China University of Mining and Technology (CUMT)

China Shenhua Energy Company Limited

Chn Energy Investment Group Co., Ltd

Zhiguo Cao

Quansheng Li

Liu Han

Shuzhao Chen

Dazhao Gu

Sushe Chen

Provided herein is a method for constructing a pumping-injection well of a groundwater reservoir in a dump of an open-pit mine. The pumping-injection well includes a bottom pipe, intermediate pipes, and a top pipe in sequence from bottom to top connected from bottom to top. The method includes: arranging a rubble barrier around the pumping-injection well, and installing the bottom pipe of the pumping-injection well at a designed position of the pumping-injection well as a center of circle; continuing to install an intermediate pipe on the bottom pipe, and pile up a rubble pile; continuing to stack multiple intermediate pipes, and starting the construction of the groundwater reservoir; discarding discarded materials from the open-pit mine to form a dump; continuing to stack intermediate pipes to build an inverted trapezoidal surface sump around the pumping-injection well; and installing the top pipe and a well cover to form a complete pumping-injection well.

Method for constructing pumping-injection well of groundwater reservoir in dump of open-pit mine

The present disclosure provides an artificial dam of a distributed coal mine underground reservoir and its constructing method. The artificial dam comprises a support layer (), an anti-seepage layer (), and a concrete structure layer () that are successively formed in an auxiliary roadway () from inside to outside, the concrete structure layer () being embedded into a security coal pillar () and/or surrounding rock () around the auxiliary roadway (). Because the concrete structure layer () is embedded into the security coal pillar () and/or the surrounding rock () around the auxiliary roadway (), the artificial dam is combined to the security coal pillar () to together form a dam for an underground reservoir. Due to multi-layer design, anti-seepage performance and structural strength of the dam can meet the water storage requirements of the underground reservoir.

Artificial dam of distributed coal mine underground reservoir and its constructing method

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Beijing, China

Zhiguo Cao