深部损伤岩体弹性模量的确定方法

发布时间：2018-03-09 10:35

本文选题：深部岩体　切入点：弹性模量　出处：《东北大学》2013年硕士论文　论文类型：学位论文

【摘要】：近年来,国内许多矿山已经由浅部开采转入深部地下开采,随着开采深度的增加,高地应力问题对工程的影响越发明显,特别是矿山采场在进行爆破落矿时的力学行为对岩体的扰动作用更加突出。深部高地应力环境下矿山开挖过程中围岩表现出特殊的非线性力学行为使得传统的岩体(石)力学理论与分析方法面临着新的挑战。深部地下洞室在开挖过程中,洞室表层围岩会出现大量微破裂,在二次应力场调整过程中,这些微破裂逐步扩展贯通导致围岩的完整性逐步降低。由于表层围岩出现片帮、板裂以及塌落等现象,现场难以通过钻孔取样对表层损伤区岩块的弹性模量进行测试,从而无法确定损伤岩体的弹性模量。主要研究内容如下： (1)基于损伤力学原理和岩石力学理论,采用岩石的损伤变量来研究损伤岩体的弹性模量,结合现场钻孔声波测试技术及泊松比、岩体密度与岩体波速等经验公式,确定损伤变量。 (2)以抚顺红透山铜矿-707中段27采场为工程研究背景,在结合现有金属矿深部地下开采工程研究的基础上,采用声波测试、钻空摄像等多种手段对现场进行监测,结合数值模拟计算的方法及经验公式,对损伤岩体的弹性模量进行初步判断,确定其大致范围。 (3)采用遗传算法和神经网络以及利用均匀设计理论和遗传神经网络相结合的反分析方法,结合损伤本构模型RDM对岩体的弹性模量进行精确反演,进而获得损伤岩体弹性模量的分布规律,划定采场围岩损伤区,得到围岩损伤等级划分量化指标,并得出围岩损伤随时间分布演化规律。
[Abstract]:In recent years, many mines in China have changed from shallow mining to deep underground mining. With the increase of mining depth, the influence of high geostress on engineering is becoming more and more obvious. In particular, the mechanical behavior of mine stope during blasting and mining has a more prominent disturbance effect on rock mass. Under the environment of deep and high ground stress, the surrounding rock shows special nonlinear mechanical behavior, which makes the traditional rock. The theory and analytical method of mass (stone) mechanics are facing new challenges. During the adjustment of the secondary stress field, these micro-fractures gradually extend through and lead to the gradual decline of the integrity of the surrounding rock. Due to the appearance of the surface wall rock, the slab crack and collapse, and so on, are caused by a large number of micro-fractures in the surrounding rock surface of the cavern, and during the adjustment of the secondary stress field. It is difficult to measure the elastic modulus of the rock block in the surface damage area by drilling sampling in the field, so that the elastic modulus of the damaged rock mass can not be determined. The main research contents are as follows:. 1) based on the theory of damage mechanics and rock mechanics, the elastic modulus of damaged rock mass is studied by using the damage variable of rock, combined with the field drilling acoustic wave testing technique, Poisson's ratio, density of rock mass and wave velocity of rock mass, etc. Determine the damage variable. Taking the 27 stope of the middle section of -707 copper mine in Fushun Hongtoushan Copper Mine as the engineering research background, based on the research of the deep underground mining engineering of the existing metal mine, the field monitoring is carried out by various means, such as sound wave test, aerial camera and so on. Combined with the method of numerical simulation and empirical formula, the elastic modulus of damaged rock mass is preliminarily judged and its general range is determined. 3) using genetic algorithm and neural network, combining uniform design theory with genetic neural network, and combining with damage constitutive model RDM, the elastic modulus of rock mass is accurately inversed. Then the distribution law of elastic modulus of damaged rock mass is obtained, the damage zone of surrounding rock in stope is delineated, the quantitative index of damage grade of surrounding rock is obtained, and the law of damage distribution and evolution of surrounding rock with time is obtained.
【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】：TD313

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