为提高新集二矿1煤回采上限以及为水害防治提供依据，对新集二矿地质资料充分分析，采用UDEC 7.0进行数值模拟试验，模拟工作面推进时底板发育情况，得出工作面推进至120 m，底板达到最大破坏深度19.3 m。采用并行电法对煤层地板岩层破裂过程进行现场监测，通过观察电阻率变化趋势，判断岩体的形变过程，确定煤层采动破坏带深度为19.6 m。结果表明， 数值模拟结果与电法测试结果基本一致，底板破坏带以下为底板岩层保护带，保护带以下岩层完整性较好，可以起到一定的隔水作用。研究成果对相似地质条件下的承压水上开采研究具有重要意义。

 In order to improve the upper limit of No.1 coal mining in Xinji No.2 Mine and provide a basis for water disaster prevention and control, the geological data of Xinji No.2 Mine were fully analyzed. UDEC 7.0 was used for numerical simulation test to simulate the development of floor when the working face was advancing. It was concluded that when the working face advanced to 120 m, the floor reached the maximum failure depth of 19.3 m. The parallel electrical method was used to monitor the fracture process of coal seam floor strata. By observing the change trend of resistivity, the deformation process of rock mass was judged, and the depth of coal seam mining failure zone was determined to be 19.6 m. The results showed that the numerical simulation results were basically consistent with the electrical test results. The bottom of the floor failure zone was the protective zone of the floor rock layer. The integrity of the rock layer below the protective zone was good and could play a certain role in water insulation. The research results were of great significance to the study of confined water mining under similar geological conditions.