106 m3, the overall volume of landslide is 13.35×106 m3.The methods of this paper is swiftly and effectively, which can provide reference for disaster relief and calculation of similar landslides.
- high position landslide /
- landslide-debris flow /
- Xinmocun landslide /
- entertainment effect /
- Rocfall simulation

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