流变特性引起围岩应力场演变规律分析  

Analysis of the Evolution Rule of Surrounding Rock Stress Field Induced by Rheological Property

作　　者：王波[1] 高延法[2] 夏方迁[2] 

机构地区：[1]煤炭科学研究总院北京天地华泰采矿工程技术有限公司,北京100013 [2]中国矿业大学力学与建筑工程学院,北京100083

出　　处：《采矿与安全工程学报》2011年第3期441-445,共5页Journal of Mining & Safety Engineering

基　　金：国家重点基础研究发展计划(973)项目(2007CB209400);天地科技青年创新基金(TZ-JJ-10-HT-2)

摘　　要：为了研究流变特性引起围岩应力场演变规律,分析了巷道开挖完成后,围岩的应力状态,得出围岩应力峰值点位于塑性区与弹性区的交界处;选取西原模型计算软岩的流变过程,在计算过程中,提出了三向应力状态下围岩应力峰值点发生转移的判据;结合典型软岩巷道-龙口海域巷道流变实验成果,给定一个极小的时步Δt,在σ(x,t)作用下将会产生一个应变增量Δε,当围岩应力峰值点位置发生变化时,应力重新分布,形成新的应力分布σ′(x,t),编制计算程序,计算得出不同时刻的应力分布情况和围岩应力峰值位置.根据计算结果,得出了巷道开挖后围岩应力峰值的转移规律,并得出围岩应力峰值点会最终趋于某一位置.In order to analyze the evolution rule of surrounding rock stress field induced by rheological property,we firstly analyze the stress condition of surrounding rocks after the roadway excavation,showing that the surrounding rock stress peak is in the juncture between the plastic region and the elastic region.In the computational process,we choose the Nishihara model to calculate the rheological process and propose the criterion for the transfer of surrounding rock stress peak under a 3-D stress condition.Based on the rheological experiment for a typical soft-rock project in the roadway in Longkou sea area,there is a strain increment Δε under the action of σ（x,t） when Δt is given.When the position of peak value changes,the stress σ′（x,t） will be redistributed.Therefore,we programm a computational procedure to calculate the stress distribution and peak position at different time.The result shows the peak transition rule after the roadway excavation and obtain that the stress peak point tends to a certain position at last.

关 键 词：软岩巷道 岩石流变 应力场演变规律 

分 类 号：TU457[建筑科学—岩土工程]