基于岩石试验的深部巷道破裂围岩变形分区研究

Study on Deformation Zoning of Fractured Surrounding Rock of Deep Roadway Based on Rock Test

考虑围岩流变特性,并结合深巷岩石全应力—应变试验曲线表现出峰后流动与跌落破坏的特征,将巷道围岩分为弹性区、塑性硬化区、塑性流动区和破裂区;然后,基于Drucker-Prager准则推导了围岩各分区应力、位移及半径的封闭解析;最后,结合工程实例对比分析了三种不同分区模型下的围岩应力分布规律及松动圈范围。研究结果表明:基于岩石试验建立的分区模型得到的计算结果与工程实际吻合最好。由此可见,依据岩石试验采用合理且符合工程实际的分区模型及理论至关重要。研究结果可为类似巷道长期稳定性评估和支护设计定量提供一定借鉴。

Surrounding rock in deep roadway is divided into elastic zone,plastic hardening zone,plastic flowing zone and cracked zone by considering its rheological property and the post-peak flowinga nd dropping failure on the complete stress-strain curves of rock.Then,the closed-form analytical solutions of stress,displacement and radius in each area are derived based on the Drucker-Prager criterion.Finally,the stress distributions and broken rock zones based on three different partition models are contrasted by using an engineering example.Study results show that the calculation results based on the partition model established by rock test agree best with the engineering practice.So it can be seen that it is very important to adopt a reasonable and practical division model and theory according to rock test.Research results in this paper can provide a certain theoretical reference for long-term stability evaluation and support design quantification of similar roadway.