强震作用下山区滑坡稳定临界位移分析

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摘要强震作用下滑坡产生的永久滑动位移是其稳定性的量度参数，对一个滑坡系统，地震作用产生的永久位移是一个系统的状态参量，地震瞬态动力作用变形相当于系统的随机性“涨落”因素。滑坡系统的势能是一个取决于永久位移的能反映其稳定性状态又与具体振动过程路径无关的量，临界位移值实质上对应着系统势能的突变点，如何确定临界位移值的难题可转换为寻找系统势能突变点问题。以山区地震滑坡的地质模型和力学模型为基础建立势能突变理论模型，给出失稳判据和确定临界位移的方法，并对其适用条件进行讨论，发现临界位移值与滑带的几何特征、力学特性和滑体自重相关，与具体的地震波输入等无关，但临界位移作为滑坡稳定性的判据是有条件的。同时指出促使滑体滑动的根本因素是滑体相对下部基岩的加速度惯性力作用，简单地将强震仪记录的加速度直接施加到滑体上是有待商榷的。

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	钱海涛1
	张力方1
	兰景岩1
	王思敬2

关键词 ：边坡工程, 山区地震滑坡, 临界位移, 势能, 突变

Abstract：The permanent sliding displacement of a landslide induced by strong earthquakes is a metric parameter of stability and a state parameter of landslide system，and the transient deformation caused by seismic oscillation is equivalent to the random fluctuation of landslide system. Thus，in a landslide system，its potential energy lies on the permanent sliding displacement of slip mass，which can represent the stability state of the landslide system. At the same time，the potential energy is independent of specific vibration process of slip mass. Substantially，the critical sliding displacement corresponds to the catastrophe point of the system potential energy. So the problem of determining the critical sliding displacement can be converted to finding the catastrophe point of potential energy. A cusp catastrophe model is set up based on the geological and mechanical models of earthquake-induced landslides in mountainous area. Then the criterion for instability of landslides and methods for determining the critical sliding displacement are proposed，and the application condition of the criterion is discussed. It is found that the critical sliding displacement is related to the geometrical and mechanical characters of sliding zone and deadweight of slip mass，but has no relation with seismic wave. The critical sliding displacement can be treated as the stability criterion of a landslide conditionally. And it should be pointed out that the basic factor leading to sliding lies on the relative inertial force originated from the relative acceleration between the slip mass and base rock，and the way of applying the acceleration recorded by a strong motion seismograph to the slip mass directly is inappropriate.

Key words： slope engineering earthquake-induced landslides in mountainous area critical displacement potential energy catastrophe

引用本文:

钱海涛1，张力方1，兰景岩1，王思敬2. 强震作用下山区滑坡稳定临界位移分析[J]. 岩石力学与工程学报, 2012, 31(S1): 2619-2628.
QIAN Haitao1，ZHANG Lifang1，LAN Jingyan1，WANG Sijing2. ANALYSES OF CRITICAL SLIDING DISPLACEMENT OF LANDSLIDE INDUCED BY STRONG EARTHQUAKE IN MOUNTAINOUS AREA. , 2012, 31(S1): 2619-2628.

链接本文:

https://rockmech.whrsm.ac.cn/CN/Y2012/V31/IS1/2619

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