摘要
基于自行研制的重力加载流变仪,采用多级加载对4种典型矿岩开展了三点弯曲蠕变试验研究,获得了蠕变试验曲线.将Burger's模型与Mohr-Coulomb准则相结合,形成改进的Burger's模型.并通过最小二乘法对均质混合岩进行蠕变参数拟合,获得了与蠕变试验曲线相吻合的蠕变理论曲线.结果表明改进的Burger's模型能较好地描述均质混合岩的蠕变特性.在此基础上,采用该流变模型,对返修后的竖井工程进行三维流变数值模拟和稳定分析,为竖井工程的长期稳定预测和失稳风险预测提供了理论依据.
According to actual demand of Jinchuan No.3 minefield, a set of bend creep experiments was performed to study the creep behavior of typical four ore-rocks under step increment load by the developed gravitation-style rock creep test machine. The creep properties of the ore-rocks were experimentally obtained. A new viscoelastic-plastic model of homogenous mixed rock, named improved Burger＇s creep model, was then established by combining the Burger＇s creep model and experimental data with Mohr-Coulomb criterion, whose parameters values were achieved by using a mixed technique of pattern search and non-linear least -square regression. The theoretic curves of the improved Burger＇s creep model are in good greement with those of the creep tests for homogenous mixed rock, to show that the improved Burger＇s creep mode can be applied to describe the creep characteristic of homogenous mixed rock. Furthermore, based on creep parameters values, the three -dimensional creep numerical simulation of repaired main shaft and its horsehead engineering was conducted by adopting the improved Burger＇s creep model. Reasonable suggestion and evaluation for the long-term stability and safety of repaired main shaft were put forward on the basis of the simulaton results.
出处
《力学学报》
EI
CSCD
北大核心
2010年第3期474-481,共8页
Chinese Journal of Theoretical and Applied Mechanics
基金
国家"十一五"支撑资助项目(2008BAB32B01)~~
