本文選題：隧道施工技術(shù)　切入點：注漿　出處：《山東大學(xué)》2017年碩士論文

【摘要】：胡麻嶺隧道第三系富水弱成巖粉細砂巖地段隧道施工難度巨大,第三系富水弱成巖粉細砂巖地層在開挖擾動后自穩(wěn)能力差,掌子面極其不穩(wěn)定,現(xiàn)場施工過程中極易發(fā)生小型坍塌,涌水涌砂頻發(fā),初支易變形、沉降量大。第三系富水弱成巖粉細砂巖遇水后工程力學(xué)特性發(fā)生很大改變。通過土工試驗,對第三系富水弱成砂巖的工程力學(xué)特性及不同含水率情況下抗剪強度的變化進行研究。為破解施工難度大提供解決問題的方向。現(xiàn)場實測了胡麻嶺隧道圍巖松動圈的大小,在第三系富水弱成砂巖地層,圍巖松弛帶厚度達到4m,為制定第三系粉細砂巖圍巖止水加固提供直接的參數(shù)。本文結(jié)合胡麻嶺隧道4號斜井挑高段的施工,對在胡麻嶺隧道施工中創(chuàng)新采用的施工工法進行了詳細的介紹。胡麻嶺隧道第三系富水弱成巖粉細砂巖地層中隧道施工,創(chuàng)新性的采用了超前HCH-I高分子注漿材料替代了傳統(tǒng)的注漿材料水泥漿及水泥漿-水玻璃雙漿液。通過對隧道巖體超前預(yù)注HCH-I高分子材料,很好的加固了圍巖,封閉出水點。第三系富水弱成巖粉細砂巖滲透系數(shù)小,降水難度,掌子面降水時部分砂巖隨著水流失造成支護背后空洞嚴(yán)重時甚至?xí)ёo失穩(wěn),胡麻嶺隧道在世界范圍內(nèi)首次將深井降水技術(shù)引入到山嶺隧道施工降水中。通過在隧道頂部山體建設(shè)降水深井,成功的降低了隧道所在位置的水頭,同時在隧道內(nèi)部采用臺階輕型井點降水及超前水平真空降水,共同為隧道施工提供安全保障。在隧道挑高段施工中,選擇了斜井直接進入正洞橫向貫通單側(cè)喇叭狀挑高的施工方案。通過多種創(chuàng)新性的工法工藝,為胡麻嶺隧道第三系富水弱成巖粉細砂巖隧道施工提供了一個安全的施工環(huán)境。胡麻嶺隧道第三系砂巖地層隧道施工中采用的工法工藝,對在地層環(huán)境類似開展的同類工程,有很大的推廣價值。
[Abstract]:It is very difficult to construct the tunnel in Humaling tunnel, which is rich in water and weak diagenetic fine sand rock. The formation of water rich and weak diagenetic fine sand rock of the tertiary system has poor self-stability after excavation disturbance, and the face of palm is extremely unstable.It is easy to occur small-scale collapse in site construction process, water gushing sand frequent, the initial branch is easy to deform, and the amount of settlement is large.The engineering mechanical properties of Tertiary water-rich weak diagenetic silty sand rock changed greatly.Based on the geotechnical tests, the engineering mechanical properties of the Tertiary water-rich and weakly formed sandstone and the variation of shear strength under different moisture content are studied.In order to solve the construction difficulties to provide a solution to the problem.The size of surrounding rock loose circle of Humaling tunnel is measured on the spot. In Tertiary water-rich and weak sandstone formation, the thickness of surrounding rock relaxation zone is up to 4 m, which provides direct parameters for the formulation of water sealing and strengthening of Tertiary fine silt rock surrounding rock.Combined with the construction of the No. 4 inclined shaft in Humaling Tunnel, this paper introduces in detail the innovative construction method used in the construction of Humaling Tunnel.In the construction of the tunnel in the Tertiary water rich and weak diagenetic fine sand strata, the advanced HCH-I polymer grouting material was used to replace the traditional grouting material cement slurry and cement slurry-water glass double slurry.Through the advance injection of HCH-I polymer material to the tunnel rock mass, the surrounding rock is well strengthened and the water point is closed.The permeability coefficient of Tertiary water-rich weak diagenetic fine silty sand rock is small, the precipitation is difficult, and some sandstones even lose stability when the water loss results in serious voids behind the support.For the first time in the world, the deep well dewatering technology has been introduced into the mountain tunnel construction precipitation.Through the construction of deep well of dewatering on the top of the tunnel, the water head in the tunnel position is reduced successfully, and the step light well point dewatering and the leading level vacuum dewatering are adopted in the tunnel interior, which provides the safety guarantee for the tunnel construction together.In the construction of the high section of the tunnel, the construction scheme of the inclined shaft directly entering the main hole is chosen.Through a variety of innovative engineering techniques, this paper provides a safe construction environment for the construction of the Tertiary water-rich and weakly diagenetic silty sand tunnel in Huamaling Tunnel.The engineering technique used in the construction of the tertiary sandstone formation tunnel in the Humaling Tunnel has great value in popularizing the similar projects carried out in the formation environment.
【學(xué)位授予單位】：山東大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：U455.4

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