本文選題：開(kāi)洞地基 + 層狀巖體　； 參考：《重慶大學(xué)》2014年碩士論文

【摘要】：在社會(huì)不斷發(fā)展和國(guó)家城市化發(fā)展戰(zhàn)略的推進(jìn)下，城市化進(jìn)程迅速加快，地面與地下空間綜合利用成為發(fā)展重點(diǎn)。在重慶，地表高樓林立，地下防空洞、地鐵隧道、大型地下商場(chǎng)眾多。隨著時(shí)代發(fā)展，勢(shì)必面臨地面建筑的改建，拆遷，再建等工程，這些工程由于地下洞室的存在，既要考慮到上部建筑的穩(wěn)定性，又要考慮洞室的穩(wěn)定性，如果洞室出現(xiàn)穩(wěn)定性問(wèn)題，則影響建筑基礎(chǔ)，而基礎(chǔ)直接影響上部建筑，此即為洞室地基穩(wěn)定性問(wèn)題，是地面地下空間綜合開(kāi)發(fā)利用需要考慮的重點(diǎn)問(wèn)題。而占世界陸地面積達(dá)2/3的層狀巖體由于其明顯的各向異性特點(diǎn)以及復(fù)雜的破壞機(jī)制更為這些工程的安全進(jìn)行增加了復(fù)雜性。 因此本文利用能夠比較好的反映層狀巖體力學(xué)特性及破壞模式且易應(yīng)用于工程實(shí)際的Ubiquitous-Joint本構(gòu)模型分析了在不同荷載位置以及不同層理參數(shù)下層狀巖體開(kāi)洞地基穩(wěn)定性。論文的主要內(nèi)容和結(jié)論有： ①?gòu)睦碚摵蛯?shí)踐的角度出發(fā)，總結(jié)分析了層狀圍巖洞室的失穩(wěn)機(jī)理及破壞模型，表明層狀圍巖洞室的破壞模式及形態(tài)與其層理傾角等層理特性密切相關(guān)。同時(shí)，洞室地基的穩(wěn)定性涉及建筑地基和洞室圍巖兩者的穩(wěn)定性，，論文分別總結(jié)了兩者的穩(wěn)定性判據(jù)，整體作為洞室地基的穩(wěn)定性判據(jù)。 ②論文總結(jié)并比較了層狀巖體常用的計(jì)算模型，因?yàn)閁biquitous-Joint能夠比較好的模擬層狀巖體洞室圍巖的各向異性特點(diǎn)及破壞模式，以及便于應(yīng)用的特點(diǎn)，本文選取Ubiquitous-Joint本構(gòu)模型分析洞室地基的穩(wěn)定性。 ③運(yùn)用有限差分法，開(kāi)展層狀巖體開(kāi)洞地基動(dòng)態(tài)數(shù)值模擬分析，將洞室開(kāi)挖后的結(jié)果與傳統(tǒng)的Mohr-Coulomb本構(gòu)計(jì)算結(jié)果進(jìn)行比較，表明Ubiquitous-Joint本構(gòu)能比較好的反應(yīng)層狀巖體各向異性的特點(diǎn)。同時(shí)，施加上部荷載及改變其位置進(jìn)行動(dòng)態(tài)分析，結(jié)果表面荷載位置對(duì)洞室受力變形有一定影響，荷載位置不同應(yīng)力變形傳遞路徑有所不同，破壞形式有所改變。 ④以層理摩擦角、層理粘聚力、層理傾角和層理抗拉強(qiáng)度作為4因素，以洞頂、地表及邊墻相對(duì)變形作為評(píng)價(jià)指標(biāo)，開(kāi)展4因素4水平的正交試驗(yàn)，并對(duì)試驗(yàn)數(shù)據(jù)進(jìn)行極差分析和方差分析，在此基礎(chǔ)上進(jìn)行單因素敏感性分析，總結(jié)層理特性對(duì)洞室地基穩(wěn)定性的影響，計(jì)算結(jié)果表明，層理參數(shù)對(duì)洞室地基的穩(wěn)定性影響較大，各有不同。 ⑤將Ubiquitous-Joint本構(gòu)模型運(yùn)用于東大門(mén)隧道上方修建培訓(xùn)綜合樓工程，通過(guò)基坑開(kāi)挖和建筑荷載分步施加的動(dòng)態(tài)施工模擬，分析了在東大門(mén)隧道上方修建培訓(xùn)綜合樓時(shí)洞室地基的受力變形特點(diǎn)及其穩(wěn)定性，并與監(jiān)測(cè)資料進(jìn)行比較，計(jì)算結(jié)果與監(jiān)測(cè)數(shù)據(jù)一致，洞室地基安全穩(wěn)定。
[Abstract]:With the development of society and the development strategy of urbanization, the process of urbanization is speeding up rapidly, and the comprehensive utilization of surface and underground space becomes the key point of development. In Chongqing, the surface tall buildings, underground bomb shelters, subway tunnels, large underground shopping malls. With the development of the times, we are bound to face the reconstruction, demolition, reconstruction and other projects of ground buildings. Due to the existence of underground caverns, these projects should not only take into account the stability of the upper buildings but also the stability of the caverns. If the stability of the cavern appears, it will affect the foundation of the building, and the foundation directly affects the upper building, which is the stability problem of the foundation of the cave, which is the key problem that needs to be considered in the comprehensive development and utilization of the surface and underground space. Because of its obvious anisotropy and complex failure mechanism, the layered rock mass, which accounts for 2 / 3 of the world's land area, increases the complexity of the safety of these projects. In this paper, Ubiquitous-Joint constitutive model which can reflect the mechanical characteristics and failure mode of layered rock mass and is easy to be applied to engineering practice is used to analyze the stability of layered rock mass foundation with different load positions and different bedding parameters. The main contents and conclusions of the paper are as follows: 1. From the angle of theory and practice, the failure mechanism and failure model of layered surrounding rock cavern are summarized and analyzed. It is shown that the failure mode and morphology of layered surrounding rock cavern are closely related to the bedding characteristics such as bedding dip angle. At the same time, the stability of the cavern foundation is related to the stability of both the building foundation and the surrounding rock. (2) the paper summarizes and compares the commonly used calculation models of layered rock mass, because Ubiquitous-Joint can simulate the anisotropic characteristics and failure mode of the surrounding rock mass of layered rock mass, and it is easy to be applied. In this paper, Ubiquitous-Joint constitutive model is chosen to analyze the stability of cavern foundation. 3 using finite difference method, the dynamic numerical simulation analysis of layered rock opening foundation is carried out, and the results after excavation are compared with the traditional Mohr-Coulomb constitutive calculation results. It shows that Ubiquitous-Joint constitutive law can well reflect the anisotropy of layered rock mass. At the same time, the dynamic analysis is carried out by applying the upper load and changing its position. The results show that the surface load position has a certain influence on the stress and deformation of the cavern, the different stress and deformation transfer paths are different in the load position, and the failure form is changed. (4) taking bedding friction angle, bedding cohesion, bedding dip angle and bedding tensile strength as four factors, taking the relative deformation of roof, surface and side wall as evaluation index, the orthogonal experiments of 4 factors and 4 levels are carried out. On the basis of the range analysis and variance analysis of test data, single factor sensitivity analysis is carried out, and the influence of bedding characteristics on the stability of cavern foundation is summarized. The calculation results show that the bedding parameters have great influence on the stability of cavern foundation. Each is different. (5) the Ubiquitous-Joint constitutive model is applied to the construction of training complex building above the Dongmen tunnel, and the dynamic construction simulation is carried out through excavation of foundation pit and application of building load step by step. This paper analyzes the mechanical deformation characteristics and stability of the cavern foundation when the training complex building is built above the Dongmen tunnel, and compares with the monitoring data. The calculated results are consistent with the monitoring data, and the cavern foundation is safe and stable.
【學(xué)位授予單位】：重慶大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類(lèi)號(hào)】：TU470

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