摘要
以佛山市里水文头岭山体滑坡为例,通过调查、钻探和监测等手段,查明滑坡区地质环境条件和灾害特征,分析了影响因素和滑动机理。结果表明:(1)总体呈雨量越大滑动越快特点,滑动雨量阖值约30 mm;(2)煤系地层发育、顺向坡和褶皱构造作用是滑坡形成的内在因素,反倾粗砂岩条带被开挖和长期雨水入渗在粗砂岩条带位置积蓄形成静水压力作用是滑坡形成的间接诱发因素,强降雨作用是滑坡形成的直接诱发因素;(3)滑动机理模式为:早期雨水入渗并沿炭质泥岩界面径流,软化并加速滑动面形成;中期坡脚开挖临空,叠加坡上岩土体重力和坡脚静水压力,共同向下作用贯通滑面;后期强降雨诱发滑坡。研究成果可供同类煤系地层滑坡的调查评价、监测预警和后续防范治理参考。
The Lishui Wentouling landslide,Foshan City was investigated through investigation,drilling,and monitoring methods.The geological environmental conditions and disaster characteristics of the landslide area were identified,and the influencing factors and sliding mechanism were analyzed.The results show that:(1)the overall trend is that the larger the rainfall,the faster the sliding,with a sliding rainfall value of about 30 mm;(2)The development of coal bearing strata,along slope and fold structures are inherent factors in the formation of landslides.The excavation and long-term infiltration of rainwater into the coarse sandstone belt,resulting in static water pressure,are indirect triggering factors for landslide formation.Heavy rainfall is the direct triggering factor for landslide formation;(3)The sliding mechanism mode is characterized by early infiltration of rainwater and accelerated formation of sliding surfaces along the interface of carbonaceous mudstone due to softening of runoff.In the middle stage,excavation at the foot of the slope,combined with the gravity of the rock and soil mass on the slope and the static water pressure at the foot of the slope,acts downwards to penetrate the sliding surface.In the later stage,heavy rainfall induces landslides.This research can provide reference for the investigation,evaluation,monitoring,early warning,and subsequent prevention and control of landslides in similar coal bearing strata.
作者
韩庆定
易守勇
刘慧芬
庞志刚
杨晓聪
邓飞
罗锡宜
田才正
Han Qingding;Yi Shouyong;Liu Huifen;Pang Zhigang;Yang Xiaocong;Deng Fei;Luo Xiyi;Tian Caizheng(Foshan Geological Bureau of Guangdong Province,Foshan 528000,Guangdong,China;Foshan University,Foshan 528000,Guangdong,China)
出处
《岩土工程技术》
2025年第1期82-88,共7页
Geotechnical Engineering Technique
基金
佛山市财政项目(X20230258,X20190517)。
关键词
煤系地层
基岩滑坡
成因机理
coal-bearing strata
bedrock landslide
formation mechanism
作者简介
韩庆定,男,1987年生,硕士,主要从事地质灾害防治工作。E-mail:hanqding@126.com。
