Abstract
In this study, the deformation characteristics and mechanical properties of coal and rock mass in the S2N5 working face of the Xiaokang coal mine are analyzed to address the problem of large deformation of soft rocks with high in situ stress surrounding roadways. Through a newly developed grouting pipe, a double-shell grouting technology, consisting of low-pressure grouting and high-pressure split grouting, is proposed for the Xiaokang coal mine. In addition, the effect of grouting is evaluated by borehole peeping and deformation monitoring. The results show that the double-shell grouting technology can effectively improve the overall mechanical properties of the surrounding coal and rock mass, preventing the large deformation and failure of the roadway. This technology can be useful when analyzing and preventing large deformation of soft rock roadways.
Highlights
Controlling the soft rock strata surrounding roadways is important when conducting mining activities [1, 2]
To control the large deformation of soft rock roadways, it has become necessary to support them with bolt/cable + steel mesh + shotcrete technology [3, 4]
Li. et al proposed a coupling support technology consisting of a high-toughness sealing layer + hollow grouting cables + full-length anchoring bolts in deep boreholes to effectively control the large deformation of roadways [10]
Summary
Controlling the soft rock strata surrounding roadways is important when conducting mining activities [1, 2]. Li. et al analyzed the failure mechanism of a large span intersection through numerical simulation and proposed a double-bolt control technology to effectively control the deformation of the surrounding rock in roadways [9]. Li. et al proposed a coupling support technology consisting of a high-toughness sealing layer + hollow grouting cables + full-length anchoring bolts in deep boreholes to effectively control the large deformation of roadways [10]. Wang et al put forward the concept of “high strength, integrity, and decompression” based on the large deformation mechanism of soft rock surrounding a roadway and developed a confined concrete (CC) support system, which was verified by field tests [12]. Section double arch synergy reinforcement technology of “sprayed concrete + grouting + anchor bolt + anchor cable” to control the deformation of inclined shaft in soft surrounding rock [13]. The field application of double-shell grouting technology is achieved using a newly developed grouting conduit and good results are obtained
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