地下采空区堤防工程的变形与稳定分析

Deformation and stability analysis on levee project upon underground mined area

研究地下采空区对堤防的影响是非常有实用价值的课题,本文采用D-P模型,堤防和基础采用四边形单元,通过有限元计算系统分析了采空区距堤防的间距、采空区的深度、采空区的高度、采空区上覆岩层对堤防的影响。结果表明,采空区在一定范围内对堤防有很大影响,不仅造成堤防塌陷,而且也使堤防产生不同程度的破碎裂缝,使现有堤防的完整性、密实度下降,抗滑稳定不满足要求,为此提出应根据工程的地质情况,在一定距离和一定深度范围内限制采煤、采砂。

The study on the effect from the underground mined area on the levee project upon it is a subject with practical value. The effects from the space between the levee and the mined area, the depth and height of the mined area, the covering rock layers are analyzed herein through FEM with adoption of the D-P criterion under the condition of taking quadrilateral elements for both the levee and its foundation, The result shows that the mined area has great effect on the levee within an certain area, which can not only cause the subsidence of the levee, but also can induce breaking cracks on the levee body to a certian extent, and then the original integrality and density of the levee are to be decreased with the sliding stability out of the requirement concerned. Therefore, it is put forward herein that both the coal mining and the sand ming are necessary to be limited to a certain distance and depth to the mined areas according to the engineering conditions therein concerned.