The Prediction Of Subsidence In Coal Mining Area Of Hanglaiwan Field

Area of Shaanbei is one of China’s important energy and chemical industry base, whichis rich in coal, oil, natural gas and other resources. But it is located in the arid and semi-aridareas, the ecological environment is fragile. However, after the coal mining, the overburdenand surface occur in various forms destruction, thus triggering a series of seriousgeological-environmental problems and threat to life and property safety of residents.Therefore, the study of surface movement and deformation laws, and the expected range anddegree of movement and deformation are important to the development of environmental andgeological mine.In this paper, the basis of the data collection and field measurement, the fieldinvestigation combine with indoor comprehensive analysis, discussed the mechanism of coalmining subsidence and distribution, take30101woking face in Hanglaiwan for example,use of probability integration method for surface movement and deformation caused bymining were predicted. Through research, obtained the following results:(1) Through field investigation and laboratory analysis revealed the deformation ofground movement caused by coal mining in the region. Investigation of21cracks growththere, they are substantially parallel to135°, the width of the existence of grading; severehousing subsidence damage;(2) Calculated according to previous experience with the caving zone， fractured zoneand height of protective layer is33.60~42.40m,85.87~107.02m,16.80~21.20m, theiraverages are38m,96.45m,19m; to discuss the mechanism of coal mining subsidence inHanglaiwan field with geological conditions and the conditions of mining;(3) Geological, hydrogeological conditions of the area and buried coal, combined withmining engineering, mining subsidence mechanism is central to determining the miningsubsidence prediction parameters needed to create a predictive model probability integrationmethod, the district the mining subsidence predicted. The use of measured data to predict fieldresults were verified, indicating that carried coal mining subsidence prediction usingprobability integration method is feasible and reliable. The prediction results show: thetheoretical maximum subsidence is7.17m, the maximum tilt deformation is68.9mm/m, themaximum horizontal deformation of31.42mm/m, through the measured and calculatedsimulation, border angle is68.9°, angle of displacement is70.4°, the crack angle is89°, thesubsidence range of movable basin is2.193km2; (4) By studying the hydrogeological conditions and the measured data, the3rd coalmining on the major aquifers-Salawusu Formation aquifer has little effect, but has someinfluence on Yan’an Formation aquifer and Zhiluo Formation aquifer; to protect Hong Shi Xiawater resources, should left1000m terrestrial protected areas of protective coal pillar, thedirection is from the Tou Dao River to Hanglaiwan field. Meanwhile, proposed the preventionand control measures of mining subsidence hazard.The research results to the exploitation of other extents of Hanglaiwan field and otherfield in area of Shaanbei which has similar reference, while for the energy and chemical basein northern Shaanxi environmental protection and sustainable development provides a basis.