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李    春

（廣西交科集團(tuán)有限公司，廣西 南寧 530007)

摘   要： 為研究跨溶巖區(qū)域隧道位于掌子面前方的溶洞在隧道開挖過程中對隧道的影響規(guī)律，本文依托吾 排隧道實(shí)際工程，利用 FLAC 3D 軟件進(jìn)行數(shù)值建模與計算，分析不同圍巖級別、溶洞水壓下隧道圍巖在施工過 程中的穩(wěn)定性影響規(guī)律 ，得到以下結(jié)論： (1) 在隧道開挖過程中，圍巖級別越高，相同開挖步對應(yīng)的最大主應(yīng)力與最小主應(yīng)力值越大，圍巖的變形位移值越小； 溶洞水壓越大，相同開挖步對應(yīng)的最大主應(yīng)力與最小主應(yīng)力值越大，圍巖的變形位移值越大。(2) 拱頂位置處的應(yīng)力在開挖前期小幅波動，而后迅速增大再急劇減小 ，墻 腳位置處的主應(yīng)力值在開挖前期保持相對穩(wěn)定 ，而后變化率逐漸增大，仰拱位置處主應(yīng)力值在開挖前期基本保持不變，然后急劇增長； 拱頂、仰拱位置處的位移在前期緩慢增加，開挖到一定深度時開始急劇增長。

關(guān)鍵詞： 跨溶巖區(qū)域隧道； 圍巖穩(wěn)定性； 數(shù)值計算； FLAC 3D

中圖分類號：U455      

文獻(xiàn)標(biāo)志碼：A      

文章編號：1005-8249 (2023) 03-0004-07

DOI : 10. 19860/j.cnki.issn1005-8249.2023.03.004

LI Chun

( Guangxi Transportation Science & Technology Group Co. ，Ltd. ，Nanning , 530007 China)

Abstract: In order to study the influence law of the cavern in front of the palm face of the tunnel in the tunnel excavation process, this paper relies on the actual project of the Wu Pai tunnel, and uses FLAC3D software for numerical modeling and calculation to analyze the stability influence law of the tunnel surrounding rock in the construction process under different rock levels and cavern water pressure, and obtains the following conclusions: (1) In the tunnel excavation process, the higher the level of the surrounding rock, the greater the maximum principal stress and minimum principal stress values corresponding to the same excavation step, the smaller the deformation and displacement values of the surrounding rock; the greater the cavern water pressure, the greater the maximum principal stress and minimum principal stress values corresponding to the same excavation step, the greater the deformation and displacement values of the surrounding rock. (2) The stress at the top of the arch fluctuates slightly at the beginning of the excavation, then increases rapidly and then decreases sharply; the primary stress at the foot of the wall remains relatively stable at the beginning of the excavation, then the rate of change increases gradually; the primary stress at the back of the arch remains unchanged at the beginning of the excavation, then increases sharply; the displacement at the top of the arch and back of the arch increases slowly at the beginning, then starts to increase sharply when the excavation reaches a certain depth.

Keywords : tunnel across karst area; stability of surrounding rock ; numerical calculation; FLAC 3D

?基金項(xiàng)目： 廣西科學(xué)研究與技術(shù)開發(fā)計劃項(xiàng)目（桂科攻 1355008-3) 。

作者簡介： 李春  (1974—) , 男，碩士，高級工程師，從事公路設(shè)計和科研工作。 

收稿日期： 2023-02-15