基于复杂地形的等高线FLAC模拟矿区沉陷预计

Prediction of Mining Subsidence Based on FLAC Simulation of Complex Terrain

为减小模型误差对FLAC模拟开采活动造成的影响,提高FLAC模拟的可靠性和精度,本文以大柳塔矿区52304工作面为例,针对复杂丘陵矿区高差过大导致In-SAR数据误差大的问题,建立基于地表等高线的复杂FLAC模型,并将模拟下沉结果结合In-SAR数据与GPS测得的下沉线曲线对比分析。结果表明:(1)FLAC在模拟煤层开挖时,上覆不规则表面的模型可以产生与实际情况相吻合的下沉盆地,验证了等高线复杂模型的可靠性;(2)在FLAC模拟中,等高线复杂模型可以减小模型误差;(3)使用模拟得到的数据和GPS数据计算下沉特征角值并进行对比,以此验证了模拟结果的可靠性;(4)通过与In-SAR的监测结果对比可以发现,FLAC模型具有边缘效应,模拟结果与In-SAR数据互补可以提高精度。

In order to reduce influence of model error on FLAC simulation caused by mining activities, improve the reliability and ac- curacy of FLAC simulation, based on the 52304 working face of Daliuta mining area as an example, according to the height of the hill mining area due to the large complex problem of large error of In - SAR data, the establishment of complex surface contour based on FLAC model. And the simulation results were compared with the GPS data measured by the In - SAR data. The results shows as fol- lows ： （1）the FLAC in the simulation of coal seam excavation, overlying the irregular surface model can produce is consistent with the actual situation of the subsidence basin, verify the reliability of the model of complex contour; （2）in the FLAC simulation, the complex contour model can reduce the model error; （3）the use of simulated data and GPS data calculation of subsidence angle and compared to verify the reliability of the simulation results ; （4）through the comparison with the monitoring results of the In - SAR can be found, the FLAC model has the edge effect, the simulation results and the In - SAR data can improve the accuracy of complementary.