深部硬岩峰后力学参数演化规律研究

发布时间：2018-11-15 08:36

【摘要】：在21世纪的今天,国内外岩体工程发展十分迅速,越来越多的涉及到了能源、交通、矿山、水利和国防工程的建造。目前这些工程要面对大量的岩体的开挖和处理问题,涉及到大量的岩体工程性质。而岩体本身的强度特性以及岩体峰后的力学性质对这些工程的设计、施工和稳定性评价、岩土加固等都有直接的影响。因此本文采用数值模拟方法对地下工程的断面开挖进行模拟,与实测数据进行对比分析,研究峰后力学参数的演化规律。本文的主要工作包括： (1)深部硬岩峰后力学特性理论研究通过在数据库中的搜索学习,深入了解深部硬岩峰后力学特性的理论知识,同时加入自己的理解,研究、学习他人的研究成果,巩固自己后续研究工作的理论基础。 (2)岩体力学参数敏感性研究利用FLAC3D数值软件,设计模拟计算方案,对弹性模量、泊松比、抗拉强度、初始粘聚力、残余粘聚力、初始内摩擦角、残余内摩擦角、粘聚力临界应变值、内摩擦角临界应变值9个岩体参数进行敏感性分析研究。 (3)粘聚力和内摩擦角变化曲线敏感性研究利用FLAC3D数值软件,设计模拟计算方案,改变两者从初始值到残余值的线性变化方式,观察塑性区体积和位移在不同非线性变化形式下的敏感性。 (4)寻求敏感性参数在以上的研究基础上,寻求敏感性参数表征粘聚力和内摩擦角非线性变化曲线的凹凸程度,在划定的取值范围内,能够保证敏感性参数与曲线一一对应。 (5)实例反分析基于BP神经网络和遗传算法位移增量反分析方法,结合工程实例,研究深部硬岩峰后力学参数的演化规律。
[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.
【学位授予单位】：东北大学
【学位级别】：硕士
【学位授予年份】：2013
【分类号】：TU45;TD313

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