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我矿使用崩落采矿法已有二十余年的历史,在地表形成了一个长约600米、平均宽约300米的塌陷坑,汇水面积达21万平方米。加之矿区位于群山环绕的凹地之中,其东部和南部分别有2.954平方公里和169平方公里的汇水面积,每逢雨季,以上两处所接受的大气降水形成的洪水,均顺着地势流向矿区,直接威胁着塌陷坑和井下生产。1962年7月,曾降了一次特大暴雨,4小时内,降雨量达228.9毫米水柱,按汇水面积计算得的平均小时洪水量达11.9万立方米(或33米~3/秒),由于当时外部防洪设施不适应最大洪峰流量的泄洪要求,以致洪水漫越排洪沟,冲垮防洪堤,涌进塌
I have been using the Caving Mining Law for more than 20 years and have formed a collapse pit of about 600 meters in length with an average width of 300 meters on the surface. The catchment area is 210,000 square meters. Coupled with the mining area is located in the hollow surrounded by mountains, the eastern and southern areas of 2.954 square kilometers and 169 square kilometers of catchment area, each rainy season, the above two accepted by the precipitation of the floods, all along the terrain flow to the mining area , A direct threat to the collapse of pit and underground production. In July 1962, there was an extremely heavy rainfall. Within four hours, the rainfall reached 228.9 mm of water, and the average hourly flood rate by catchment area reached 119,000 cubic meters (or 33 meters to 3 seconds) At that time, external flood control facilities did not meet the flood discharge requirements of the maximum peak discharge, resulting in flooding flood discharge ditches, flood levees and influx