澜沧江某冰水堆积体演化过程及工程地质问题探讨  

Discussion about the Evolution and the Geoengineering Problems of an Outwash Deposits,Lantsang

作　　者：涂国祥[1] 黄润秋[1] 邓辉[1] 

机构地区：[1]成都理工大学地质灾害防治与地质环境保护国家重点实验室,四川成都610051

出　　处：《山地学报》2009年第1期54-62,共9页Mountain Research

基　　金：国家自然科学基金重点项目(50539050)雅砻江流域高边坡发育的动力过程及其工程适宜性评价资助~~

摘　　要：第四纪冰期大型山岳冰川运动遗留下的大型冰水堆积体是我国西南高山峡谷地区一类重要的第四系堆积物。本世纪以来,随着该地区大型基础工程的陆续上马,这种大型冰水堆积体的存在常常成为工程建设必须面临的工程地质问题,这些冰水堆积体因其形成演化过程的特殊性,使得其在结构、物质组成、力学特性、水理特性等诸多方面与一般松散堆积体存在显著差别,因而研究其结构特征、形成演化过程以及带来的工程地质问题具有重要意义。以澜沧江某电站坝前冰水堆积体为例,在调查分析其结构特征的基础上,对冰水堆积体的形成演化过程进行分析和研究,并对冰水堆积体的工程特性,以及带来的工程地质问题进行了探讨,认为该冰水堆积体的工程特性明显好于其他第四系松散堆积体,电站蓄水后整体失稳的可能性较小,但其前缘仍存在局部失稳的可能。The outwash deposits which are left behind by the movement of mountain gtacieris is an important kind of deposits in the Quaternary Period, in the southwest area of China. Since this century, a lot of large-scale projects have been continuously made. Those outwash deposits have constituted geoengineering problems of those projects. Because of the special evolution, those outwash deposits are different to some ordinary incompact deposits in structure, components, mechanical characteristic, Hydrolytic Weakening Properties, and other facet. So it is very significant to research the outwash deposits＇ structural characteristic and origin and the geoengineering problems. In this paper, through a case study of the outwash deposits in front of a dam in Lantsang, we have investigated the outwash deposits＇ structural characteristic, Based on this, we have studied the evolution of the outwash, the engineering properties and the geoengineering problems of the deposits. We have drawn a conclusion that the engineering properties are better to other ordinary incompact deposits, and t the whole stability of the outwash deposits is good, but it＇ s possible that the front part of the outwash deposits will fail after the power station reserving.

关 键 词：冰水堆积体 结构特征 演化过程 工程地质问题 

分 类 号：P642[天文地球—工程地质学]