| The ground subsidence and ground fissures were found in the south western part of Madang village of Sandaohu town of Jingyu county. Local villagers have been affected because some lands were unfit for farming and some cracks occurred in many houses near the ground subsidence. For the above reason, it is very important that researching the cause of the ground fissures and predict its trend. The author of this thesis determines that the ground subsidence and ground fissures were caused by the goaf ,that caused lowering ground water, a large area of goaf, of Longma coal mine through investigation and analysis.This thesis calculates surface deformation and predicts its trend through probability integral method. The main contents in this thesis are as follow:(1) This thesis expounds situation of the land subsidence and ground fissures and the geological environment of Madang village of Sandaohu town of Jingyu county, these laid the foundation for researching on the land subsidence.(2) This thesis expounds the developmental features and the phenomenon of ground failure of the ground fissures, and determines that the land subsidence and ground fissures were caused by the goaf ,that caused lowering ground water, a large area of goaf, of Longma coal mine through investigation and analysis. Just because that level deformation at the edge of the land subsidence were bigger, ground fissures appeared there.(3) This thesis calculates surface deformation through probability integral method, and determines whether surface deformation had exceeded the anti-deforming capability of ground building from the following three aspects, namely, level deformation, curvature, tilt value, and then predicts the degree of ground failure.(4) This thesis suggests that the measure of filling the ground fissures and of fortifying the building should be adopted for reducing the harm on plowland, budding and the life and property of local people caused by the ground fissures. |
