本文選題：隧道工程 + 飽水土質隧洞��； 參考：《巖石力學與工程學報》2014年S1期

【摘要】：基于新疆庫尉引水隧洞現(xiàn)場監(jiān)測資料,對飽水土質隧洞變形特性及影響因素進行深入分析。根據(jù)其主導影響因素將土質隧洞的變形分為3個階段:橫向空間效應影響階段→縱向空間效應+時間效應影響階段→時間效應階段,橫向空間效應影響為開挖時出現(xiàn)塌方、冒頂?shù)闹饕蛩?可通過超前支護、減小橫向空間面積等方式降低其影響;縱向空間效應+時間效應主導著第二階段的變形,其合理的分離可為參數(shù)反演提供依據(jù);第三階段的時間效應主要為流變變形。對不同埋深、圍巖類型以及支護強度影響下監(jiān)測的變形數(shù)據(jù)的分析可知:低液限粉(黏)土整體性較好,主要發(fā)生與埋深有較大關系的形變變形,埋深越大,變形越大,且具有一定的流變特性;粉土夾砂層和粉細砂夾礫石排水量大,開挖過程中易發(fā)生小范圍塌方,其變形主要以洞周一定范圍內的松動變形為主,且與夾砂層的位置有較大關系,埋深對其變形影響不顯著,在采取強支護措施及分步開挖方式下,監(jiān)測到的變形量值均較小。支護結構在拱頂和邊墻部位的變形特性有很大差異:拱頂變形穩(wěn)定時間短,變形量小;低液限粉(黏)土圍巖邊墻處圍巖塑性區(qū)范圍隨埋深增大,應力釋放時間效應明顯,形變壓力不斷增長,收斂變形量大。對于土質隧洞,鋼拱架在限制圍巖變形方面比鋼格柵更為顯著,考慮造價等因素,應根據(jù)不同地質條件、埋深合理選擇支護方式。
[Abstract]:Based on the site monitoring data of the Xinjiang reservoir diversion tunnel, the deformation characteristics and influencing factors of the saturated soil tunnel are deeply analyzed. According to the leading influence factors, the deformation of the soil tunnel is divided into 3 stages: the lateral spatial effect influence phase, the longitudinal space effect + time effect phase and the time effect phase, the lateral spatial effect. The main factors of collapse and roof fall should be influenced by the way of overbearing and reducing the lateral space area. The longitudinal space effect + time effect dominates the deformation of the second stage, and the reasonable separation can provide the basis for the parameter inversion; the time effect of the third stage is mainly rheological deformation. The analysis of the deformation data under the influence of the type of surrounding rock and the strength of the support shows that the low liquid limit powder (clay) has a better integrity, and the deformation is mainly related to the buried depth, the greater the depth, the greater the deformation and the certain rheological properties, and the great drainage of the silt and the fine sand pebbles, and it is easy to occur during the excavation. The deformation of the small range is mainly due to the loosening and deformation in the certain scope of the hole, and it has a great relationship with the position of the sand layer. The deformation of the buried depth has little influence on the deformation. The deformation of the supporting structure is very poor in the vault and the side wall. The deformation of the vault is short and the deformation is small. The plastic zone range of surrounding rock at the surrounding wall of the low liquid limit powder (clay) soil increases with the depth of the burial depth, the stress release time effect is obvious, the deformation pressure increases and the convergent deformation is large. For the soil tunnel, the steel arch frame is more significant than the steel grid in limiting the deformation of the surrounding rock, and the cost should be considered. According to different geological conditions, the support method should be chosen rationally.

【作者單位】： 西安理工大學巖土工程研究所;
【基金】：國家自然科學基金資助項目(51179153)
【分類號】：U455.49

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本文編號：1839855