基于盾构掘进参数的岩石可切割性模糊识别  

FUZZY RECOGNITION FOR ROCK CUTTABILITY BASED ON SHIELD DRIVING PARAMETERS

作　　者：宋克志[1] 孙树贤[1] 袁大军[2] 王梦恕[2] 

机构地区：[1]鲁东大学岩土工程重点实验室 [2]北京交通大学隧道及地下工程试验研究中心,北京100044

出　　处：《岩石力学与工程学报》2008年第S1期3196-3202,共7页Chinese Journal of Rock Mechanics and Engineering

基　　金：中国博士后科学基金资助项目(20060400670)

摘　　要：基于重庆越江隧道盾构掘进参数和模糊识别原理,对岩石的可切割性进行研究。对典型泥岩和砂岩进行现场点荷载强度试验,利用数据采集、存储系统,获取与典型泥岩和砂岩相应的盾构刀盘推力及掘进速率,并运用多元回归分析方法建立典型泥岩和砂岩地层下的盾构掘进速率预测模型,并构建盾构掘进速率特性空间,依据岩性对空间进行划分,用掘进速率表征相应岩石的可切割性。将样本岩石的掘进速率与典型岩石的掘进速率之差定义为距离,利用模糊识别原理,建立掘进速率与归一化距离的对应关系,获得样本岩石掘进速率对典型岩石的掘进速率的隶属度,从而建立岩石可切割性识别函数。重庆越江隧道沿线围岩以泥岩、砂岩及泥岩夹砂岩交互变化为特征,属于软岩～中硬岩系列,岩石软硬变化范围不是很大。因此,将岩石可切割性划分为软、中软及中硬三个级别,对掘进过程中岩石的可切割性进行识别。识别结果是隧道施工阶段工程地质勘察报告的有益补充,增强了盾构掘进控制的科学性和准确性,为预测刀具磨损和确定换刀时机提供了科学的参考依据。Based on shield driving data at Chongqing Yangtze River tunnel and fuzzy diagnosis principle,rock cuttabilities are studied. Point load strength tests of representative mudstone and sandstone in field are carried out. Thrust force and penetration rate(PR) of shield corresponding to the representative mudstone and sandstone are recorded by data acquisition and storage system of shield. Based on multivariate regression analysis,corresponding prediction models of penetration rate are developed,and then the attribution spaces of shield penetration rate are constructed and divided according to rock properties. Rock cuttabilities are flagged by corresponding PR of shield. Making use of fuzzy diagnosis principle,difference between PR in a rock sample and PR in representative rock is defined as a conception of distance. The correspondence between PR and normalized distance is developed. Membership of PR in a rock sample to PR in representative rock is acquired subsequently. Consequently,recognition function for rock cuttabilities is constructed. The rocks along the tunnel are characterized as alternation of mudstone,sandstone and mudstone containing sandstone. These rocks are all subordinate to the range of soft rock to medium hard rock,and the scope of their hardness is not too wide. So the rock cuttabilities are divided into three levels as soft,medium soft and medium hard,based on which the rock cuttabilities along the tunnel is recognized. Results of the rock cuttabilities are beneficial supplements for engineering geology surveying reports during construction;and these results have provided scientific references for predicting the cutter wear and deciding the time of the cutter exchange. When the shield is advancing,accuracy control of shield has too been improved.

关 键 词：隧道工程 盾构 掘进参数 岩石可切割性 掘进速率 模糊识别 

分 类 号：U455.43[建筑科学—桥梁与隧道工程]