A rock mechanics calculation model for identifying bed separation position and analyzing overburden breakage in mining
- PDF / 2,595,011 Bytes
- 17 Pages / 595.276 x 790.866 pts Page_size
- 16 Downloads / 166 Views
ORIGINAL PAPER
A rock mechanics calculation model for identifying bed separation position and analyzing overburden breakage in mining Jiang-hui He 1 & Wen-ping Li 1 & Wei Qiao 1 Received: 9 February 2018 / Accepted: 20 August 2020 # Saudi Society for Geosciences 2020
Abstract During coal seam mining, the overlying rock can deform, break, and produce a large number of fractures, including horizontal and vertical fractures; the horizontal fractures are also known as bed separation. A bed separation water disaster (BSWD) is a destructive release of roof water, and preventing BSWDs requires accurate location of bed separation positions. A calculation model for overburden deformation and fracture analysis during mining is therefore needed. First, the deformation and breakage area of overlying rock above an active mining face were reduced to a triangular overburden deformation area (TODA), based on the results of similar material simulation experiments. Second, the hierarchy comparison merging method (HCMM) was proposed to analyze the combination and separation of rock layers in the overlying strata. The triangular calculation model (TCM), which can be used to identify bed separation locations and analyze overlying strata breakage, was then obtained by combining TODA with HCMM, and the discriminant principle and related calculation formulas of the model were given. Finally, the model was applied and validated using a mining case, showing that the TCM is a practical tool for analyzing bed separation position and overburden breakage during mining. Keywords Overburden . Triangular arch . Hierarchy comparison . Triangular calculation model (TCM) . Bed separation . Deformation analysis
Introduction China continues to undertake large-scale coal exploitation and thus faces an ongoing risk of coal seam roof water disasters. A bed separation water disaster (BSWD) is a relatively recent type of roof water disaster. It has resulted in several major underground disasters during mining operations. For example, on May 21, 2005, a BSWD accident occurred at the Haizi coal mine in Huaibei, killing five people. On July 18, 2011, the mixture of water and gas ejected from the #10414-2 gas drainage hole of the 10414 mining face in Yangliu coal mine was initiated by bed separations in overlying rock (Wang 2013; Xu et al. 2014). On April 25, 2016, 11 people died in a BSWD accident at Zhaojin coal mine in Tongchuan. Accurately Responsible Editor: Amjad Kallel * Jiang-hui He [email protected] 1
School of Resources and Geosciences, China University of Mining and Technology, Xuzhou 221116, China
locating potential bed separation positions is essential to preventing this type of water disaster. Bed separation is a layered cavity formed during the deformation and failure of overlying rock. Therefore, in order to prevent BSWD, it is necessary to analyze the deformation and failure processes of overlying strata during mining. Bed separation occurs after the overburden is disturbed by mining, so overburden deformation and failure after mining should
Data Loading...
