贵州开阳县龙井湾崩塌地质灾害评估及防治

Evaluation and prevention of rock fall in Longjingwan,Guizhou Province

龙井湾崩塌是磷矿开采引发和加剧的,龙井湾沟谷分布有崩塌6处。文章通过对崩塌区地质环境的勘查,阐述了该区的地质构造、岩性条件、水文地质条件及当前存在的采空区范围及特点,继而采用概率法对采空区上覆的岩体稳定性进行分析,得出了磷矿层的开采将在其上方相应的地表造成一定的变形与移动的结论,阐明了该区崩塌产生的机理,评估了崩塌体的引发和加剧对磷石膏堆场工程的危害性,提出了禁采区范围、清理危岩体(壁)等防治的工程措施。

There are six rock falls in the Longjingwan guUey exploitation. By investigating geological environment of the and they were caused and aggravated by the phosphorite phosphorite area, expatiating geologic setting, lithology, hydrogeological condition, the range and characteristic of the current mined-out area, adopting the probabilistic approach to analyze the stability of the rock masses which cover the goaf, reaching a conclusion that exploiting phosphorite can cause the displacement and deformation of the earth＇ s surface over the mined-out area, clarifying the mechanism of the rock fall, and evaluating the harmfulness caused by rock fall to the phosphogypsun stock project. Besides, the engineering claims the measure of the prevention including the range of non-mining field and clearing the instable rock （cliff）.