平缓反倾采动滑坡形成的地质力学模式研究——以贵州省马达岭滑坡为例

发布时间：2018-01-23 02:53

本文关键词： 边坡工程采动滑坡变形过程地质力学模式物理模拟　出处：《岩石力学与工程学报》2016年11期 　论文类型：期刊论文

【摘要】：马达岭滑坡是典型的采矿诱发型滑坡,自然斜坡为平缓反倾层状结构。以马达岭滑坡为原型,采用物理模拟方法,研究两层开采条件下采动斜坡的变形过程,并分析该类斜坡变形破坏的地质力学模式。研究表明:煤层开采后采空区边界上覆岩体产生应力集中,导致采动裂隙首先产生于该部位,以陡倾竖向倾倒式裂隙为主,裂隙向采空区中部扩展并逐渐形成离层裂隙和剪切裂隙;变形稳定后采空区上覆岩层弯曲,在地表形成沉陷区;受采空区上覆岩层沉陷的推挤作用,外侧坡体沿煤层向坡外滑移,导致坡体下部隆起。该类斜坡变形破坏的地质力学模式可以分为:弯曲拉裂("表生"改造阶段)、塑流拉裂、蠕滑拉裂3个阶段。
[Abstract]:Maoling landslide is a typical mining-induced landslide, and the natural slope is a gentle reverse layer structure. Taking the Maoling landslide as the prototype, the deformation process of the mining slope under the condition of two-layer mining is studied by using the physical simulation method. The study shows that the stress concentration of the overlying rock mass on the boundary of the goaf after coal seam mining results in the first occurrence of mining fissure in this area. Steep-dip vertical toppling fissures are the main ones, which extend to the middle of goaf and form fracture and shear fissures gradually. After the deformation is stabilized, the overlying strata in the goaf are bent, and the subsidence area is formed on the surface. Due to the pushing and squeezing of overlying strata in goaf, the lateral slope body slips out of the slope along the coal seam. The geomechanical model of deformation and failure of this kind of slope can be divided into three stages: bending and tensile fracture ("supergene" transformation stage, plastic flow tension crack, creeping sliding tension crack).
【作者单位】：成都理工大学地质灾害防治与地质环境保护国家重点实验室;四川省蜀通勘察基础工程有限责任公司;
【基金】：国家创新研究群体科学基金项目(41521002) 国家科技支撑计划(2015BAK09B01) 国家重点基础研究计划(973)资助项目(2013CB733202)~~
【分类号】：P642.22
【正文快照】： 滑坡称为采动滑坡[1],产生变形的斜坡可称为采动斜坡。20世纪以来,采空区的变形不仅导致严重的地质环境破坏[2],也诱发形成大量采动滑坡,造成了严重的人员伤亡和财产损失。如1903年4月,加拿大Alberta省Frank镇采空区变形引发体积达3 000万m3的滑坡,摧毁整个Frank镇,造成76人遇

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