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王亞奇

（河南省交通規劃設計研究院股份有限公司 ，河南 鄭州 450000)

摘   要： 為了研究超大斷面隧道臨近溶洞掌子面開挖的圍巖突水失穩破壞特征，本文以武深高速李洞隧道為背景 ，利用 FLAC 3D 數值模擬軟件建立了數值計算模型 ，分別分析了圍巖應力 、位移 、塑性區和涌水量等關鍵因素隨隧道開挖的變化規律 ，研究了溶洞水壓對隧道圍巖穩定性的影響規律 。研究結果表明： (1) 當掌子面 距離前方巖溶隧道小于 6 m 時，掌子面與溶洞之間的圍巖應力最大值達到 6. 32 MPa, 掌子面最大位移迅速增大至約 200~ mm; (2) 當掌子面距離溶洞- 18 m~ -8 m 時 ，隧道掌子面涌水量處于 200 m3/h 以下 ，當掌子面距離溶溶洞水壓呈指數式增長關系 ，掌子面開挖遇前方有溶洞應采取疏水降壓以及補強掌子面巖體的措施。 

關鍵詞： 超大斷面隧道； 溶洞； 突水失穩； 破壞特征

中圖分類號： U452. 1      

文獻標志碼： A      

文章編號： 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

?基金項目： 國家自然科學基金  (51608490) 。

作者簡介： 王亞奇  (1984—) , 男 ，碩士 ，高級工程師 ，主要研究方向： 巖土工程勘察。 

收稿日期： 2023-07-20