Abstract
As coal resources trapped under surface buildings in the Wangtaipu coal mine area impede the efficient mining of coal seams and constrain the sustainable development of coal mines, a super-high-water roadway backfill mining technique for preventing building damage was adopted. According to the control principle and theoretical calculations, an engineering design was established including the reasonable width of segment coal pillars in the working face and technical parameter design. The monitoring results after the implementation of the scheme showed that building deformation was controlled within grade I, protecting the surface buildings. A reasonable roadway design parameter was achieved, with a surface subsidence of 27 mm and horizontal deformation of 0.3 mm/m, indicating that it can ensure the safety of surface buildings from the State Bureau of Coal Industry. The practical trial can provide a reference for the extraction of coal resources under similar conditions and is vital for the sustainable development of the mining industry and economic growth.
Highlights
China is the largest coal producer in the world due to progressive expansion of various energy-based programs
The practical trial can provide a reference for the extraction of coal resources under similar conditions and is vital for the sustainable development of the mining industry and economic growth
As is well-known, coal exploitation will lead to many serious eco-environmental problems, such as surface building damage, destruction of groundwater resources, and exhaust emissions, which are a global problem [2,3,4,5]
Summary
China is the largest coal producer in the world due to progressive expansion of various energy-based programs. Based on the importance of coal in China’s energy resources, long-term rapid technological and economic development can be guaranteed [1]. 13.7 billion tons of coal reserves trapped under surface buildings, water bodies, and railways (hereinafter referred to as “under-three”) in China, among which coal resources under surface buildings account for 9.5 billion tons [6,7]. At present, according to the present situation of coal trapped under surface buildings in the Wangtaipu coal mine, the total amount has reached 30 million tons, which affects the succession of subsequent mining, and wastes coal resources and is not conducive to sustainable development of the coalmine. Under the premise of protecting surface buildings, it is important to liberate coal resources under surface buildings and other structures
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