發(fā)布時(shí)間：2018-06-03 20:09

  本文選題：盾構(gòu)法 + 濕陷性黃土��； 參考：《河北工程大學(xué)》2014年碩士論文

【摘要】：21世紀(jì)以來(lái)，全球經(jīng)濟(jì)高速發(fā)展，帶動(dòng)城市化發(fā)展歷程。世界人口的激增，導(dǎo)致資源空前緊張，城市地面交通面臨巨大壓力，隨著科學(xué)技術(shù)進(jìn)步，人類已逐漸掌握如何充分利用地下空間。地鐵的出現(xiàn)，緩解了地面交通的壓力，其安全、快速、舒適性，亦得到普通大眾的接受。如今一個(gè)城市是否發(fā)達(dá)，往往可以從其是否建成通車地鐵進(jìn)行衡量。 基于地鐵的出現(xiàn)，給予人類便利快捷的生活，如何保證其安全性，，應(yīng)是工程技術(shù)人員首要考慮的問(wèn)題。目前國(guó)內(nèi)研究地鐵隧道施工在軟土和粘土等中運(yùn)用，已積累較多素材，但對(duì)西北部黃土地質(zhì)研究相對(duì)較少，故本文著重闡述和研究盾構(gòu)法在黃土地區(qū)中發(fā)展應(yīng)用。 以西部某城市地鐵盾構(gòu)施工項(xiàng)目為平臺(tái)，運(yùn)用盾構(gòu)施工基本理論，結(jié)合黃土濕陷性等特性，通過(guò)數(shù)值建模與現(xiàn)場(chǎng)實(shí)測(cè)等方法，研究濕陷性黃土地區(qū)盾構(gòu)施工引起地層變形與沉降的相關(guān)規(guī)律；分析黃土性質(zhì)對(duì)地層及開(kāi)挖面附近的建筑物沉降變形的影響；運(yùn)用Peck公式預(yù)估地層變形，分析研究地層沉降現(xiàn)有監(jiān)測(cè)數(shù)據(jù)，通過(guò)線性回歸和最小二乘法求出Peck公式地層土體損失率及沉降槽寬度變化范圍，并對(duì)其進(jìn)行適當(dāng)?shù)男拚�，使能較好的預(yù)測(cè)黃土地區(qū)隧道盾構(gòu)施工引起地層變形與沉降規(guī)律。 通過(guò)建立FLAC3D數(shù)值模型模擬預(yù)測(cè)隧道盾構(gòu)施引起地層建筑物變形的相關(guān)規(guī)律，通過(guò)對(duì)計(jì)算結(jié)果的對(duì)比分析，得出采用何種加固措施能更好的控制地層沉降和變形；通過(guò)對(duì)黃土性質(zhì)的數(shù)值模擬分析，得出黃土內(nèi)摩擦角、黏聚力對(duì)地層沉降和變形的影響。設(shè)計(jì)地層沉降及建筑物基礎(chǔ)變形監(jiān)測(cè)方案，完成現(xiàn)場(chǎng)檢測(cè)，將現(xiàn)場(chǎng)檢測(cè)結(jié)果與計(jì)算結(jié)果相比較，觀察隧道施工影響范圍內(nèi)地層沉降實(shí)測(cè)值與數(shù)值模擬計(jì)算值的變化趨勢(shì)，檢測(cè)FLAC3D模擬計(jì)算結(jié)果的準(zhǔn)確度，得出FLAC3D數(shù)值計(jì)算用于預(yù)測(cè)地層沉降的可行性。
[Abstract]:Since the 21 st century, the global economy has developed at a high speed, driving the development of urbanization. With the development of science and technology, human beings have gradually grasped how to make full use of underground space. The emergence of subway alleviates the pressure of ground transportation, and its safety, speed and comfort are accepted by the general public. Nowadays, whether a city is developed or not is often measured by whether it is built and opened to subway. Based on the appearance of subway, how to guarantee the safety of subway is the most important problem for engineers and technicians to consider. At present, the domestic research on the application of subway tunnel construction in soft soil and clay has accumulated a lot of materials, but the research on loess geology in northwest China is relatively few. Therefore, this paper mainly expounds and studies the development and application of shield method in loess area. Taking the shield construction project of a city in the west of China as the platform, applying the basic theory of shield construction and combining the characteristics of loess collapsibility, the method of numerical modeling and field measurement is adopted. This paper studies the correlation law of stratum deformation and settlement caused by shield tunneling in collapsible loess area, analyzes the influence of loess property on subsidence deformation of stratum and building near excavating surface, uses Peck formula to estimate stratum deformation, The existing monitoring data of stratum settlement are analyzed and studied. The range of soil loss rate and width of settlement trough of Peck formula is obtained by linear regression and least square method, and the appropriate correction is made. It is possible to predict the deformation and settlement law of stratum caused by shield tunneling in loess area. Through the establishment of FLAC3D numerical model to predict the correlation law of tunnel shield tunneling caused by stratum building deformation, through the comparison and analysis of the calculation results, it is concluded that what reinforcement measures can be used to better control the formation settlement and deformation; Through numerical simulation and analysis of loess properties, the influence of internal friction angle and cohesion on stratum settlement and deformation is obtained. The monitoring scheme of ground settlement and deformation of building foundation is designed, and the field detection is completed. The result of field detection is compared with the calculated result, and the variation trend of ground settlement measured value and numerical simulation calculation value in the influence area of tunnel construction is observed. The accuracy of FLAC3D simulation results is tested, and the feasibility of FLAC3D numerical calculation for predicting ground subsidence is obtained.
【學(xué)位授予單位】：河北工程大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：U455.43

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