Modeling and Simulation of Deformation Mechanism of Soft Rock Roadway considering the Mine Water

Yanlong Chen,Peng Wu,Xianbiao Mao,Hai Pu,Liang Chen,Deyu Qian,Qiang Li,Kai Zhang,Xuyang Shi,Fabien Magri

doi:10.1155/2020/8812470

Yanlong Chen, Peng Wu + Show 8 more

Open Access

https://doi.org/10.1155/2020/8812470

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Abstract

The existence of coal mine water has an important influence on the instability of soft rock roadway in mining engineering. Considering the effect of mine water, a case study on the fracture mechanism and control technology of soft rock roadway was performed in this paper. The results showed that with the increase of moisture content, the uniaxial compressive strength of mudstone nonlinearly decreased, while the tensile strength, Young’s modulus, cohesion, and friction angle tended to a linear decrease approximately. Meanwhile, with the increase of the weakening coefficient, the axial force of the anchorage body increased gradually, while the maximum shear stress decreased gradually. With the increase of moisture content, the failure zone was further propagated into the deep surrounding rock, resulting in a larger stress relaxation around the roadway, especially in the roof and floor. Finally, the supporting technology of the roadway was proposed, and then its support principle, design process, and parameters were also analyzed in detail. The field monitoring data showed that the support technology can control the surrounding rock deformation effectively and maintain the long-term stability of the roadway.

Highlights

Coal resources play an important role in the energy structure, accounting for more than 70% of the total resources in China
With the increasing intensity of coal mining and the exhaustion of shallow coal resources, the coal mining depth gradually increases at a speed of 10 m to 25 m per year [1]
Engineering data have indicated that deep soft rock roadway accounts for about 28%-30% of the total roadways, the repair rates are as high as 70% [4, 5]

Summary

Introduction

Coal resources play an important role in the energy structure, accounting for more than 70% of the total resources in China. The low compressive and shear strength and the development of joints and cracks have important influences on the large deformation of the soft rock roadway [15, 16]. These studies have shown that the failure mechanism of soft rock roadway is related to the geological condition, in situ stress state, and rock mass parameters and closely related to roadway size and section shape. The new waterproof supporting method was proposed to support the roadway

Engineering Properties of the Soft Roadway

Sandy mudstone

Establishment of a Numerical Simulation Model

Failure Mechanism of Water-Dripping Mudstone Roadway

Findings

Conclusions