束口型边坡多剖面稳定性分析方法  

Multiple profiles stability analysis method for spoon-shaped side slope

作　　者：雷磊 李小伟 邓南山 王腾 陈永宝 程林 Lei lei;Li Xiaowei;Deng Nanshan;Wang Teng;Chen Yongbao;Cheng Lin(Central South Institute of Metallurgical Geology,Yichang,Hubei 443003)

机构地区：[1]湖北冶金地质研究所(中南冶金地质研究所),湖北宜昌443003

出　　处：《资源环境与工程》2024年第5期620-626,636,共8页Resources Environment & Engineering

基　　金：宜昌市自然科学基金(A23-2-040)。

摘　　要：山谷、洼地等下凹区域通常是堆放城市弃渣的首选之地,特殊地形条件下往往形成“肚子大、出口小”的瓢形体渣堆,受束口状地形的约束,主剖面已无法再反映此类束口型边坡的真实受力状态。选取深圳市红坳渣场滑坡为研究对象,提出一种基于剩余推力法的多剖面稳定性分析方法。结果表明,随着堆渣量的不断增加,渣体内部的剪应力分布范围不断扩大,在渣体前缘及束口处不断形成应力集中现象;在相同的工况条件下,多剖面法所得到的稳定性系数更加趋近于此类渣堆的真实稳定性状态;特殊的地形条件和物质组成是此类束口型边坡产生应力集中现象的内在原因。因此,多剖面稳定性分析方法更容易揭露这类看似稳定实则蕴含较大失稳风险的束口型人工渣土边坡,为实际工程提供了新的方法和思路。Valleys,depressions and other low-lying areas are usually the preferred places for urban waste accumulation,and under special terrain conditions,they often form“big bellies,small outlets”scoop-shaped slag piles.Due to the constraints of the spoon-shaped terrain,the main profile can no longer reflect the true stress state of this type of spoon-shaped side slope.This paper selects the Hong ao landslide in Shenzhen City as the research object and proposes a multiple profiles stability analysis method based on residual thrust method.The results show that,with the continuous increase of slag accumulation,the distribution range of shear stress inside the slag body continues to expand,and stress concentration phenomena continue to form at the leading edge and bundle mouth of the slag body.Under the same working conditions,the stability coefficient obtained by the multiple profiles method is closer to the true stability state of this type of slag pile.The special terrain conditions and material composition are the inherent reasons for the stress concentration phenomenon in this type of spoon-shaped side slope.Therefore,the multiple profiles stability analysis method is more likely to reveal the spoon-shaped side slope that appears stable but actually carries a greater risk of instability,providing new methods and ideas for practical engineering.

关 键 词：瓢形体渣堆 束口型边坡 稳定性分析 主剖面法 多剖面法 

分 类 号：P642.23[天文地球—工程地质学] TU457[天文地球—地质矿产勘探]