發(fā)布時(shí)間：2018-01-14 01:08

  本文關(guān)鍵詞：地下洞室施工力學(xué)特性及合理斷面研究　出處：《重慶交通大學(xué)》2014年碩士論文　論文類型：學(xué)位論文

  更多相關(guān)文章： 洞室開挖 圍巖應(yīng)力分析 合理斷面形式 合理高跨比 數(shù)值模擬

【摘要】：在地下洞室施工時(shí)，，不同的施工方法和不同的施工順序都會(huì)導(dǎo)致圍巖產(chǎn)生不同的位移和應(yīng)力結(jié)果。而洞室斷面的形式?jīng)Q定了洞室施工的難易程度和施工過(guò)程中圍巖及支護(hù)結(jié)構(gòu)的穩(wěn)定程度；洞室斷面跨度越大，洞室施工難度越大、圍巖支護(hù)結(jié)構(gòu)的穩(wěn)定性越復(fù)雜。大跨度斷面洞室的支護(hù)襯砌參數(shù)、斷面型式及施工方案是洞室建設(shè)研究的重點(diǎn)和難點(diǎn)。以昆明軌道交通3號(hào)線太平村站~虹橋村站區(qū)間隧道工程洞室斷面形式為依托，結(jié)合巖石力學(xué)、彈塑性力學(xué)方面的理論知識(shí)，用彈塑性力學(xué)理論、D-P屈服準(zhǔn)則，考慮巖土的非線性因素等，建立有限元ansys模型，分別對(duì)不同圍巖級(jí)別時(shí)，不同高跨比形式的斷面形式，進(jìn)行模擬分析，得出以下結(jié)論； ①對(duì)（單心圓、三心圓及五心圓）襯砌輪廓斷面進(jìn)行分析比選，得出合理的襯砌輪廓斷面形式； ②對(duì)模擬襯砌結(jié)構(gòu)的豎向位移收斂、初期襯砌受力、圍巖應(yīng)力分布及初期襯砌的偏心距等因素進(jìn)行了詳細(xì)的分析與比較，得出不同圍巖級(jí)別時(shí)，洞室斷面的合理高跨比； ③對(duì)兩車道隧道標(biāo)準(zhǔn)斷面形式進(jìn)行計(jì)算分析，求解出襯砌結(jié)構(gòu)的抗力區(qū)范圍； ④對(duì)上下臺(tái)階法施工過(guò)程進(jìn)行了數(shù)值模擬，通過(guò)對(duì)上、下臺(tái)階開挖后洞室結(jié)構(gòu)的豎向位移、水平位移收斂值、初期襯砌受力、圍巖應(yīng)力分布等因素進(jìn)行了對(duì)比分析，得出臺(tái)階法施工時(shí)，洞室結(jié)構(gòu)施工過(guò)程中的豎向位移、水平位移收斂值、初期襯砌的受力、圍巖應(yīng)力分布的變化情況，并結(jié)合現(xiàn)場(chǎng)監(jiān)測(cè)數(shù)據(jù)進(jìn)行了比較和分析，實(shí)際開挖過(guò)程和模擬開挖相比較，隧道圍巖的變形在開挖后的相同部位變化趨勢(shì)基本一致，證明有限元方法可以有效模擬隧道施工。
[Abstract]:During the construction of the underground cavern. Different construction methods and different construction sequence will lead to different displacement and stress results of surrounding rock, and the form of tunnel section determines the difficulty of construction and the stability of surrounding rock and supporting structure during construction. Degree; The larger the section span, the more difficult the construction, the more complex the stability of surrounding rock supporting structure. The support lining parameters of large-span cross-section cavern. Section type and construction scheme are the key and difficult points in the study of tunnel construction. Based on the cross-section form of tunnel between Taiping Village Station ~ Hongqiao Village Station of Kunming Rail Transit Line 3, combined with rock mechanics. Based on the theory of elastoplastic mechanics and the D-P yield criterion, the finite element ansys model is established for different surrounding rock classes, taking into account the nonlinear factors of rock and soil. The section forms of different height / span ratio are simulated and analyzed, and the following conclusions are drawn. The main contents are as follows: (1) analyze and select the contour section of lining (single center circle, three center circle and five center circle), and get the reasonable profile section form of lining; 2. The factors of vertical displacement convergence, initial lining force, stress distribution of surrounding rock and eccentricity of initial lining are analyzed and compared in detail, and different surrounding rock levels are obtained. Reasonable height / span ratio of tunnel section; (3) the standard section of two-lane tunnel is calculated and analyzed, and the range of resistance zone of lining structure is solved. The vertical displacement, horizontal displacement convergence value and initial lining force of the cavern structure after the excavation of the upper and lower steps are simulated by numerical simulation of the construction process of the upper and lower step method. The stress distribution of surrounding rock and other factors are compared and analyzed, and the vertical displacement, horizontal displacement convergence value, initial lining force and stress distribution of surrounding rock are obtained during the construction of cavern structure by step method. Combined with the field monitoring data to compare and analyze the actual excavation process and simulation of excavation the tunnel surrounding rock deformation in the same position after excavation the trend of change is basically the same. It is proved that the finite element method can simulate the tunnel construction effectively.
【學(xué)位授予單位】：重慶交通大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：U455;U456.3

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