Analytical solution for a circular roadway considering the transient effect of excavation unloading  

作　　者：Feng Qiang Jiang Binsong Wang Gang Hu Chuanpeng 

机构地区：[1]College of Civil Engineering and Architecture, Key Laboratory of Civil Engineering Disaster Prevention and Mitigation, Shandong University of Science and Technology,Qingdao 266590, China [2]State Key Laboratory for Geomechanics and Deep Underground Engineering, China University of Mining and Technology, Xuzhou 221116, China

出　　处：《International Journal of Mining Science and Technology》2016年第4期543-549,共7页矿业科学技术学报（英文版）

基　　金：supported by the National Natural Science Foundation of China (Nos.51479108 and 51174196);the National Basic Research Program of China (No.2014CB046300);Shandong University of Science and Technology (No.2012KYTD104);Research Start-up Project of Shandong University of Science and Technology (No.2015RCJJ061)

摘　　要：The rocks surrounding a roadway exhibit some special and complex phenomena with increasing depth of excavation in underground engineering.Quasi-static analysis cannot adequately explain these engineering problems.The computational model of a circular roadway considering the transient effect of excavation unloading is established for these problems.The time factor makes the solution of the problem difficult.Thus,the computational model is divided into a dynamic model and a static model.The Laplace integral transform and inverse transform are performed to solve the dynamic model and elasticity theory is used to analyze the static model.The results from an example show that circumferential stress increases and radial stress decreases with time.The stress difference becomes large gradually in this progress.The displacement increases with unloading time and decreases with the radial depth of surrounding rocks.It can be seen that the development trend of unloading and displacement is similar by comparing their rates.Finally,the results of ANSYS are used to verify the analytical solution.The contrast indicates that the laws of the two methods are basically in agreement.Thus,the analysis can provide a reference for further study.The rocks surrounding a roadway exhibit some special and complex phenomena with increasing depth of excavation in underground engineering. Quasi-static analysis cannot adequately explain these engineering problems. The computational model of a circular roadway considering the transient effect of excavation unloading is established for these problems. The time factor makes the solution of the problem difficult. Thus, the computational model is divided into a dynamic model and a static model. The Laplace integral transform and inverse transform are performed to solve the dynamic model and elasticity theory is used to analyze the static model. The results from an example show that circumferential stress increases and radial stress decreases with time. The stress difference becomes large gradually in this progress. The displacement increases with unloading time and decreases with the radial depth of sur- rounding rocks. It can be seen that the development trend of unloading and displacement is similar by comparing their rates. Finally, the results of ANSYS are used to verify the analytical solution. The contrast indicates that the laws of the two methods are basically in agreement. Thus, the analysis can provide a reference for further study.

关 键 词：Excavation unloading Transient effect Circle roadwayAnalytical solution Laplace integral transform Den lseger method 

分 类 号：TD313[矿业工程—矿井建设]