本文選題：隧道工程　切入點：地鐵隧道　出處：《交通運輸工程學(xué)報》2017年02期 　論文類型：期刊論文

【摘要】：以地鐵隧道穿越西安三類勘察場地的地裂縫為研究原型,分析了地裂縫的發(fā)育特征;運用數(shù)值模擬方法,研究了三類場地地裂縫不同活動量值引起的地層應(yīng)力場、破壞區(qū)域和位移場的變化特征,計算了地裂縫的影響區(qū)域范圍,解析了地裂縫帶活動對地鐵隧道結(jié)構(gòu)產(chǎn)生的破壞特征,并提出了相應(yīng)的工程對策。研究結(jié)果表明:地裂縫活動造成其兩側(cè)地層的豎向應(yīng)力呈近似反對稱的分布形態(tài),地層應(yīng)力的變化增量隨上盤沉降的增加而增大;通過綜合分析位于地鐵隧道拱頂和拱底埋深處地層的豎向應(yīng)力變化特征,得到三類場地地裂縫上盤和下盤的主要影響范圍分別為0~20m和0~15m,經(jīng)對比驗證,與物理模型試驗結(jié)果一致;下盤靠近地裂縫的區(qū)域發(fā)生剪切破壞,且破裂逐漸向上擴(kuò)展,最終形成一條與地裂縫呈18°夾角的剪切破壞包線,其中間包含的范圍為剪切破壞的集中區(qū)域;地裂縫活動導(dǎo)致兩側(cè)土體發(fā)生位移突變,形成2個類似"活動楔體"的變形區(qū)域,且該區(qū)域范圍逐漸擴(kuò)大;上、下盤隧道的差異沉降隨著地裂縫錯動量的增加而增大,當(dāng)?shù)亓芽p活動量達(dá)到20cm時,造成整體式地鐵隧道呈"S"破壞形態(tài);為適應(yīng)三類場地地裂縫活動引起的大變形,建議地鐵隧道結(jié)構(gòu)采用分段設(shè)置特殊變形縫加柔性接頭處理等措施進(jìn)行設(shè)防。
[Abstract]:Taking the ground fissures of the subway tunnel through three kinds of exploration sites in Xi'an as the research prototype, the characteristics of the ground fissures are analyzed, and the formation stress field caused by the different activity values of the ground fissures in the three kinds of sites are studied by using the numerical simulation method. The variation characteristics of failure region and displacement field are calculated, and the damage characteristics of subway tunnel structure caused by ground fissure zone activity are analyzed. The corresponding engineering countermeasures are put forward. The results show that the vertical stress of the strata on both sides of the ground is approximately antisymmetric due to the activity of the ground fracture, and the increment of the formation stress increases with the increase of the upper plate settlement. Based on the comprehensive analysis of the vertical stress variation characteristics of the subways at the arch top and the bottom of the tunnel, the main influence ranges of the upper and lower face of the ground fissures are 0 ~ 20 m and 0 ~ 15 m respectively, which are consistent with the results of the physical model test. Shear failure occurs in the area near the ground fissure, and the fracture gradually extends upward, finally forming a shear failure envelope line with an angle of 18 擄to the ground fissure, the range of which is the concentrated area of shear failure. The ground fissures cause displacement abrupt changes on both sides of the soil mass, forming two deformation areas similar to "active wedge", and the range of this area is gradually expanding, and the differential settlement of the downboard tunnel increases with the increase of fault momentum of the ground fissure. When the local crack activity reaches 20cm, it causes the integral subway tunnel to take the form of "S" failure, and to adapt to the large deformation caused by the ground fissure activity of three kinds of sites, It is suggested that the subway tunnel structure should be fortified with special deformed joints and flexible joints.
【作者單位】： 長安大學(xué)地質(zhì)工程與測繪學(xué)院;長安大學(xué)西部礦產(chǎn)資源與地質(zhì)工程教育部重點實驗室;亞利桑那大學(xué)工程學(xué)院;
【基金】：國家973計劃項目(2014CB744700) 中國地質(zhì)調(diào)查局地質(zhì)調(diào)查項目(DD20160235) 國家自然科學(xué)基金項目(41372327,41372328) 中央高校基本科研業(yè)務(wù)費專項資金項目(310826174001)
【分類號】：U231.1;U452.11

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