高水平应力巷道连续“双壳”治理底臌实验研究

基于深井工程软岩巷道严重底臌这一状况,以河北陶二煤矿扩大区北大巷条件为工程背景,对连续"双壳"如何有效控制深井软岩巷道底臌进行了实验研究。通过现场地应力测量、解算,确定了巷道围岩应力状态,采用自行设计的双向加载试验台,进行深井软岩巷道不同侧压系数时底板围岩变形失稳特征的相似模拟实验,得到底板位移场变化规律及围岩应力分布状态。模拟实验结果表明:底板连续"双壳"加固巷道底臌量较原支护巷道平均减小53%;底板浅孔注浆(浅部壳体)提高岩体承载能力,深孔锚索束注浆(深部壳体)扩大岩体承载范围,浅深壳体共同承载、协同变形有效控制了底板围岩稳定。最后揭示了连续"双壳"治理底臌机理。

Experimental research on the continuous “double shell” harnessing floor heave in high horizontal stress roadway

Based on the fact that floor heave in deep soft-engineering rock roadway is quite serious，we made a experimental research on how the continuous “double shell” to effectively control the floor heave in deep soft-engineering rock roadway by taking the situation of north roadway in the Taoer mineral enlarge area as the background.Through the in-situ stress measurement and decoding，the stress state of surrounding rock of roadway was determined.Using self-designed bidirectional loading test bench，we made similar simulation experiment on the deformation and instability characteristics of the surrounding rocks in the deep well soft tunnel under the different pressure coefficient.The stimulation experiment results show that：the amount of floor heave is reduced by an average of 53% with continuous double-shell strengthening floor from the origin supporting of roadway；the short-hole grouting in the floor(shallow-shell) improves bearing capacity of surrounding rock，the long-hole grouting in the floor(deep-shell) expanding the scope of the rock mass load，the common bearing and cooperative deformation of the shallow-deep-shell effectively controlling the stability of floor rock.The result reveals the governance mechanism of floor heave continuous double shell.