CAJ | 학술논문

采用在预定围压下先固结后径向卸载的三轴蠕变试验方法，模拟软岩巷道开挖过程应力状态变化，通过三轴卸载剪切蠕变试验表明随剪应力水平的降低蠕变速率显著减小。当剪切应力高于一临界值时，深部矿井软岩蠕变过程历经减速、定常和加速蠕变三个阶段破坏。根据试验结果，为描述非线性加速阶段蠕变规律，采用改进的元件，提出了软岩非线性的黏弹塑蠕变本构模型，通过有限元本构程序的二次开发，将提出的本构模型嵌入到ADINA非线性有限元程序中。对某矿井巷道软岩开挖支护过程进行数值模拟，表明弹黏塑蠕变本构力学模型能够较好地反映软岩的变形特征，数值模拟和实测结果吻合良好，可为矿井深部软岩巷道设计与施工提供参考。
채용재예정위압하선고결후경향사재적삼축연변시험방법，모의연암항도개알과정응력상태변화，통과삼축사재전절연변시험표명수전응력수평적강저연변속솔현저감소。당전절응력고우일림계치시，심부광정연암연변과정력경감속、정상화가속연변삼개계단파배。근거시험결과，위묘술비선성가속계단연변규률，채용개진적원건，제출료연암비선성적점탄소연변본구모형，통과유한원본구정서적이차개발，장제출적본구모형감입도ADINA비선성유한원정서중。대모광정항도연암개알지호과정진행수치모의，표명탄점소연변본구역학모형능구교호지반영연암적변형특정，수치모의화실측결과문합량호，가위광정심부연암항도설계여시공제공삼고。
The stress alteration in the course of tunneling through soft rock was simulated. Under predetermined confining pressure and by consolidation and then unloading, a tri-axial creeping experiment was conducted. The tri-axial unloading shearing creeping experiment indicated that with the shearing stress decreasing, the creeping rate apparently went down. When the shearing stress reached above the critical value, the creep of the deep soft rock experienced three damage stages, i.e. decelerating, being constant and accelerating. In accordance with the results of the experiments, in order to describe the rules of creep in the stage of the nonlinear accelerating damage, a nonlinear visco-elasto-plastic soft rock creeping constitutive model was constructed by using a modified element. A secondary development was conducted of the finite element procedure and the constitutive model developed was embedded in the large nonlinear finite element program ADINA. Upon the completion of the above-mentioned work, a numerical simulation was conducted with the supporting process while tunneling in the soft rock strata was done in a coal mine. The results indicate that the constitutive model for the elasto-visco-plastic creeping can tell quite precisely the deformation characteristics of soft rock strata. The actual measurement results are well in agreement with those of the numerical simulation, showing that our achievement can be used as a reference for the design of roadways in deep soft rock and for corresponding tunneling performance.