PDF全文阅读

王亚奇

（河南省交通规划设计研究院股份有限公司 ，河南 郑州 450000)

摘   要： 为了研究超大断面隧道临近溶洞掌子面开挖的围岩突水失稳破坏特征，本文以武深高速李洞隧道为背景 ，利用 FLAC 3D 数值模拟软件建立了数值计算模型 ，分别分析了围岩应力 、位移 、塑性区和涌水量等关键因素随隧道开挖的变化规律 ，研究了溶洞水压对隧道围岩稳定性的影响规律 。研究结果表明： (1) 当掌子面 距离前方岩溶隧道小于 6 m 时，掌子面与溶洞之间的围岩应力最大值达到 6. 32 MPa, 掌子面最大位移迅速增大至约 200~ mm; (2) 当掌子面距离溶洞- 18 m~ -8 m 时 ，隧道掌子面涌水量处于 200 m3/h 以下 ，当掌子面距离溶溶洞水压呈指数式增长关系 ，掌子面开挖遇前方有溶洞应采取疏水降压以及补强掌子面岩体的措施。 

关键词： 超大断面隧道； 溶洞； 突水失稳； 破坏特征

中图分类号： U452. 1      

文献标志码： A      

文章编号： 1005-8249 (2023) 06-0025-06

DOI : 10. 19860/j.cnki.issn1005-8249.2023.06.004

 

WANG Yaqi

( Henan Provincial Communications Planning & Design Institute Co. ，Ltd. ，Zhengzhou 450000 , China)

Abstract: In order to study the large cross section tunnel near the cave of the water inrush of the surrounding rock excavation instability destruction features, Lidong tunnel of Wushen highway was taken as the background in this paper. Numerical model is established by numerical simulation software FLAC 3D, and the key factors the stress, the plastic zone, displacement and water inflow change rule of the surrounding rock with tunnel excavation was analyzed. The influence of water pressure on the stability of tunnel surrounding rock is studied. The results show that: (1) when the distance between face and karst tunnel is less than 6 m, the maximum stress of surrounding rock between face and karst tunnel reaches 6.32 MPa, and the maximum displacement of face increases rapidly to about 200 mm. (2) When the distance between the face of the tunnel and the cave is -18 m~-8 m, the water inflow of the tunnel face is less than 200 m3/h. When the distance between the face of the tunnel and the cave is -8 m~-2 m, the water inflow rapidly increases to 7371 m3/h, which is bound to cause water inrush accident. (3) Both the maximum displacement and water inflow of the tunnel face increase exponentially with the water pressure of the cave. When there is a cave in front of the tunnel face during excavation, measures should be taken to drain water and depressurize the rock mass of the tunnel face.

Keywords : super large section tunnel; karst cave ; water inrush instability; failure characteristics

∗基金项目： 国家自然科学基金  (51608490) 。

作者简介： 王亚奇  (1984—) , 男 ，硕士 ，高级工程师 ，主要研究方向： 岩土工程勘察。 

收稿日期： 2023-07-20