库水位下降诱发的特大型顺层岩质滑坡变形特征与诱发机制

doi:10.13722/j.cnki.jrme.2020.0728

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摘要通过三峡库区旧县坪滑坡2016年6月～2018年8月的GNSS监测数据，采取多因素综合过程分析和定量分析手段，分析了滑坡变形在库水位7个不同变化过程下的响应特征和诱发机制。研究表明：(1) 库水位下降是旧县坪滑坡位移变形的主要诱发因素，一般情况下，库水位下降速率越大，滑坡稳定性越差：库水位快速下降期间(＞0.4 m/d)无强降雨时，滑坡仍可产生较强位移变形；库水位缓慢下降期间(＜0.2 m/d)无强降雨时，滑坡一般不产生明显变形。(2) 强降雨在库水位下降期和145 m低水位运行期对滑坡位移变形可产生促进和一定的诱发作用，在库水位上升期(＞0.5 m/d)则难以诱发滑坡产生变形。(3) 对诱发滑坡变形来讲，降雨强度可以和库水位下降速率起相互补偿作用。即：通常情况下，库水位下降速率越大，诱发滑坡产生变形的降雨量可以更小。(4) 库水位升–降转换期，渗透压力方向在一段时间内会逆库水位的下降变化而指向坡内，强降雨和库水位下降速率在一段时间内(数日至十余日)均不能诱发滑坡产生明显位移变形。(5) 库水位高频低幅波动期间，总的渗透压力方向一般指向坡内，此阶段无论库水位下降速率多大，滑坡通常不会产生较强变形。该研究成果可对水库涉水型滑坡成因机制分析、监测预警判据研究、动态风险管理及应急抢险处置等提供重要借鉴。

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	谭淋耘1
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	黄润秋1
	裴向军1

关键词 ：边坡工程, 三峡库区, 旧县坪滑坡, 库水位, 变形特征, 诱发机制

Abstract：Based on the GNSS monitoring data of Jiuxianping landslide in the Three Gorges Reservoir area from June 2016 to August 2018，comprehensive multi-factor dynamic process analysis and quantitative analysis are performed to analyze the response characteristics and the inducing mechanisms of landslide deformation under seven different changing processes of reservoir water level(RWL). The research results show that the falling of the RWL is the main inducing factor for the deformation of Jiuxianping landslide. In general，the greater the rate of the RWL decline，the worse the stability of the landslide. Landslide deformation can be promoted by intense rainfall including short-term heavy rainfall，continuous heavy rainfall and intermittent heavy rainfall during the falling period and the 145 m maintaining period of RWL，while it can hardly be promoted by any type of intense rainfall in the RWL rapid rising period(＞0.5 m/d). For inducing landslide deformation，heavy rainfall can compensate with the RWL decline rate. In other words，generally speaking，the greater the RWL decline rate，the smaller the threshold of the precipitation which could induce the landslide deformation. That is to say，for a reservoir wading landslide，the rainfall threshold is not fixed but varies greatly with the process of the RWL change. As the direction of the seepage pressure points into the inside of the slope during the RWL rising-falling transition period，neither of the intense rainfall nor the RWL falling rate can induce the landslide deformation for about a few days to more than ten days. During the period of high frequency and low amplitude fluctuations of the RWL，the direction of the total seepage pressure generally points into the inside of the slope，therefore，the apparent landslide deformation cannot be induced by the RWL decline in this period. These research results are meaningful for the deformation inducing mechanism analysis，dynamic risk management，emergency treatment，and early warning criteria of monitoring for the reservoir wading landslide.

Key words： slope engineering Three Gorges Reservoir area Jiuxianping landslide reservoir water level deformation characteristics inducing mechanism

引用本文:

谭淋耘1，2，3，黄润秋1，裴向军1. 库水位下降诱发的特大型顺层岩质滑坡变形特征与诱发机制[J]. 岩石力学与工程学报, 2021, 40(2): 302-314.
TAN Linyun1，2，3，HUANG Runqiu1，PEI Xiangjun1. Deformation characteristics and inducing mechanisms of a super-large bedding rock landslide triggered by reservoir water level decline in Three Gorges Reservoir area. , 2021, 40(2): 302-314.

链接本文:

http://rockmech.whrsm.ac.cn/CN/10.13722/j.cnki.jrme.2020.0728 或 http://rockmech.whrsm.ac.cn/CN/Y2021/V40/I2/302

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