贵州某公路长大顺层滑坡成因分析及稳定性评价
Stability Evaluation and Analysis of Landslide in Long Daylighted Bedding of a Highway in Guizhou Province
雷青 1刘仕洪 1张亚 1陈民 1姜波2
作者信息
- 1. 贵州省铜仁公路管理局,贵州铜仁 554300
- 2. 贵州省交通规划勘察设计研究院股份有限公司,贵阳 550001
- 折叠
摘要
为了评价国道G326甘龙滑坡的稳定性,综合现场调查、钻探等手段详细查明了滑坡的工程地质条件及成因,并结合geo-studio软件对考虑强降雨入渗条件下的滑坡进行了稳定性评价.结果表明:滑坡地形相对较陡,下伏基岩顺切,岩土体工程性质较差,雨水长期冲刷形成的长大裂隙切割岩体导致斜坡体临空,构成了长大顺层巨型滑坡形成的基本条件;滑坡前一周降雨强度达到全年最高,坡体后缘浸润线抬升,坡体孔隙水压力陡增,且坡体内部特别是中前部渗透压力达到峰值,斜坡稳定性骤降;强降雨补给引起的渗流作用及孔隙水压力变化是滑坡形成的主要诱发因素.
Abstract
To evaluate the stability of the Ganlong landslide in National Route G326,the engineering geological conditions and factors that triggering the landslide are identified in detail by the comprehensive field investigation,drilling and other methods.The stability of the landslide under the consideration of the heavy rainfall infiltration is evaluated by the geo-studio software.The result shows that the landslide topography is relatively steep,the underlying bedrock is tangential,the engineering proper-ties of rock and soil mass are poor,and the long fissure cutting rock mass formed by the long-term rain erosion leads to the cav-itation of the slope body,which constitutes the basic conditions for the formation of a large long daylighted bedding landslide.One week before the landslide,the rainfall intensity reached the highest in the entire year,the infiltration line at the rear edge of the slope raised,the pore water pressure of the slope increased sharply,and the infiltration pressure inside the slope,espe-cially in the middle and front of the slope,reached a peak,and the slope stability sharply reduced.The seepage and pore water pressure induced by the heavy rainfall are the main inducing factors of landslide formation.
关键词
长大顺层滑坡/成因分析/geostudio/强降雨/稳定性评价Key words
Long Daylighted Bedding Landslide/Cause Analysis/Geostudio/Heavy Rainfall/Stability Evaluation引用本文复制引用
基金项目
贵州省公路局科技项目(2022QLK04)
交通运输行业重点科技项目(2021-ZD1-021)
交通运输行业重点科技项目(2022-MS1-058)
贵州省交通厅科技项目(2022-122-003)
出版年
2024
NETL
NSTL
万方数据