本文關(guān)鍵詞： 巖溶隧道 頂部溶洞 溶洞水壓 突水通道 安全厚度　出處：《隧道建設(shè)》2017年02期 　論文類型：期刊論文

【摘要】：巖溶地區(qū)地質(zhì)條件復(fù)雜,在隧道修建中存在溶洞突涌水安全隱患,而頂部溶洞帶來的災(zāi)害性更加明顯,溶洞水壓是其重要影響因素。針對隧道頂部溶洞,建立數(shù)值模型,將溶洞水壓作為工況因素,分析圍巖中的孔隙水壓力變化規(guī)律,揭示隧道開挖過程中突涌水通道的分布情況�；跀�(shù)值模型中單元孔隙水壓力突變最大值判斷方法,溶洞與掌子面圍巖達(dá)到塑性狀態(tài)后,監(jiān)測兩者之間的單元孔隙水壓力隨開挖步變化速率,找出每一行單元中的最大值,從而確定不同溶洞水壓下的突水通道及安全厚度。研究表明,隨著頂部溶洞水壓增大,突水通道距離溶洞底部由近及遠(yuǎn),而安全厚度也隨之增大。
[Abstract]:The geological conditions in karst area are complex, and there is a hidden danger of water gushing in the tunnel construction, and the disaster caused by the top karst cave is more obvious. The water pressure of the karst cave is an important influence factor. A numerical model is established for the karst cave at the top of the tunnel. The variation of pore water pressure in surrounding rock is analyzed to reveal the distribution of water gushing channel during tunnel excavation. Based on the method of determining the maximum value of unit pore water pressure in numerical model, the variation of pore water pressure in the surrounding rock is analyzed. After the plastic state of the cavern and the surrounding rock on the face of the face is reached, the variation rate of pore water pressure between them with the excavation step is monitored, and the maximum value in each row of the unit is found out. The results show that with the increase of water pressure at the top of the cave, the water inrush passage is near and far away from the bottom of the cave, and the safe thickness increases with the increase of the water pressure of the top cave.
【作者單位】： 武漢港灣工程質(zhì)量檢測有限公司;海工結(jié)構(gòu)新材料及維護(hù)加固技術(shù)湖北省重點(diǎn)實(shí)驗(yàn)室;
【分類號(hào)】：U457.2

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1 焦一帆;關(guān)于溶洞水滴自動(dòng)監(jiān)測采樣系統(tǒng)的研究[D];云南大學(xué);2015年

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