【摘要】：本文以青島地鐵M3號(hào)線(xiàn)青島火車(chē)站至大學(xué)路區(qū)間隧道下穿山東出入境檢疫局高層建筑為工程背景，根據(jù)勘察報(bào)告及建筑物資料收集成果，將建筑物、隧道和巖土體看成一個(gè)整體，利用ABAQUS有限元數(shù)值分析，，結(jié)合強(qiáng)度折減法和現(xiàn)場(chǎng)實(shí)測(cè)數(shù)據(jù)，以強(qiáng)度和變形為雙重控制指標(biāo)，對(duì)隧道施工過(guò)程中隧道自身及建筑物安全穩(wěn)定性進(jìn)行了相關(guān)探討，對(duì)地表沉降、洞室收斂、圍巖穩(wěn)定性評(píng)估方法、建筑結(jié)構(gòu)位移控制標(biāo)準(zhǔn)等核心問(wèn)題進(jìn)行了深入分析。本文主要的研究工作如下： (1)探討屈服準(zhǔn)則對(duì)強(qiáng)度折減安全系數(shù)的影響，與僅考慮剪切屈服的Mohr-Coulomb準(zhǔn)則相比，修正后考慮張拉屈服的Mohr-Coulomb準(zhǔn)則對(duì)剪切屈服和張拉屈服的巖土材料都具有普遍的適用性。 (2)利用ABAQUS程序建立有限元模型，基于圍巖壓力、基底壓力和支護(hù)阻力共同作用分析的數(shù)值模擬方法，分析隧道開(kāi)挖對(duì)地表沉降和洞室變形的影響規(guī)律，并引入安全系數(shù)概念對(duì)隧道圍巖及初襯穩(wěn)定性進(jìn)行評(píng)判。利用有限元強(qiáng)度折減法，給出了不同下穿方案和基于不同襯砌性質(zhì)的圍巖安全系數(shù)，并對(duì)其穩(wěn)定性規(guī)律進(jìn)行了分析；運(yùn)用有限元數(shù)值模擬計(jì)算襯砌的內(nèi)力，再根據(jù)《公路隧道設(shè)計(jì)規(guī)范》計(jì)算襯砌安全系數(shù)，依此來(lái)評(píng)價(jià)土巖條件下隧道支護(hù)參數(shù)設(shè)計(jì)的合理性。 (3)將建筑物自重下的變形值和隧道開(kāi)挖完成后建筑物發(fā)生的變形值之和不大于建筑規(guī)范允許值作為地鐵近鄰建筑物位移控制指標(biāo)，對(duì)高層建筑上部結(jié)構(gòu)和下部基礎(chǔ)變形分析，計(jì)算結(jié)果均滿(mǎn)足位移控制標(biāo)準(zhǔn)；對(duì)建筑結(jié)構(gòu)內(nèi)力進(jìn)行分析，并對(duì)梁柱構(gòu)件進(jìn)行承載力驗(yàn)算，計(jì)算結(jié)果也滿(mǎn)足規(guī)范要求。 (4)對(duì)現(xiàn)場(chǎng)監(jiān)測(cè)數(shù)據(jù)整理分析，探討掌子面的穩(wěn)定性與地表沉降之間的聯(lián)系，分析支護(hù)結(jié)構(gòu)變形情況，分析開(kāi)挖步對(duì)建筑物和地表沉降的影響，判斷隧道自身及建筑物的穩(wěn)定性趨勢(shì)。
[Abstract]:In this paper, under the tunnel between Qingdao Railway Station and University Road of Qingdao Metro Line M3, the high-rise building of Shandong Entry-Exit Inspection Bureau is taken as the engineering background. According to the survey report and the data collected from the building, the building is built. The tunnel and the rock and soil are regarded as a whole. By using the ABAQUS finite element numerical analysis, combined with the strength reduction method and the field measured data, the strength and deformation are taken as the double control indexes. This paper discusses the safety and stability of the tunnel itself and the building during the tunnel construction, and analyzes the core problems such as the ground subsidence, the convergence of the cavern, the evaluation method of the surrounding rock stability, the control standard of the displacement of the building structure and so on. The main work of this paper is as follows: (1) the influence of yield criterion on the safety factor of strength reduction is discussed, compared with the Mohr-Coulomb criterion which only considers shear yield. The modified Mohr-Coulomb criterion, which considers tensile yield, is generally applicable to both shear and tensile yielding geotechnical materials. (2) the finite element model is established by ABAQUS program. Based on the numerical simulation method of surrounding rock pressure, basement pressure and support resistance, the influence of tunnel excavation on ground subsidence and cavity deformation is analyzed. The concept of safety factor is introduced to evaluate the stability of surrounding rock and initial lining of tunnel. By using the finite element strength reduction method, the safety factors of surrounding rock based on different underpass schemes and different lining properties are given, and its stability law is analyzed. The internal force of lining is calculated by using finite element numerical simulation, and then the safety factor of lining is calculated according to the Design Code of Highway Tunnel, and the rationality of tunnel support parameter design under the condition of soil and rock is evaluated. (3) the sum of the deformation value under the weight of the building and the deformation value of the building after the tunnel excavation is not greater than the allowable value of the building code is taken as the displacement control index of the building near the subway. For the deformation analysis of the superstructure and the lower foundation of the high-rise building, the calculated results meet the displacement control standard. The internal force of building structure is analyzed and the bearing capacity of Liang Zhu member is checked. (4) analyze the monitoring data, discuss the relation between the stability of the face and the surface settlement, analyze the deformation of the supporting structure, and analyze the influence of the excavation step on the building and the surface settlement. Judge the stability trend of tunnel itself and buildings.
【學(xué)位授予單位】：青島理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2013
【分類(lèi)號(hào)】：U451;TU973

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