富水蝕變巖隧道施工穩(wěn)定性分析
本文選題:富水 切入點:全風(fēng)化花崗巖 出處:《石家莊鐵道大學(xué)》2014年碩士論文 論文類型:學(xué)位論文
【摘要】:本文以貴廣高鐵賀州段東科嶺隧道為工程背景,研究富水、風(fēng)化蝕變花崗巖地層的工程特性及隧道穩(wěn)定性特點。飽和全風(fēng)化花崗巖地層由于水的存在使得圍巖軟弱易流坍,,洞室自穩(wěn)能力很弱。針對這種地層的隧道施工,非常有效的一種方法是先進行降水,再進行隧道開挖。 通過采用流固耦合理論的計算方法,使用FLAC3D數(shù)值模擬手段,考慮降水前后CD法和核心土法,分析比較隧道施工引起的地表沉降、洞周位移和支護結(jié)構(gòu)內(nèi)力。降水前因為各項位移指標(biāo)都較大,且變形速率也較大,不能使用核心土法施工,可以采用CD法施工,但是施工效率低下;采用降水井降水后CD法和核心土法的計算結(jié)果相差較小,且都能滿足施工穩(wěn)定性要求,考慮施工方便性應(yīng)采用核心土法施工。 在不降水的情況下,若要采用核心土法施工應(yīng)對圍巖進行加固,本文研究了合理的注漿加固圈厚度得出了合理的加固圈厚度為2.5m,再以2.5m合理的注漿加固圈厚度為基準(zhǔn)研究合理的注漿加固范圍,得出合理的注漿加固范圍角為以隧道中心為圓心的拱頂240°范圍,此時隧道的各項位移和應(yīng)力指標(biāo)都滿足要求,且再增大注漿圈厚度和范圍角后對控制位移以及應(yīng)力的效果已經(jīng)不明顯。
[Abstract]:In this paper, the engineering characteristics and tunnel stability characteristics of water-rich and weathered altered granite strata are studied in the engineering background of Dongkeling Tunnel in Hezhou Section of Gui-Guang High Speed Railway. The saturated fully weathered granite strata are weak and prone to flow and collapse due to the presence of water. For tunnel construction in this kind of stratum, one of the most effective methods is to first dewatering and then to excavate the tunnel. The surface settlement caused by tunnel construction is analyzed and compared by using the fluid-solid coupling theory and the FLAC3D numerical simulation method, considering the CD method and the core soil method before and after precipitation. The displacement around the hole and the internal force of the supporting structure. Before precipitation, because of the large displacement index and the large deformation rate, the core soil method can not be used for construction, but the construction efficiency is low. The calculation results of CD method and core soil method after dewatering are small and can meet the requirements of construction stability. Considering the convenience of construction, the core soil method should be adopted. In the case of no precipitation, if the core soil construction should be used to strengthen the surrounding rock, In this paper, the reasonable thickness of grouting reinforcement ring is studied. The reasonable thickness of reinforcing ring is 2.5 m, and then the reasonable grouting reinforcement range is studied based on 2.5 m reasonable thickness of grouting reinforcement ring. It is concluded that the reasonable angle of grouting reinforcement range is 240 擄with the center of the tunnel as the center of the arch, and all the displacement and stress indexes of the tunnel meet the requirements. The effect of increasing the thickness and range angle of grouting ring on controlling displacement and stress is not obvious.
【學(xué)位授予單位】:石家莊鐵道大學(xué)
【學(xué)位級別】:碩士
【學(xué)位授予年份】:2014
【分類號】:U455.49
【參考文獻】
相關(guān)期刊論文 前10條
1 吉小明;王宇會;;隧道開挖問題的水力耦合計算分析[J];地下空間與工程學(xué)報;2005年06期
2 吉小明;;隧道工程中水力耦合問題的探討[J];地下空間與工程學(xué)報;2006年01期
3 孫少銳;吳繼敏;魏繼紅;陳吉森;;大跨度雙連拱隧道開挖滲流場特征研究[J];勘察科學(xué)技術(shù);2005年06期
4 劉仲秋;章青;;巖體中飽和滲流應(yīng)力耦合模型研究進展[J];力學(xué)進展;2008年05期
5 邢彭齡;張國有;楊德全;陳二云;;隧道滲流的數(shù)值方法[J];內(nèi)蒙古民族大學(xué)學(xué)報(自然科學(xué)版);2006年01期
6 張有天,周建平;水電站大型地下工程建設(shè)的新進展[J];水力發(fā)電;2004年12期
7 靳曉光;李曉紅;張燕瓊;;越江隧道施工過程的滲流-應(yīng)力耦合分析[J];水文地質(zhì)工程地質(zhì);2010年01期
8 賈媛媛;路軍富;魏龍海;崔光耀;;隧道降水施工對既有市政管線隧道影響研究[J];水文地質(zhì)工程地質(zhì);2010年06期
9 薛世峰,仝興華,岳伯謙,董波,宋惠珍;地下流固耦合理論的研究進展及應(yīng)用[J];石油大學(xué)學(xué)報(自然科學(xué)版);2000年02期
10 黃濤,楊立中;滲流與應(yīng)力耦合環(huán)境下裂隙圍巖隧道涌水量的預(yù)測研究[J];鐵道學(xué)報;1999年06期
相關(guān)博士學(xué)位論文 前1條
1 莫陽春;高水壓充填型巖溶隧道穩(wěn)定性研究[D];西南交通大學(xué);2009年
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