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以土朱矿井煤仓硐室为例,运用松动圈理论和组合拱理论分别计算了硐室围岩稳定性系数,2种理论计算得到硐室围岩稳定性系数均大于1.1,证明了锚杆注浆联合支护设计参数符合硐室围岩安全稳定的要求.运用FLAC4.0数值模拟软件计算分析了大断面硐室围岩的稳定性,建立了无支护、锚杆支护、锚杆注浆联合支护3种模拟方案,分别分析了3种方案时硐室围岩的变形情况,模拟结果显示锚杆注浆联合支护的巷道顶底板和两帮收敛量都较小,底鼓量也较小,能保证该巷道围岩的长期稳定.最后运用工程类比法确定采用锚杆注浆联合支护方案,并通过后期现场观测,证明锚杆注浆联合支护效果良好,能够保证硐室围岩的长期安全稳定.图4,参7.
Taking the coal bunker chamber of Tuju Mine as an example, the stability coefficient of surrounding rock of cavern is calculated by using loose ring theory and combined arch theory. The stability coefficients of the surrounding rock of the two kinds of cavern are all calculated to be more than 1.1. The design parameters of grouting joint support are in accordance with the requirements of the safety and stability of the surrounding rock of the cavern.The stability of the surrounding rock of the large section chamber is calculated and calculated by using FLAC4.0 numerical simulation software.It is established that no support, Grouting joint support three kinds of simulation programs were analyzed three kinds of programs when the surrounding rock deformation, the simulation results show that the anchor grouting joint support roof and floor and the two convergence is small, the bottom drum The amount is also small, to ensure the long-term stability of the surrounding rock roadway.Finally, the use of engineering analogy to determine the use of bolt grouting joint support program, and by the late field observation proves that bolt grouting joint support effect is good, to ensure Long-term safety and stability of the surrounding rock chamber.