With the mining depth increase in Yaoqiao Coal mine in Datun mine area, various nonlinear mechanics damages are appeared, which can seriously affect the safety production.
大屯矿区姚桥煤矿进入深部开采后，出现各类非线性力学破坏现象，严重影响巷道的正常使用。
At Yaoqiao coal mine, once and successful shaft washing using hydrochloric acid is made in the drillhole aquifer stuffed by the Permian system Taiyuan group NO. 4 lime, good result has been obtained.
姚桥煤矿通过对二叠系太原组四灰含水层被堵塞钻孔和裂隙发育不畅钻孔利用盐酸洗井，一次洗通，取得了良好的效果。
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