發(fā)布時(shí)間：2018-09-12 05:39

【摘要】：開(kāi)展西安黃土地區(qū)地鐵區(qū)間隧道盾構(gòu)施工誘發(fā)的地表變形及對(duì)地表建筑物的變形控制技術(shù)研究具有重要的理論意義和工程應(yīng)用價(jià)值。本文以西安地鐵三號(hào)線大雁塔～北池頭區(qū)間隧道盾構(gòu)施工工程為依托，采用理論分析、數(shù)值模擬和工程實(shí)踐相結(jié)合的手段開(kāi)展研究工作，主要工作和結(jié)論有： （1）結(jié)合土壓平衡盾構(gòu)施工引起的地表沉降機(jī)理得出了影響地表沉降量的主要因素有：土層性質(zhì)、施工方法、隧道埋深、上部荷載的形式及大小、隧道斷面形式及大小、支護(hù)結(jié)構(gòu)形式和施工管理等方面。地表變形引起建筑物基礎(chǔ)周?chē)馏w變形，進(jìn)而影響建筑物結(jié)構(gòu)變形，建筑物主要依靠基礎(chǔ)剛度抵抗土體變形，提出盾構(gòu)隧道施工對(duì)不同基礎(chǔ)樓房的影響。 （2）采用數(shù)值模擬軟件FLAC對(duì)在正常施工過(guò)程引起地表變形進(jìn)行模擬預(yù)測(cè)，預(yù)測(cè)結(jié)果表明，按正常的施工工序施工沒(méi)有輔助的加固措施時(shí)，盾構(gòu)穿過(guò)此區(qū)間時(shí)樓房沉降比較大，超過(guò)了允許的變形值。 （3）根據(jù)Peck理論計(jì)算方法對(duì)盾構(gòu)施工引起的地表樓房變形控制進(jìn)行確定，再結(jié)合大雁塔～北池頭區(qū)間隧道的實(shí)際情況，，給出了在該區(qū)間盾構(gòu)引起的地表沉降的允許變形值。 （4）結(jié)合該區(qū)間的地質(zhì)構(gòu)造對(duì)施工過(guò)程提出了相應(yīng)的變形控制技術(shù)：袖閥管注漿、降低盾構(gòu)的施工速度保證盾構(gòu)平穩(wěn)推進(jìn)、加強(qiáng)同步注漿量、環(huán)箍補(bǔ)漿量、保證兩臺(tái)盾構(gòu)機(jī)沿隧道走向方向的距離等盾構(gòu)施工技術(shù)。 （5）根據(jù)現(xiàn)場(chǎng)實(shí)際情況制定相應(yīng)的變形監(jiān)測(cè)方案，通過(guò)現(xiàn)場(chǎng)監(jiān)測(cè)數(shù)據(jù)和預(yù)測(cè)數(shù)據(jù)進(jìn)行對(duì)比，結(jié)果表明，通過(guò)改進(jìn)施工技術(shù)后保證在施工過(guò)程中該樓房的變形控制在允許范圍內(nèi)。
[Abstract]:It is of great theoretical significance and engineering value to study the ground deformation induced by shield tunneling in Xi'an Loess region and the deformation control technology of surface buildings. Based on the shield tunneling construction project of Dayan Pagoda to Beichitou section of Xi'an Metro Line 3, the research work is carried out by means of theoretical analysis, numerical simulation and engineering practice. The main works and conclusions are as follows: (1) combined with the mechanism of ground subsidence caused by earth pressure balance shield construction, the main factors influencing the surface settlement are: soil property, construction method, tunnel depth, form and size of upper load. Tunnel section form and size, support structure form and construction management and so on. Surface deformation causes soil deformation around the foundation of the building, which in turn affects the deformation of the structure of the building. The building mainly relies on the stiffness of the foundation to resist the deformation of the soil. The influence of shield tunnel construction on different foundation buildings is put forward. (2) numerical simulation software FLAC is used to simulate and predict the surface deformation caused by normal construction. When there is no auxiliary reinforcement measure in accordance with the normal construction procedure, the building settlement is larger when shield tunneling passes through this section. It exceeds the allowable deformation value. (3) according to the Peck theory calculation method, the deformation control of ground surface building caused by shield tunneling is determined, and the actual situation of Dayan Pagoda to Beichitou tunnel is combined. The allowable deformation value of the ground subsidence caused by shield tunneling in this section is given. (4) combined with the geological structure of the section, the corresponding deformation control technology, sleeve valve pipe grouting, is put forward for the construction process. Reduce the construction speed of shield to ensure the smooth progress of shield, strengthen the amount of synchronous grouting, ring hoop grouting, The construction technology of equal shield machine along the direction of tunnel direction is guaranteed. (5) according to the actual situation in the field, the corresponding deformation monitoring scheme is worked out, and the results show that, After improving the construction technology, the deformation of the building is controlled within the allowable range.
【學(xué)位授予單位】：西安科技大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類(lèi)號(hào)】：U455.43;TU433

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