节理岩体蠕变特性试验研究

Testing Study on Creep Characteristic of Jointed Rock Mass

某矿地处高应力区,岩体破碎、节理裂隙发育,且具有显著流变性,开挖与维护难度极大,给正常生产和工程安全带来巨大挑战,因此,岩体蠕变规律研究成为一项重要的基础工作.为此,根据试验要求及实际取样情况,对该区节理岩体的蠕变特性进行了试验研究.在对试验数据深入分析和对比研究的基础上,选取Burgers模型来描述岩体的蠕变特性,并编制了Burgers蠕变模型试验数据处理程序,对蠕变模型参数进行了拟合和加权平均取值.试验结果表明,Burgers蠕变模型能较好的描述岩体的蠕变特性.

A mine is characterized with high crustal stress, cracked rock mass, overgrown joint and remarkable rheological characteristic. And the huge difficulties in excavation and maintenance are bringing lots of enormous challenges to the common production and the engineering safety. Therefore, the study on creep rule of the rock is an important basic work. For this reason, according to some given requirements and actual sampling specimens, a set of creep experiments is made to study the rheological characteristic of the jointed rock mass. Based on scientific analysis and compared study, Burgers creep model is adopted to describe the characteristic of rock creep. And some programs about Burgers model are developed to deal with the testing data. The creep characteristic curves are obtained, and the model parameters are fitted and the values are achieved through weighted mean. The testing results show that the Burgers creep model is felicitous to characterize the creep rule.