Relations between loess bedrock unconformity surface and landslide

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Scientific Journal of Earth Science September 2013, Volume 3, Issue 3, PP.88-94

Relations between Loess-bedrock Unconformity Surface and Landslide Xuemei Jia, Shouyun Liang† Key Laboratory of Mechanics on Disaster and Environment in Western China attached to the Ministry Education of China, and Department of Geological Engineering, School of Civil Engineering and Mechanics, Lanzhou, Gansu 730000, P.R. China †Email:

jiaxm07@lzu.cn

Abstract As originally weak texture plane, loess-bedrock unconformity surface is closely related to landslides developed seriously in loess areas, which has gradually attracted the attention of academics. By summarizing the interrelated literatures of loess-bedrock unconformity surface and landslide, we proposed some issues and future research fields: 1) to classify loess-bedrock unconformity surface; 2) to classify loess-bedrock landslide; 3) to research the structure and weathered crust characteristics of different types of loess-bedrock unconformity surfaces; 4) to research the spatial distribution of loess-bedrock unconformity surfaces and the correlation with landslides; 5) to research the impact of occurrence, morphology and structural characteristics of unconformity surfaces on loess slope stability, then to make further exploration on the action laws that unconformity surfaces, an important geological interface governs loess-bedrock landslides, so as to enrich the theory of formation mechanism of loess-bedrock landslides. Keywords: Loess-bedrock Unconformity Surfaces; Ancient Weathered Crusts; Loess landslides; Overview

黄土—基岩不整合面与滑坡的关系 贾雪梅,梁收运 西部灾害与环境力学教育部重点实验室,兰州大学土木工程与力学学院地质工程系,甘肃 兰州 730000 摘 要:不整合面属于原生的软弱结构面,黄土—基岩不整合面与黄土地区普遍发育的滑坡现象关系密切,逐渐引起学术 界的关注。通过对已有不整合面以及黄土滑坡相关的研究成果进行综述,提出了不整合面与黄土滑坡关系研究中存在的 问题以及今后的研究方向:1)黄土—基岩不整合面的分类问题;2)黄土—基岩滑坡的分类问题;3)不同类型黄土—基岩不 整合空间结构及风化壳发育特征;4)不整合面展布特征与滑坡空间发育规律之间的相关性;5)不整合面产状、形态及结 构特征对黄土斜坡稳定性的影响。进一步分析不整合面这一重要地质界面在黄土—基岩滑坡中的作用规律,丰富黄土滑 坡形成机理的理论。 关键词:黄土—基岩不整合面;古风化壳;黄土滑坡;综述

引言 地层不整合接触是地壳浅层一种常见的地质现象,不仅是划分地层单位、鉴定地壳运动、研究地质发 展历史的基本依据之一 [1,2],而且是重要的控藏、控矿构造 [3],同时在工程地质中还是重要的地质体分界面 或软弱结构面。 黄土高原地区沟壑纵横,伴随着人类工程活动规模和强度的日益增大,一些地方的黄土滑坡等地质灾 害频繁出现,尤其是与不整合面密切相关的黄土—基岩滑坡规模大、危害严重,常常造成重大的生命财产 损失。调查显示,该类滑坡的滑面常沿下伏第三系软弱泥岩等基岩顶面发育,或者在一定程度上受基岩倾 向的控制[4-6]。一般认为,红层沉积年代相对较新,岩性软弱,黄土层之下的红层基岩表面受到古风化作用 基金项目:国家自然科学基金资助项目(41072213). - 88 http://www.j-es.org/


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