锦屏二级水电站1#,3#引水隧洞TBM施工预测与施工效果对比分析  

COMPARISON OF TBM PERFORMANCE PREDICTION WITH ACTUAL TBM OPERATION RESULTS IN HEADRACE TUNNELS NO.1 AND NO.3 OF JINPING Ⅱ HYDROPOWER STATION

作　　者：龚秋明[1] 王继敏[2] 佘祺锐[1] 

机构地区：[1]北京工业大学城市防灾与减灾教育部重点实验室,北京100124 [2]二滩水电开发有限责任公司,四川成都610051

出　　处：《岩石力学与工程学报》2011年第8期1652-1662,共11页Chinese Journal of Rock Mechanics and Engineering

基　　金：国家自然科学基金资助项目(50878009)

摘　　要：TBM施工预测在隧道施工方法选择、项目规划、施工规划、施工管理中发挥了很大的作用。针对锦屏二级水电站引水隧洞TBM施工,在获得隧洞沿线岩体参数及岩体所处环境参数的基础上,对TBM施工段的岩体进行分区分段,应用挪威科技大学(NTNU)TBM施工预测模型、岩体特性TBM施工预测模型对各段TBM掘进速度进行预测,应用NTNU滚刀寿命预测模型及CAI(cerchar abrasivity index)值对刀具磨损进行预测。通过TBM掘进试验结果与预测结果的对比分析,讨论目前预测模型存在的问题。对TBM施工过程中收集到的岩体特性、TBM运行参数及运行结果进行分析,并与预测结果进行对比,对2种结果的差别进行详细研究。总体而言,TBM掘进速度预测是可行的,但在高地应力作用下,TBM预测模型有待进一步改进。由于高地应力作用与岩爆的影响,刀具的异常破坏过多,刀具的磨损预测不是很理想。Tunnel boring machine（TBM）performance prediction has played an important role in the selection of construction method,project planning,construction planning and management.Headrace tunnels No.1 and No.3 of Jinping II Hydropower station were excavated respectively by two tunnel boring machines.On the base of the obtained information of rock masses conditions and rock masses environmental conditions,such as in-situ stress and groundwater condition along the tunnel alignments,the rock mass was sectioned according to the influence of key factors on TBM excavation.NTNU and rock mass characteristic TBM performance prediction models were used to predict the penetration rate.And NTNU cutter life mode and CAI value were used to predict the cutter wear.By comparing the results of in-situ TBM penetration tests with the prediction penetration rates,the applicability and errors of these penetration rate prediction models were discussed.During TBM construction process,the rock mass conditions,TBM operation parameters,TBM operation results were collected and analyzed.The actual rock mass conditions and excavation results were compared with the rock mass conditions obtained for TBM performance prediction and predicted TBM performance results.The reasons of making the difference were studied.Generally,the penetration rate prediction is reliable in most cases.But in the condition of high in-situ stress,these TBM penetration rate prediction models need to be modified.Due to the influence of the high in-situ stress and rock bursts,the abnormal cutter failure is too much.Thus,the predicted results for cutter life are not good.

关 键 词：岩石力学 施工预测模型 岩体特性 岩体分段 高地应力 TBM 

分 类 号：TU45[建筑科学—岩土工程]