摘要
以雅康高速公路飞仙关隧道集中涌水为典型事例,通过大量的地表调查、综合测试,分析研究了该红层公路隧道涌水量巨大、排泄时间长的原因以及高压涌水的机理。隧址区所位于的"撮箕"型倾末向斜构造以及富水、隔水相间的岩性组合是巨量地下水汇集、径流和排泄的基础,此种控水模型的地下水在隧道开挖中产生的排泄廊道具有非对称性,且水头压力高、排泄时间长。基于大量水化学成果测试的宏量组分的聚类分析成果对地下水的来源和径流通道与隧址区的控水模型进行了相互印证,并结合施工台架变形特征分析印证了相应地下水的压力。该隧道由于涌水压力大、瞬时流量高,衰减时间长,虽为红层软岩隧道,但隧道施工中所表现的地下水特征具有红层地下水的非典型性,对红层地区类似工程地下水的认识具有参考意义。
Taking the concentrated water gushing in Feixianguan Tunnel of Ya’an-Kangding Expressway as a typical example,in this paper,the reason for huge water inflow,long discharge time in the red bed tunnels and the mechanism of the high pressure water inflow are analyzed and studied after many surface investigations and comprehensive experiments.A huge amount of groundwater accumulation,runoff and discharge are based on two main aspects,the location of this tunnel is a’dustpan’end-dipping synclinal structure and the water-rich layers alternate with the water-isolated layers lithological assemblage.The mutual corroboration of groundwater resource and runoff channel with the water control model is conducted based on the clustering analysis result of macroscopic components from a large number of hydro-chemical experiments,and the pressure of the corresponding groundwater is analyzed and corroborated by the transformation characteristics of the construction platform.Even though this tunnel lays in the red bed soft rocks,the groundwater characteristics presented in the construction process are atypical red bed groundwater characteristics because of high water inflow pressure,high instantaneous flow and long attenuation time,which provides reference for further projects to recognize the characteristics of similar engineering groundwater conditions in red layer area.
作者
邵江
SHAO Jiang(Sichuan Highway Planning,Survey,Design and Research Institute Ltd.,Chengdu 610031,China)
出处
《公路》
北大核心
2020年第2期294-300,共7页
Highway
基金
四川重点交通科技项目资助,项目编号2013C10-2.
关键词
红层岩体
隧道
高压涌水
机理
分析
red bed
tunnel
high pressure water
mechanism
analysis
