發(fā)布時(shí)間：2018-06-10 21:29

  本文選題：盾構(gòu)隧道 + 端頭加固�。� 參考：《天津城建大學(xué)》2014年碩士論文

【摘要】：在我國(guó)地鐵事業(yè)迅猛發(fā)展的今天，盾構(gòu)技術(shù)被越來(lái)越廣泛的采用。選擇合理的始發(fā)端頭土體加固范圍以及準(zhǔn)確掌握盾構(gòu)施工對(duì)周圍環(huán)境的影響規(guī)律對(duì)于軟土盾構(gòu)施工是極其重要的。本文以天津地鐵2號(hào)線機(jī)場(chǎng)延長(zhǎng)線盾構(gòu)隧道施工段為背景，結(jié)合現(xiàn)場(chǎng)實(shí)測(cè)資料，運(yùn)用ABAQUS有限元程序計(jì)算了天津地區(qū)盾構(gòu)始發(fā)端頭合理縱向加固范圍、盾構(gòu)施工造成地層沉降的規(guī)律以及盾構(gòu)近接樁基施工對(duì)其的影響，主要得到以下結(jié)論： （1）通過(guò)理論計(jì)算與模擬結(jié)果的對(duì)比，發(fā)現(xiàn)理論計(jì)算得出的加固長(zhǎng)度范圍偏小�；诓煌庸涕L(zhǎng)度下破除封門和開(kāi)挖時(shí)土體位移和應(yīng)力比較，結(jié)合本區(qū)實(shí)際工程情況，認(rèn)為天津軟土地區(qū)盾構(gòu)始發(fā)端頭的合理縱向加固范圍大致為8.2m~11.5m。若設(shè)計(jì)時(shí)考慮較大的安全余量，可采用在端頭加固后段的三軸攪拌樁中適當(dāng)減小水泥摻量的方法達(dá)到既安全又有利于盾構(gòu)掘進(jìn)控制和降低造價(jià)的目的。 （2）地表任一斷面在盾構(gòu)施工過(guò)程中都要經(jīng)歷一個(gè)隨距開(kāi)挖面相對(duì)位置不同而不斷變化的沉降過(guò)程；同一斷面不同深度處土層的沉降量及沉降影響范圍不同，深層土體受施工擾動(dòng)響應(yīng)較地表更為敏感；通常情況下淺表層與深層土體沉降趨勢(shì)一致，，但由于城市地表硬殼層的存在，會(huì)導(dǎo)致監(jiān)測(cè)數(shù)據(jù)較實(shí)際沉降值偏小，實(shí)際工程中應(yīng)重視這種現(xiàn)象。 （3）由于遮擋效應(yīng)的存在，近隧道建筑物樁基礎(chǔ)中靠近隧道的單樁水平位移要大于遠(yuǎn)離隧道的單樁。樁與隧道之間的距離將影響盾構(gòu)施工對(duì)鄰近樁體的擾動(dòng)程度。距離隧道越近，盾構(gòu)施工引起的樁身水平和豎向位移就越大。樁端與隧道軸線的相對(duì)位置也會(huì)影響到樁體水平位移的變化規(guī)律。當(dāng)樁端位于隧道軸線以下時(shí)，樁身水平位移要小于樁端在隧道軸向上方和與軸線齊平時(shí)的位移。
[Abstract]:With the rapid development of the subway industry in China, the shield technology is becoming more and more widely used. It is very important for the shield construction to select the reasonable range of soil reinforcement and to accurately grasp the influence of the shield construction on the surrounding environment. This paper takes the construction section of the shield tunnel of the airport extension line of Tianjin Metro Line 2 as the construction section. Background, combined with the field measured data, the ABAQUS finite element program is used to calculate the reasonable longitudinal reinforcement range of the beginning end of the shield in Tianjin area, the law of the stratum settlement caused by the shield construction and the influence of the shield construction on the pile foundation construction. The following conclusions are mainly obtained.
(1) through the comparison of theoretical calculation and simulation results, it is found that the reinforcement length range of the theoretical calculation is small. Based on the comparison of the soil displacement and stress when the door is broken and excavated under the different reinforcement lengths, the reasonable longitudinal reinforcement range of the shield starting end of the Tianjin soft soil area is approximately 8.2m~11.5m.. If the large safety allowance is considered in the design, the method of reducing the cement content in the three shaft mixing pile after the end reinforcement can be used to achieve the purpose of safety, shield driving control and cost reduction.
(2) in the course of the shield construction, any section of the surface of the earth must undergo a process of settlement that varies with the relative position of the distance between the surface of the excavation; the settlement and the influence range of the soil layer are different at different depths of the same section, and the deep soil soil is more sensitive to the ground surface and the deep soil under the normal condition. The settlement trend is the same. However, due to the existence of hard crust in the urban area, the monitoring data will be smaller than the actual settlement value. This phenomenon should be emphasized in practical engineering.
(3) because of the occlusion effect, the horizontal displacement of the single pile near the tunnel in the pile foundation of the near tunnel building is greater than that of the single pile far away from the tunnel. The distance between the pile and the tunnel will affect the disturbance degree of the shield construction to the adjacent pile. The closer the tunnel is to the tunnel, the greater the horizontal and vertical displacement of the pile is caused by the shield construction. The pile end and the tunnel shaft will be more and more. The relative position of the line also affects the change law of the horizontal displacement of the pile body. When the pile end is below the axis of the tunnel, the horizontal displacement of the pile body is less than that of the pile end in the axial and the axis of the tunnel.
【學(xué)位授予單位】：天津城建大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：U455.43

【參考文獻(xiàn)】

相關(guān)期刊論文 前10條

1 邊金,陶連金,郭軍;盾構(gòu)隧道開(kāi)挖引起的地表沉降規(guī)律[J];地下空間與工程學(xué)報(bào);2005年02期

2 張?jiān)栖?宰金珉;王旭東;常銀生;戚科駿;;隧道開(kāi)挖對(duì)臨近樁基影響的二維數(shù)值分析[J];地下空間與工程學(xué)報(bào);2005年06期

3 姚燕明;曹偉飚;沈張勇;;盾構(gòu)穿越高架對(duì)其樁基變形和內(nèi)力影響分析[J];地下空間與工程學(xué)報(bào);2005年06期

4 李大勇,王暉,武亞軍;盾構(gòu)掘進(jìn)對(duì)周圍環(huán)境的影響分析[J];地下空間與工程學(xué)報(bào);2005年S1期

5 楊永平;周順華;莊麗;;軟土地區(qū)地鐵盾構(gòu)區(qū)間隧道近接樁基數(shù)值分析[J];地下空間與工程學(xué)報(bào);2006年04期

6 辛振省;王金安;馬海濤;彭加強(qiáng);;盾構(gòu)始發(fā)端預(yù)加固合理范圍研究[J];地下空間與工程學(xué)報(bào);2007年03期

7 吳韜;韋良文;張慶賀;;大型盾構(gòu)出洞區(qū)加固土體穩(wěn)定性研究[J];地下空間與工程學(xué)報(bào);2008年03期

8 付文生;夏斌;羅冬梅;;盾構(gòu)隧道超近距離穿越對(duì)樁基影響的對(duì)比研究[J];地下空間與工程學(xué)報(bào);2009年01期

9 于寧;白廷輝;朱合華;;盾構(gòu)隧道預(yù)應(yīng)力管片接頭的模型試驗(yàn)研究[J];地下空間與工程學(xué)報(bào);2009年03期

10 公孫銘;張智梅;楊超;滕麗;;盾構(gòu)下穿機(jī)場(chǎng)跑道的數(shù)值模擬研究[J];地下空間與工程學(xué)報(bào);2011年03期

相關(guān)博士學(xué)位論文 前1條

1 黃強(qiáng)兵;地裂縫對(duì)地鐵隧道的影響機(jī)制及病害控制研究[D];長(zhǎng)安大學(xué);2009年

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