Study on Excavation of Water Pump House in Deep Coal Mines in Xinhe
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ORIGINAL PAPER
Study on Excavation of Water Pump House in Deep Coal Mines in Xinhe Bo Liu . Yansong Zhang
. Yuyuan Zhang . Quanli Ma . Xiangbao Meng
Received: 18 September 2019 / Accepted: 7 May 2020 Ó Springer Nature Switzerland AG 2020
Abstract The excavation and support of deep chamber has always been a difficult problem to be solved urgently. Through a case study on the 980 m deep chamber group at Xinhe coal mine of China, the present research conducts theoretical analysis on the excavation-induced failure mechanism associated with the neighboring chambers. Moreover, a suite of construction workflows are optimized based on Flac3D numerical simulation. The optimal construction workflow BA2A3A1A4A5 is determined by minimizing the damage volume VP of the plastic region subsequently. The main chamber and niche of the pump house are supported by combined support, and the non-used support is adopted in the early and late stages of the construction of the pump house. The FLAC3D numerical simulator is adopted here to model the support scheme. Results show that the chamber deformation is effectively controlled at the top, bottom, and both sides. Results from field monitoring indicate that the overall supporting effect to the roadway is decent. In order to design the mining sequence of chamber group, FLAC3D numerical simulation can be used to optimize the scheme, and the combined support method adopted by chamber group is reasonable and feasible, which can effectively
B. Liu Y. Zhang (&) Y. Zhang Q. Ma X. Meng College of Safety and Environmental Engineering, Shandong University of Science and Technology, Qingdao 266590, China e-mail: [email protected]
control surrounding rock, and has good application value. Keywords Chambers High ground stress Numerical simulation Construction scheme optimization
1 Introduction With the depletion of the shallow coal resources in China, coal mining gradually advances to deep levels (Xu et al. 2019; Zhang et al. 2018; Wang et al. 2019a, b). In a deep roadway, the stress gradually increases, and the rock properties are also subject to change. The surrounding rock is characterized as a type of soft rock under certain stress conditions. Soft rock engineering has become an essential engineering problem associated with modern deep coal mining (Ainabinder et al. 2008). For deep soft rock chambers, e.g., water tanks, electromechanical chambers, pump rooms, permanent refuge chambers, etc., the rheological characteristic of soft rock will subject the soft rock to creep driven by long-term high ground stress after a longtime service. Consequently, chambers will eventually undergo converging deformation. Therefore, the stability of the deep soft rock chamber cannot be maintained by the traditional support method (Cai
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Geotech Geol Eng
Fig. 1 The top-down schematic diagram of the pump room layout
et al. 2004; He et al. 2019; Li 2016; Liu et al. 2017; Du et al. 2019; Feng and An 2004). To address the aforementioned issue, the pr
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