深井井底车场高地应力硐室群稳定性分析

Analysis on Stability of High Ground Stressed Chamber Group in Deep Mine Shaft Bottom

针对淮南朱集煤矿井底车场中央水泵房这一深埋大断面大规模高地应力松软围岩硐室群的长期稳定性问题,通过数值模拟研究了水泵房开挖、支护后围岩变形和应力场分布特征,采用振弦式混凝土应变计、钢筋应力计、压力盒监测水泵房二次衬砌,获取了二次衬砌混凝土应变、钢筋应力、二次衬砌所受压力的演化规律,分析评价了水泵房围岩稳定性和钢筋混凝土二次衬砌受力状态及其稳定性。数值模拟结果与现场监测结果吻合较好,研究结果表明:一次支护和二次衬砌支护后,泵房围岩变形收敛稳定,二次衬砌受力状态良好,所受最大围岩压力为62.5 MPa,安全可靠,钢筋应力值、混凝土应变均未超过强度值。

according to the long term stability problem of the deep large cross section and high ground stress chamber group with soft surrounding rocks for the central water bumping room in the mine shaft bottom of Zhuji Mine in Huainan, the numerical simulation was applied to study the surrounding rock deformation and stress filed distribution features after the excavation and support of the water bumping room. The vibrating wire type concrete strainometer, the reinforced bar stress gauge and the pressure cell were applied to monitor and measure the secondary lining of the water bumping room, the evolution laws of the secondary concrete liner strain, the reinforced bar stress, the secondary liner pressure were obtained and the surrounding rock stability of the water bumping room and the loading status and stability of the reinforced concrete secondary liner were analyzed and evaluated. The numerical simulation results could be well fitted with the site monitoring and measuring results. The study results showed that after the primary support and the secondary liner support, the deformation and convergence of the bumping room surrounding rock were stable, the loading status of the secondary liner was excellent and the max surrounding rock pressure was 62. 5 MPa, safe and reliable. The stress value of the reinforced bar and the strain of the concrete was not over the strength value.