浅埋红黏土隧洞围岩含水率迁移研究及地层结构反演分析

发布时间：2018-01-11 08:09

本文关键词：浅埋红黏土隧洞围岩含水率迁移研究及地层结构反演分析　出处：《岩石力学与工程学报》2014年S2期 　论文类型：期刊论文

【摘要】：浅埋软土隧道围岩的含水率对围岩的力学性质有直接影响,对围岩的稳定性至关重要。以地质雷达对围岩中水较为敏感的特性为思路,从河南巩登高速公路隧道掌子面采集红黏土,压实土样并调节实验样品的含水率从10%至30%,并以多种频率的地质雷达波扫描测试,建立红黏土的含水率和地质雷达波速的关系,进而建立含水率与介电常数的关系。应用这一思路,通过连续多次监测,由地质雷达扫描数据得到围岩含水率分布,预测围岩的力学参数及其变化情况,揭示隧道开挖区域含水率分布及其力学参数随着开挖过程的进行而发生的迁移变化等规律,对隧道围岩稳定性做出快速量化评估。
[Abstract]:The moisture content of the surrounding rock of shallow soft soil tunnel has direct influence on the mechanical properties of surrounding rock and is very important to the stability of surrounding rock. The red clay was collected from the face of the tunnel of Gongdeng Expressway in Henan Province. The soil samples were compacted and the moisture content of the experimental samples was adjusted from 10% to 300.The geological radar wave scanning test was carried out with various frequencies. The relationship between the water content of red clay and the wave velocity of GPR is established, and the relationship between water content and dielectric constant is established. The distribution of water content of surrounding rock is obtained from the scanning data of geological radar, and the mechanical parameters of surrounding rock and its variation are predicted. The distribution of water content in tunnel excavation area and the law of migration and change of mechanical parameters with the excavation process are revealed, and the stability of surrounding rock of tunnel is evaluated quickly and quantitatively.
【作者单位】：西安理工大学土木建筑与工程学院;
【基金】：国家自然科学基金资助项目(51179153,11002108,51308456)
【分类号】：U451.2
【正文快照】： 1引言精确测定土质围岩含水量对土质隧洞施工过程中的稳定性有重要意义。土质隧洞中土壤含水量的变化不仅影响土体的强度和变形特性,而且还会直接影响隧洞的稳定性、地表的沉陷、地下水的流动等[1-2]。目前常用的土壤含水量测定方法有烘干法、中子仪法、γ射线法、时域反射仪T

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