The Influence of Mining Floor Damage by Using Porosity of Rock Mass as the Damage Variable

 

Hailong Li

State Key Laboratory for Geomechanics & Deep Underground Engineering, China University of Mining & Technology, School of Mechanics and Civil Engineering, China University of Mining & Technology
Xuzhou, Jiangsu 221008, China;e-mail: hailongcumt@126.com

Haibo Bai

State Key Laboratory for Geomechanics & Deep Underground Engineering, China University of Mining & Technology, School of Mechanics and Civil Engineering, China University of Mining & Technology, Xuzhou, Jiangsu 221008, China, e-mail: hbbai@126.com

Yang Jiao

School of Mechanics and Civil Engineering, China University of Mining & Technology; Xuzhou, Jiangsu 221008, China, e-mail: jy19880103@126.com

Cheng Yang

School of Mechanics and Civil Engineering, China University of Mining & Technology; Xuzhou, Jiangsu 221008, China, e-mail: yangchengcumt@126.com

 

 ABSTRACT

In order to study the damage on the mining working face, the research, through establishing the foundation of transformation control of the rock stratum and the foundation of aqueous phase flow control, combing cui-bustin porosity model, adding the material porosity as the damage variable, considering the transformation of rock stratum, water-solid seepage and water-solid mass exchange, applying Gurson porosity damage-yield criterion, utilizing the comsol multiphyscis value simulation software to solve the water-solid coupling mathematical model data, comparing the changing pattern of the plastic zone of the simulated floor with the damage of the floor under the traditional Mohr-Coulomb yield criterion and testing by the real results of the flood-pot experiment, got the following results: the depths of damage of the floor under the new model and the traditional model are 19m and 15m respectively, the results of the flood-pot experiment is between 19m-19.5m. Therefore, the new model which using the rock mass porosity as the damage variable and utilizing Gurson porosity damage-yield criterion will obtain more accurate results.

Keywords: Failure depth of floor; Fluid-solid coupling; Numerical simulation; Damage-yield criterion; Water injection test

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