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。
关键词:
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崩解
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花岗岩风化土
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水土作用
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吸力
Abstract:
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 disintegration from softening and slaking.The intense softening and slaking 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.
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