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《Journal of China Coal Society》 2019-02
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Research and engineering application of high pre-stressed resistance enhancement large deformation bolt in deep soft rock roadway

ZHANG Hongjun;LI Haiyan;ZHANG Taiping;WANG Qiang;WANG Wei;WANG Xin;ZHAO Hui;CHANG Tao;GUO Tianchan;Shandong Institute of Geological Sciences;Research Center of Geotechnical and Structural Engineering,Shandong University;Shandong Electric Power Engineering Consulting Institute Co.,Ltd.;College of Earth Science,Jilin University;  
In order to overcome the support problem of large deformation and the high repairing rate of deep soft rock roadway,a new type of high pre-stressed increase-resistance large deformation bolt is developed based on previous studies.It is mainly composed of pallet,metal clip,rod body 1,rod body 2,connection sleeve,cone-thimble and sliding sleeve.Initial pre-stress applied on the new bolt can reach 120 kN,the let-point-pressure can be controlled to 180-240 kN,the deformation can be adjusted flexibly within 150-1 000 mm.In the process of deformation,it can maintain a high level of increasing support resistance. Static tensile tests in laboratory show that compared with the traditional bolt,the new bolt has excellent characteristics of "first to support,then let the pressure,the last continue to support,prevent the fracture and increase the resistance". In order to further study the mechanical support mechanism of the new bolt,the CABLE unit of FLAC3 D numerical simulation software is secondarily developed by using Fish language programming,and the axial tensile mechanical behavior of large deformation bolt is simulated with high precision.Research on the deformation mechanism of a typical deep large deformation soft rock roadway-500 m hydrophobic roadway at Jinyang coal mine in China shows that the low strength of surrounding rock,high ground stress and low initial pre-stress of bolt are the main factors leading to its deformation.It has been unable to solve the outstanding contradiction among the three by using the traditional bolt support. In order to maintain the stability of roadway surrounding rock,it is necessary to strengthen the support strength for reducing the deformation rate of surrounding rock and improving the ability of supporting members to adapt to the large deformation of surrounding rock.To verify the support effect of new bolt,a new "bolt-mesh-spurting"support technology with the core of new high pre-stressed increase-resistance large deformation bolt is proposed,according to the deformation characteristics and mechanism of surrounding rock in typical deep soft rock roadway of-500 m water discharging gateway in Jinyang coal mine. Numerical simulation and field monitoring results show that the new supporting scheme can effectively improve the stress state of bolt and reduce the deformation of surrounding rock,the final deformation of surrounding rock decreases by nearly 60% compared with the original support scheme.
【Fund】: 国土资源部金矿成矿过程与资源利用重点实验室和山东省金属矿产成矿地质过程与综合利用重点实验室联合开放课题资助项目(kfkt201803);; 国家自然科学基金面上资助项目(51379114)
【CateGory Index】: TD353.6
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