| 灰岩隧道掘进机隧道点荷载试验评价岩石强度方法的研究与探讨 |
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| 引用本文： | 刘泉声,赵怡凡,张晓平,孔晓璇.灰岩隧道掘进机隧道点荷载试验评价岩石强度方法的研究与探讨[J].岩土力学,2018,39(3):977-984. |
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| 作者姓名： | 刘泉声 赵怡凡 张晓平 孔晓璇 |
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| 作者单位： | 武汉大学 土木建筑工程学院，湖北 武汉 430072 |
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| 基金项目： | 国家重点基础研究发展计划（973）项目（No.2014CB046904，No.2015CB058102）。 |
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| 摘 要： | 使用隧道掘进机（TBM）开挖隧道时刀盘和盾体阻碍了对岩石状态的观察，这时可使用岩渣对岩石条件进行预测和评价。从滚刀破碎掌子面产生的岩渣中选取块状岩石进行点荷载试验可以获得岩石强度，但是受过滚刀损伤作用的岩石强度值与未受损伤的岩石强度值之间的关系尚不明确。从吉林引松供水工程TBM破岩产生的岩渣中挑选块状试样进行点荷载试验，同时在产生岩渣的相应位置钻取岩芯获取点荷载强度，与单轴抗压强度进行了对比，记录了取样地点地质状态、试样的尺寸、破碎状态以及等效断裂面积。结果表明：岩渣中的岩块受到滚刀作用产生的损伤强度值有所下降，为完整取芯试样的63.25%，原岩越完整受损程度越大；灰岩点荷载强度换算岩石单轴抗压强度系数约为25.3，直接使用岩渣时建议系数约为42.1；峰值荷载与等效断裂面积成正比；尺寸过大的试块往往与岩体原有裂隙有关，强度极低，不适宜用作点荷载试验。研究结果为TBM隧道现场快速获取岩石强度参数提供了方法和依据。
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| 关 键 词： | 隧道掘进机（TBM） 岩渣 点荷载 损伤 引松供水工程 |
| 收稿时间： | 2016-07-20 |
Study and discussion on point load test for evaluating rock strength of TBM tunnel constructed in limestone |
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| LIU Quan-sheng,ZHAO Yi-fan,ZHANG Xiao-ping,KONG Xiao-xuan.Study and discussion on point load test for evaluating rock strength of TBM tunnel constructed in limestone[J].Rock and Soil Mechanics,2018,39(3):977-984. |
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| Authors: | LIU Quan-sheng ZHAO Yi-fan ZHANG Xiao-ping KONG Xiao-xuan |
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| Institution: | School of Civil Engineering, Wuhan University, Wuhan, Hubei 430072, China |
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| Abstract: | When using tunnel boring machine (TBM) to excavate a tunnel, engineers are hindered to observe the state of surrounding rock by the cutter-head and shield of TBM. Under this circumstance, the state of rock muck can be used to predict and evaluate rock mass conditions as well. The strength of blocky fragments in TBM muck can be obtained by the point load test. However, the relationship between blocky fragments and the intact surrounding rock has been unknown. In this study, point load tests are performed on the blocky fragments selected from the Yinsong Water Supply Project. Meanwhile, rock core samples are taken by drilling at corresponding locations of blocky fragments. Their strengths are also measured by point load tests, and then compared with uniaxial compressive strengths. In addition, geological conditions, the size of specimens and the breaking state are also recorded. The results show that the point load strength of blocky fragments reduces to 63.25% of core samples from side walls. It is found that the reducing ratio is greater when rock mass is more complete. The conversion factor from point load strength to uniaxial compressive strength for limestone is 25.3, whereas the conversion factor from the point load strength of blocky fragments to uniaxial compressive strength is 42.1. The breaking force depends on the breaking surface and oversize blocky fragments are not suitable for testing the strength. In conclusion, this study provides a useful method and basis for the rapid acquisition of rock strength in TBM tunnelling. |
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| Keywords: | tunnel boring machine (TBM) blocky fragments point load strength damage Yinsong Water Supply Project |
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