發(fā)布時間：2018-04-29 15:27

  本文選題：土石混填地基 + 隧道結(jié)構(gòu)��； 參考：《重慶大學(xué)》2014年碩士論文

【摘要】：土石混合體是自然界常見的一種巖土體，它對隧道的不良影響主要表現(xiàn)為因地基承載力不足而發(fā)生隧道整體或局部下沉、向洞內(nèi)擠壓和底板隆起，以及由此引發(fā)的各種結(jié)構(gòu)損傷。當(dāng)隧道坐落在這種地基上時，如處理不當(dāng)，，易給工程建設(shè)帶來難題及造成危害。 論文以實(shí)際隧道工程為依托，采用現(xiàn)場調(diào)查、理論研究及數(shù)值模擬相結(jié)合的方法，對土石混填地基隧道結(jié)構(gòu)穩(wěn)定性及補(bǔ)強(qiáng)措施進(jìn)行研究，開展的主要工作如下： ①收集該案例隧道的勘察、設(shè)計(jì)、施工等相關(guān)資料，對案例工程隧道結(jié)構(gòu)的開裂情況進(jìn)行實(shí)地調(diào)查和分析。 ②通過數(shù)值模擬試驗(yàn)獲得土石混填地基的力學(xué)參數(shù)。運(yùn)用MATLAB隨機(jī)程序結(jié)合CAD繪圖軟件生成土石混合體隨機(jī)模型，導(dǎo)入FLAC3D進(jìn)行數(shù)值模擬試驗(yàn)。根據(jù)數(shù)值模擬試驗(yàn)結(jié)果對數(shù)據(jù)進(jìn)行處理，得出土石混合體的彈性模量、粘聚力、內(nèi)摩擦角和泊松比。 ③采用GTS有限元分析軟件模擬土石混填地基隧道結(jié)構(gòu)的穩(wěn)定性。運(yùn)用地層結(jié)構(gòu)法和荷載結(jié)構(gòu)法模擬隧道現(xiàn)狀回填情況和回填完成情況下隧道結(jié)構(gòu)的穩(wěn)定性，根據(jù)模擬結(jié)果分析隧道產(chǎn)生裂縫的原因，并與實(shí)際情況相對比。 ④結(jié)合隧道實(shí)際情況及前人經(jīng)驗(yàn)進(jìn)行理論分析，確定隧道結(jié)構(gòu)的補(bǔ)強(qiáng)加固方案。對該補(bǔ)強(qiáng)加固方案進(jìn)行數(shù)值分析，與未補(bǔ)強(qiáng)情況下隧道回填完成時模擬結(jié)果進(jìn)行對比，并評價該補(bǔ)強(qiáng)加固效果。
[Abstract]:The soil-rock mixture is a common rock and soil mass in nature. Its adverse effect on the tunnel is mainly caused by the overall or local subsidence of the tunnel due to the insufficient bearing capacity of the foundation, the extrusion of the tunnel and the uplift of the bottom plate. And the resulting structural damage. When the tunnel is located on this foundation, if it is not handled properly, it will bring problems and harm to the engineering construction. Based on the actual tunnel engineering, the paper studies the stability and reinforcement measures of the tunnel structure with the combination of field investigation, theoretical research and numerical simulation. The main work is as follows: The main contents are as follows: 1. Collect the investigation, design, construction and other relevant data of the case tunnel, and carry out field investigation and analysis on the cracking situation of the tunnel structure of the case engineering. 2. The mechanical parameters of soil and rock fill foundation are obtained by numerical simulation test. The soil-rock mixed random model was generated by using MATLAB random program and CAD drawing software, and was imported into FLAC3D to carry out numerical simulation test. The elastic modulus, cohesive force, internal friction angle and Poisson's ratio of soil-rock mixture are obtained by processing the data according to the results of numerical simulation test. GTS finite element analysis software is used to simulate the stability of the tunnel structure. The stability of tunnel structure under the condition of backfilling and backfilling is simulated by the method of stratum structure and load structure. According to the simulation results, the causes of the cracks in the tunnel are analyzed and compared with the actual situation. 4According to the actual situation of the tunnel and the previous experience, the reinforcement scheme of the tunnel structure is determined. The numerical analysis of the reinforcement scheme is carried out, which is compared with the simulation results when the backfill of the tunnel is completed without reinforcement, and the effect of the reinforcement is evaluated.
【學(xué)位授予單位】：重慶大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：U451;U452.11

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