Damage Analysis of Soaking Gypsum and Safety Evaluation of Goaf: Based on Energy Dissipation Theory
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ORIGINAL PAPER
Damage Analysis of Soaking Gypsum and Safety Evaluation of Goaf: Based on Energy Dissipation Theory Xiaoding Xu . Xuebin Cui . Xue Liu . Qiongqiong Tang Yanhua Sun
. Xiaohu Zhang .
Received: 8 May 2020 / Accepted: 13 June 2020 Ó Springer Nature Switzerland AG 2020
Abstract Based on the theory of energy dissipation, the energy dissipation model of gypsum rock was established, and we analyzed the energy dissipation law of four stages (compaction stage, elastic stage, plastic stage, and failure stage) of gypsum rock failure process with different soaking time. The results show that: the energy of the system (total strain energy, releasable elastic strain energy and dissipative strain energy) changes dynamically. The total strain energy and releasable elastic strain energy decrease with the increase of soaking time. The growth rate is also negatively related to soaking time, while the dissipative strain energy is positively related to soaking time. Then, based on the geological characteristics and test data of gypsum mine in Northern Jiangsu Province, X. Xu Q. Tang (&) College of Construction Engineering, Jilin University, Changchun 130026, China e-mail: [email protected] X. Xu X. Cui X. Zhang State Key Laboratory for Geomechanics and Deep Underground Engineering, China University of Mining and Technology, Beijing 100083, China X. Xu X. Liu State Key Laboratory of Coal Resources and Mine Safety, China University of Mining and Technology, Xuzhou 221008, Jiangsu, China X. Zhang Y. Sun School of Civil Engineering, Guizhou University of Engineering Science, Bijie 551700, China
FLAC3D software was used to simulate the stability of goaf under natural and saturated conditions respectively. The simulation results show that the plastic area of goaf was not obvious and the stability was good under natural conditions. In the state of water saturation, most of the area was completely penetrated by the plastic area, the pillar was seriously unstable, which endangers the safety of the goaf. Keywords Gypsum rock Energy Dissipation Goaf Stability Numerical simulation
1 Introduction Due to unreasonable mining exploration, there are potential safety hazards in the large area of the ultrahigh and ultra-wide mining, and the gypsum mine has been abandoned for a long time without supervision and maintenance, resulting in a large number of river water and rain into the mine. The goaf has been in a state of water soaking for a long time, resulting in endless collapse events, which has brought huge losses to people’s lives and properties. Thus, it is important to study the damage of water to gypsum rock and its influence on the stability of goaf of gypsum mine. At present, scholars have carried out some related theoretical research and achieved some results. In 1974, Louis first proposed rock hydraulics, which was then widely used in engineering practice
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Geotech Geol Eng
Fig. 1 Test samples
(Louis 1974). Dyke. C.G concluded that the bulk density, i
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