恩施盆地红层边坡变形破坏模式研究

发布时间：2018-01-04 18:17

本文关键词：恩施盆地红层边坡变形破坏模式研究　出处：《工程地质学报》2016年06期 　论文类型：期刊论文

【摘要】：恩施盆地红层分布范围广,存在大量的斜坡或人工高陡边坡。由于红层岩体工程地质性质的特殊性,在自然地质作用和人类工程活动的影响下,边坡产生变形破坏,造成人员伤亡和财产损失,对城市市政工程和道路工程建设产生了较大的影响和制约。本文通过恩施盆地红层边坡的野外工程地质调查、钻探、现场试验(压水和渗水试验)、样品采集和室内岩体特性参数测试等工作,基本查清了红层的工程地质特性、水理特性和边坡变形特点。恩施盆地红层可分为"硬砂岩"和"软砂岩",前者由胶结较好的粉砂岩和砂岩组成,强度较高,透水性差,属相对隔水层;后者由胶结较差的砂岩构成,强度低,透水较强,为含水层。边坡变形破坏规模较小,但点多、危害较大。本文从运动方式和影响因素两个方面对边坡变形破坏模式进行研究,依据斜坡岩土体运动方式,红层边坡变形破坏划分为:顺层岩质滑坡、坠落式崩塌、倾倒式崩塌3种;按变形破坏影响因素,边坡变形破坏划分为:软硬互层红砂岩差异风化、顺层结构面和切层结构面不利组合、人工开挖扰动3种,并分析了各类变形破坏模式的特点和变形破坏过程,对恩施盆地及同类型地区的红层边坡变形破坏的防治具有指导意义及参考价值。
[Abstract]:There are a large number of slopes or artificial high and steep slopes in Enshi basin. Due to the particularity of engineering geological properties of red bed rock mass under the influence of natural geological action and human engineering activities. Slope deformation and destruction, resulting in casualties and property losses, urban municipal engineering and road engineering construction has a greater impact and constraints. This paper through the field engineering geological survey of the red bed slope in Enshi Basin. Drilling, field test (water pressure and seepage test), sample collection and indoor rock mass characteristic parameter test, basically check the engineering geological characteristics of red bed. The red beds of Enshi Basin can be divided into "hard sandstone" and "soft sandstone", the former is composed of siltstone and sandstone with better cementation, with high strength and poor permeability. The latter is composed of sandstone with poor cementation, low strength, strong permeability and aquifer. The scale of deformation and destruction of slope is small, but there are many points. In this paper, the deformation and failure mode of slope is studied from two aspects of movement mode and influencing factors. According to the movement mode of slope rock and soil mass, the deformation and failure of red bed slope is divided into: bedding rock landslide. Fall type collapse, toppling type collapse 3 kinds; According to the influence factors of deformation and failure, the slope deformation and failure can be divided into three types: soft and hard interbedded red sandstone differential weathering, unfavorable combination of bedding structure plane and cut layer structure plane, artificial excavation disturbance. The characteristics of various deformation and failure modes and the process of deformation and failure are analyzed, which is of guiding significance and reference value for the prevention and treatment of red bed slope deformation and failure in Enshi basin and the same type area.
【作者单位】：中国地质大学(武汉)工程学院;湖北省地质环境总站;
【基金】：中国地质调查局西部地区复杂山体滑坡成灾机理研究项目(1212011014029)资助
【分类号】：P642.2
【正文快照】： 0引言红层特指白垩系—古近系沉积形成,呈红色、深红色或褐色,主要为粒状碎屑结构和泥状胶结结构的红砂岩,其特殊的工程地质特性,导致边坡变形破坏形式的特殊性。前人开展了较多的研究工作,主要针对红砂岩物理力学参数、边坡稳定性及支护防治和边坡变形破坏的研究。如徐建平等

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