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隧道工程TBM施工中广泛遇到软硬复合地层,TBM刀具作用下软硬互层岩体破坏特征与均质岩体存在较大差异。采用RMT-301刚性试验机,对不同软硬互层组合下的类岩石板状试样进行了楔刀贯入破坏试验,并对试验过程进行了声发射和高速摄像监测,探讨了掘进轴向上软硬互层因素对TBM刀具破岩效果的影响。试验结果表明:刀具破岩的难易不仅与刀具直接作用层岩石性质有关,同时还受作用层与承压层岩石强度比值的影响;板状试样的剥落破坏区反映了刀具作用下试样的压塑区,作用层相同而承压层岩石越软时,作用层岩石将在垂直于刀具贯入方向上具有更大的破碎范围;板状试样的声发射事件平面定位点具有聚集分布的特点,聚集区亦表现出随承压层材料由相对较硬到相对较软而有垂直于刀具加载方向发展的趋势,表明声发射平面定位结果的聚集分布较好地反映了试样内部的损伤劣化情况。
Hard and soft composite strata are widely encountered in tunneling TBM construction. The failure characteristics of soft and hard interbedded rock mass under the action of TBM tool are quite different from that of homogeneous rock mass. Using the RMT-301 rigid testing machine, the wedge piercing test was carried out on the rock-like plate samples with different layers of soft and hard interlayers. The acoustic emission and high-speed camera monitoring of the testing process were carried out. Influence of Hard and Soft Interlayer on TBM Cutting Rock Breaking. The test results show that the difficulty of rock breaking is not only related to the rock properties of the direct action layer of the tool but also influenced by the ratio of the rock strength of the action layer to the confined layer. The spalling failure zone of the plate specimen reflects the influence of the tool Of the compression zone, the role of the same layer and the lower the pressure rock layer, the action layer of rock perpendicular to the penetration direction of the tool has a larger crushing range; plate-shaped sample of acoustic emission event plane anchor point has an aggregation distribution The aggregation zone also shows the trend that the material of the pressure-bearing layer develops from the relatively hard to the relatively soft and perpendicular to the tool loading direction, indicating that the aggregation distribution of the acoustic emission plane positioning results better reflect the internal Damage deterioration.