浅埋地铁隧道软质围岩分级研究

发布时间：2018-01-29 08:05

本文关键词： 隧道工程软质围岩围岩分级浅埋地铁隧道纵波波速　出处：《公路》2014年08期 　论文类型：期刊论文

【摘要】：浅埋隧道软质围岩性质与深埋隧道岩体有很大的差异,现有针对浅埋隧道的岩体质量分级评价方法尚不完善,对浅埋隧道软质围岩质量分级的研究具有一定的价值。以南京地铁二号线苜蓿园段隧道工程为依托,对浅埋隧道软质围岩的基本力学特性和影响其稳定性的因素进行了分析研究,采用工程岩体分级标准BQ法、岩体地质力学RMR分级系统对其进行围岩分级,对研究区围岩按其基本指标做出定量化评分、分级,并以岩体纵波波速单因素分级法作为参考和对比,通过综合分析,得到隧道岩体质量综合分级结果。研究了这3种方法应用于浅埋隧道围岩中的特点和使用方法,并分析研究了3种分级方法分级结果之间的相关关系和产生差异的原因。
[Abstract]:The nature of soft surrounding rock in shallow buried tunnel is very different from that in deep buried tunnel, and the existing classification evaluation method of rock mass quality for shallow tunnel is not perfect. It is valuable to study the quality classification of soft surrounding rock in shallow buried tunnel, which is based on the alfalfa garden tunnel project of Nanjing Metro Line 2. The basic mechanical characteristics of soft surrounding rock in shallow tunnel and the factors affecting its stability are analyzed and studied. The engineering rock mass classification standard Bq method and the rock mass geomechanics RMR classification system are used to classify the surrounding rock mass. The surrounding rock in the study area is graded quantitatively according to its basic index, and the single factor classification method of longitudinal wave velocity of rock mass is used as reference and contrast, through comprehensive analysis. The comprehensive classification results of tunnel rock mass quality are obtained. The characteristics and application methods of these three methods in shallow tunnel surrounding rock are studied. The correlation between the results of the three classification methods and the reasons for the difference were analyzed.
【作者单位】：华杰工程咨询有限公司;南京大学地球科学与工程学院;
【分类号】：U452.12
【正文快照】： 隧道按照其埋置深浅划分,可以分为深埋和浅埋两大类。城市地铁隧道大部分是浅埋的。浅埋岩石隧道的围岩的特点有如下几个方面。(1)浅埋隧道多贴近地表,因全球地表70%以上为沉积岩覆盖,所以浅埋地铁隧道多数分布于沉积岩中,其成岩年代相对较新,软质岩石比例较大,从其结构而言,

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