水力效应下的亚高山草甸土溜滑破坏试验  

An Experiment of Slip and Slide Damage in Subalpine Meadow Soils under Hydraulic Effects

作　　者：邓远东 郭健[1] 易鹏飞 DENG Yuandong;GUO Jian;YI Pengfei(State Key Laboratory of Geo-hazard Prevention and Geo-environment Protection,Chengdu University of Technology,Chengdu 610059,China;Sichuan Institute of Geological Engineering Investigation Group Co.,Ltd.,Chengdu 610072,China)

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,成都610059 [2]四川省地质工程勘察院集团有限公司,成都610072

出　　处：《实验室研究与探索》2022年第2期1-4,59,共5页Research and Exploration In Laboratory

基　　金：国家自然科学青年基金项目(41807292);成都理工大学珠峰科学研究计划(80000-2020ZF11410)。

摘　　要：应用野外调查结果建立室内物理模型,模拟亚高山草甸土在降雨条件下的浅层溜滑破坏过程,研究水力效应下的亚高山草甸土溜滑破坏机理。结果表明:当水头高度调整到4 cm时,42 s后坡脚孔隙水压力达到峰值0.372 kPa,此时坡脚土压力也达到峰值4.63 kPa,试验土体开始发生溜滑破坏;当水头高度调整到临界高度时,不断增加的动水压力是导致亚高山草甸土溜滑破坏的主因。通过揭示水力效应下的溜滑破坏机理,可为建立亚高山草甸土溜滑破坏的稳定性预测模型提供理论基础。An indoor physical model was developed by usingthe results of the field survey to simulate the shallow slip damage process of subalpine meadow soils under rainfall conditions,and to investigate the slip damage mechanism under hydraulic effect.The test results show that when the test head height is adjusted to 4 cm,the pore water pressure at the foot of the slope reaches a peak of 0.372 kPa after 42 seconds,and the soil pressure at the foot of the slope also reaches a peak of 4.63 kPa at this time,and the test soil starts to slip damage.Discussion of the test results shows that the increasing dynamic water pressure is the main cause of slip damage in subalpine meadow soils when the test head height is adjusted to a critical height.By revealing the mechanism of slip damage under hydraulic effects,it can provide an important theoretical basis for the establishment of a stability prediction model for slip damage of subalpine meadow soils.

关 键 词：亚高山草甸土 溜滑破坏 水力效应 临时饱和带 

分 类 号：P642.22[天文地球—工程地质学]