楔刀作用下软硬互层岩体贯入破坏试验研究

发布时间：2018-04-21 13:43

本文选题：隧道掘进机 + 声发射　；参考：《岩土力学》2017年07期

【摘要】：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。
[Abstract]:The failure characteristics of soft and hard interbedded rock mass under the action of soft and hard composite strata are quite different from those of homogeneous rock mass in tunnel engineering TBM construction. Using RMT-301 rigid testing machine, the wedge-knife penetration failure test was carried out on rock-like plate-like specimens with different soft and hard interlaminar combinations, and acoustic emission and high-speed camera monitoring were carried out during the test process. The influence of axial soft and hard interlayer on the rock breaking effect of TBM tool is discussed. The test results show that the difficulty of cutting tool rock breaking is not only related to the rock properties of the cutting tool's direct action layer, but also affected by the ratio of the rock strength of the action layer to the bearing layer, and the flaking and failure zone of the plate specimen reflects the compression plastic zone of the specimen under the action of the tool. When the action layer is the same and the bearing layer rock is softer, the action layer rock will have a larger fracture range perpendicular to the cutting tool penetration direction, and the acoustic emission event plane location point of the plate specimen will have the characteristics of aggregation and distribution. The accumulation area also shows a trend of development perpendicular to the loading direction of the tool with the relatively hard to relatively soft confined layer materials, indicating that the aggregation distribution of the acoustic emission plane localization results well reflects the damage deterioration in the specimen.
【作者单位】：武汉大学土木建筑工程学院岩土与结构工程安全湖北省重点实验室;中国科学院武汉岩土力学研究所岩土力学与工程国家重点实验室;
【基金】：国家重点基础研究发展计划(973)项目(No.2015CB058102,No.2014CB046904)~~
【分类号】：TU45

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