基于水文地质综合勘察的隧道导水特性研究
Study on Water Diversion Characteristics of Tunnel Based on Hydrogeological Comprehensive Investigation
程小勇1
作者信息
- 1. 广东省交通规划设计研究院集团股份有限公司,广州 510507
- 折叠
摘要
深埋特长隧道是高速公路建设中的关键控制性工程,查明水文地质条件和准确预测涌水量是保证施工安全的重要前提.本文以拟建的深圳外环高速公路三期工程田头山隧道为例,采用水文地质测绘、物探、钻探、水文地质试验和室内试验相结合的水文地质综合勘察方法,对隧道围岩分段分级、富水段落划分、涌水量预测等方面进行了分析研究.隧道经过向斜轴部地段,为良好的储水构造,富水段落集中在K84+680～K84+840,预测在施工时将产生大涌水,将此范围洞身段划为V级围岩,判定为主要导水岩体;隧道受断裂构造影响,富水段落中的断层带及宽张裂隙将会成为重要导水通道.进一步,在获取隧址区典型深度段岩体的渗透系数后,分别采用降水入渗系数法、裘布依理论式及古德曼经验式对隧道涌水量展开预测,表明水文地质综合勘察方法可以很好地评估隧道导水特性及估算涌水量.
Abstract
Deep-buried long tunnel is a key control project in highway construction.Identifying hydrogeological conditions and accurately predicting water inflow are important prerequisites for ensuring construction safety.This paper takes the Tiantoushan tunnel of the third phase project of Shenzhen outer ring expressway as an example,and uses the hydrogeological comprehensive survey method combining hydrogeological surveying and mapping,geophysical prospecting,drilling,hydrogeological test and indoor test to analyze and study the segmentation and classification of tunnel surrounding rock,the division of water-rich sections,and the prediction of water inflow.The tunnel passes through the synclinal axis section,which is a good water storage structure.Geophysical exploration also shows that the water-rich section is concentrated in K84+680～K84+840.It is predicted that large water gushing will occur during construction.The tunnel section in this range is divided into V-level surrounding rock,which is determined as the main water-conducting rock mass.At the same time,the tunnel is affected by the fracture structure,and the fault zone and wide tensile cracks in the water-rich section will become important water-conducting channels.Furthermore,after obtaining the permeability coefficient of the rock mass in the typical depth section of the tunnel site,the tunnel water inflow is predicted by using the precipitation infiltration coefficient method,the Dupuit theoretical formula and the Goodman empirical formula respectively,indicating that the hydrogeological comprehensive survey method can well evaluate the tunnel water conductivity characteristics and estimate the water inflow.
关键词
深埋特长隧道/水文地质条件/综合勘察技术/涌水量估算Key words
deep-buried long tunnel/hydrogeological conditions/comprehensive survey technology/water inflow estimation引用本文复制引用
出版年
2024
NETL
NSTL
万方数据