【摘要】：在21世紀(jì)的今天,國(guó)內(nèi)外巖體工程發(fā)展十分迅速,越來(lái)越多的涉及到了能源、交通、礦山、水利和國(guó)防工程的建造。目前這些工程要面對(duì)大量的巖體的開挖和處理問題,涉及到大量的巖體工程性質(zhì)。而巖體本身的強(qiáng)度特性以及巖體峰后的力學(xué)性質(zhì)對(duì)這些工程的設(shè)計(jì)、施工和穩(wěn)定性評(píng)價(jià)、巖土加固等都有直接的影響。因此本文采用數(shù)值模擬方法對(duì)地下工程的斷面開挖進(jìn)行模擬,與實(shí)測(cè)數(shù)據(jù)進(jìn)行對(duì)比分析,研究峰后力學(xué)參數(shù)的演化規(guī)律。 本文的主要工作包括： (1)深部硬巖峰后力學(xué)特性理論研究 通過在數(shù)據(jù)庫(kù)中的搜索學(xué)習(xí),深入了解深部硬巖峰后力學(xué)特性的理論知識(shí),同時(shí)加入自己的理解,研究、學(xué)習(xí)他人的研究成果,鞏固自己后續(xù)研究工作的理論基礎(chǔ)。 (2)巖體力學(xué)參數(shù)敏感性研究 利用FLAC3D數(shù)值軟件,設(shè)計(jì)模擬計(jì)算方案,對(duì)彈性模量、泊松比、抗拉強(qiáng)度、初始粘聚力、殘余粘聚力、初始內(nèi)摩擦角、殘余內(nèi)摩擦角、粘聚力臨界應(yīng)變值、內(nèi)摩擦角臨界應(yīng)變值9個(gè)巖體參數(shù)進(jìn)行敏感性分析研究。 (3)粘聚力和內(nèi)摩擦角變化曲線敏感性研究 利用FLAC3D數(shù)值軟件,設(shè)計(jì)模擬計(jì)算方案,改變兩者從初始值到殘余值的線性變化方式,觀察塑性區(qū)體積和位移在不同非線性變化形式下的敏感性。 (4)尋求敏感性參數(shù) 在以上的研究基礎(chǔ)上,尋求敏感性參數(shù)表征粘聚力和內(nèi)摩擦角非線性變化曲線的凹凸程度,在劃定的取值范圍內(nèi),能夠保證敏感性參數(shù)與曲線一一對(duì)應(yīng)。 (5)實(shí)例反分析 基于BP神經(jīng)網(wǎng)絡(luò)和遺傳算法位移增量反分析方法,結(jié)合工程實(shí)例,研究深部硬巖峰后力學(xué)參數(shù)的演化規(guī)律。
[Abstract]:In the 21st century, rock mass engineering is developing rapidly at home and abroad, and more projects involving energy, transportation, mining, water conservancy and national defense have been built. At present, these projects have to face a large number of rock excavation and treatment problems, involving a large number of rock engineering properties. The strength characteristics of rock mass and the mechanical properties of rock mass after peak have a direct effect on the design, construction and stability evaluation of these projects, as well as the reinforcement of rock and soil. In this paper, the numerical simulation method is used to simulate the excavation of underground engineering section, and compared with the measured data, the evolution law of the mechanical parameters after the peak is studied. The main work of this paper is as follows: (1) theoretical study on the post-peak mechanical properties of deep hard rock through searching and learning in the database, we can deeply understand the theoretical knowledge of the post-peak mechanical properties of deep hard rock, and add our own understanding at the same time. Research, learn the research results of others, consolidate their own theoretical basis for further research work. (2) the sensitivity of mechanical parameters of rock mass is studied by using FLAC3D numerical software, and the simulation calculation scheme is designed for elastic modulus, Poisson's ratio, tensile strength, initial cohesive force, residual cohesive force, initial internal friction angle, residual internal friction angle, and residual internal friction angle. The critical strain value of cohesive force and the critical strain value of internal friction angle are studied for the sensitivity analysis of 9 rock mass parameters. (3) the sensitivity of cohesive force and internal friction angle change curve is studied. By using FLAC3D numerical software, a simulation calculation scheme is designed to change the linear variation mode from initial value to residual value. The sensitivity of plastic zone volume and displacement under different nonlinear variation forms was observed. (4) on the basis of the above research, the sensitivity parameters are found to represent the concave and convex degree of the nonlinear curve of cohesive force and internal friction angle. It can ensure that the sensitivity parameter corresponds to the curve one by one. (5) case back analysis based on BP neural network and genetic algorithm displacement increment inverse analysis method, combined with engineering examples, the evolution law of mechanical parameters behind deep hard rock peak is studied.
【學(xué)位授予單位】：東北大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2013
【分類號(hào)】：TU45;TD313

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