醴陵市枧上社区江华组滑坡稳定性分析及失稳机制

2021-01-15 00:44:40凌波,陈婉君,张海忠
国土资源导刊 2021年4期

凌波,陈婉君,张海忠

摘 要 湖南醴陵地区是滑坡地质灾害影响较为严重的地区之一。本文以醴陵市泗汾镇枧上社区江华组滑坡为例,在收集自然地理及区域地质环境资料基础上,结合滑坡勘查资料,对滑坡类型、变形特征及成因机制进行研究,综合利用传递系数法定量分析评价滑坡的稳定性,采用ABAQUS有限元模拟滑坡滑动变形过程。结果表明该滑坡依旧处于不稳定状态,未来在暴雨状态下,滑坡体大概率会再次发生推移式滑动。

关键字 滑坡;成因机制;稳定性;数值模拟

中图分类号: P694 文献标识码:A

Stability Analysis and Instability Mechanism of Jianghua Formation Landslide in Jianshang Community, Liling City

Ling Bo , Chen Wanjun , Zhang Haizhong

(214Team, Hunan Geological & Mining Organization for Non-Ferrous Metals, Zhuzhou Hunan 412007)

Abstract: Liling area in Hunan is one of the areas with serious landslide geological disasters. Jianghua Formation landslide in Jianshang Community of Sifen Town, Liling City was taken as an example. Based on the collection of natural geography and regional geological environment data, combined with landslide exploration data, the types, deformation characteristics and genetic mechanism of landslide were studied. The transfer coefficient method was used to quantitatively analyze and evaluate the stability of landslide and the ABAQUS finite element simulation was employed to simulate landslide sliding deformation process.The results show that the landslide is still in an unstable state. In the future, the landslide will slide again under heavy rain.

Keywords: landslide; genetic mechanism; stability; numerical simulation

醴陵市泗汾镇枧上社区江华组滑坡位于湖南省醴陵市四汾镇,2019年7月9日,受50年一遇的强降雨影响,该滑坡发生明显滑动变形,造成财产损失,并威胁人身安全。2020年7月,受醴陵市自然资源局委托,我单位技术人员实地勘察,发现滑坡裂缝依然有变宽趋势,推断滑坡依然处于不稳定状态,严重威胁前缘居民人身财产安全。

1 区域工程地质条件

滑坡所在区域为低山丘陵地貌,滑坡所在山体海拔最大高程88 m,前缘最低高程55 m,最大相对高差为33 m,山体坡度20°~50°,整体地势为北高南低。滑坡前缘因切坡建房,形成局部临空,如图1所示容易导致滑坡地质灾害。

滑坡区地层岩性由新到老依次为更新统(Qp)碎石土、戴家坪组(K2dj)强风化-半风化砂岩夹薄层泥岩。根据工程揭露情况,第四系碎石土主要分布表层,厚度不均匀,山坡厚度1~3 m,山顶及山脊厚度达到6~8 m,成分主以砾石、砂质及少量泥质、腐殖质组成。……

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