滑坡温度特性研究及其在三峡库岸稳定分析中的应用

三峡库区中有上百个大型滑坡,确定这些滑坡发生时的最大滑动速度是库岸稳定性研究中的一个重要内容。研究滑坡温度场,一方面可以了解高速滑坡的机理,更重要的是,通过反测滑带温度。可以定量计算滑坡发生时的最大速度。本文研究了滑坡体、特别是滑带温度场的变化规律,导出了滑带温度场的变化方程;结合摩擦系数的变化规律,讨论了温度与滑动速度、滑动时间、滑体厚度以及滑体热力学参数的关系,并以试验结果加以验证,从而获得了滑体中温度场分布的基本规律;最后,作者根据三峡库区四个大型滑坡滑带温度值,定量给出了滑坡最大速度,其结果与现场资料相当吻合。

STUDY ON-THE LANDSLIDE TEMPERATURE FIELD AND ITS APPLICATION TO THE THREE GORGES PROJECT

To datermine the maximum speed of landslides is one of the most important contents in assessing the slope stability of the Three Gorges. Studies of the temperature field not only enable the understanding of the mechanism of highspeed landslides but also can provide a quantitative calculational result of the maximum speed when the landslide occurred through inversing the temperature of the sliding belt.In this paper, the temperature field of the sliding body, especially that in the landslide plane, is discussed in detail; the equation of temperature field in the landslide plane is derived, the relation of temperature with the sliding speed, sliding duration, sliding body thickness and thermodynamic parameters of the sliding body is discussed in connection with the variation of the friction coefficient and is verified by laboratory test results. On such a basis, the basic law of temperature distribution in the sliding body is obtained. Finally, the maximum landslide speeds of four large scale landslides in the Three Gorges region are quantitatively calculated on the basis of the temperature values in the sliding belts. The results are in good agreement with the data of field survey.