花岗岩风化土崩岗破坏机理分析  

The mechanism of disintegration damage of granite weathered soil

作　　者：颜波[1,2] 汤连生[1] 胡辉[2] 王大志[1] 林国威[1] 

机构地区：[1]中山大学地球科学系,广州510275 [2]中山大学应用力学与工程系,广州510275

出　　处：《水文地质工程地质》2009年第6期68-71,84,共5页Hydrogeology & Engineering Geology

基　　金：国家自然科学基金资助项目(40872205;50279056);全国高等学校博士学科专项科研基金资助项目(20070558032);广东省自然科学基金资助项目(07003738);广东省科技计划资助项目(2008B030303009;2004B32801002;2003C33301)

摘　　要：崩岗破坏是红层土中特有的破坏形式,在花岗岩风化土中发育更为强烈,这与花岗岩风化土自身的力学性质有关。本文认为花岗岩风化土自身的结构性、粒间吸力特性决定了其遇水软化和崩解的性质,花岗岩风化土软化主要表现为减压软化和损伤软化,花岗岩风化土颗粒粒径和孔隙大小不均匀性,以至土体在吸水过程中吸力不平衡导致其崩解作用。花岗岩风化土遇水发生软化和崩解是崩岗发生的内因,为崩岗破坏水土流失提供了物质来源,长期的水与重力作用是崩岗发生的外因,为崩岗持续发展提供了动力,在上述内因和外因作用下,最终形成了崩岗地貌。The disintegration damage of granite weathered soil is the most dramatic in the red soil, which is related with its own mechanical properties. The paper researches the mechanism of water-soil action in the from softening and slaking. The intense softening and slaking disintegration of granite weathered soil is supposed to be relative to its structural and unsaturated characteristics, the softening of granite weathered soil is deemed to decompression softening and damage softening, the no uniformity of grains and void characteristics of granite red soil, which cause suction imbalance in the process of soil wetting, that is the crucial reason to the red soil disintegrates. The softening and slaking of the soil is the internal cause of disintegration damage , and the long-term erosion of water and gravity is the external factor, which provides the sustained development power. Under the above internal cause and the external factor combined action, the collapsed the collapsing topography formed finally.

关 键 词：崩解 花岗岩风化土 水土作用 吸力 

分 类 号：P642.21[天文地球—工程地质学] TU411[天文地球—地质矿产勘探]