论文部分内容阅读
为了实现在实验室进行巷道(隧道)开挖卸荷过程的模拟,获得对围岩试件进行开挖卸荷试验的创新性监测方法与成套试验技术,研制了一套可以使用小型围岩试件模拟与再现巷道围岩开挖卸荷路径的试验系统。该系统主要由3个独立的子系统组成:(1)系统I:SAM–3000型微机控制电液伺服岩石三轴试验系统;(2)系统II:小型巷道围岩试件加、卸载腔;(3)系统III:声波–声发射一体化测试系统。通过对3个子系统进行软、硬件集成与调试,获得了小型巷道围岩试件级别(高290 mm,外径200 mm,内径100~150 mm)的开挖卸荷过程的室内模拟与再现。使用小型巷道围岩试件进行了初步的开挖卸荷试验研究,结果表明,所构建的试验系统可以有效地模拟:巷道围岩的开挖卸荷条件;巷道围岩在开挖卸荷条件下的变形规律、应力分布特征和破坏机制等。
In order to realize the simulation of roadway (tunnel) excavation and unloading process in the laboratory and obtain the innovative monitoring method and complete set of test technology for the excavation and unloading test of the surrounding rock specimen, a set of test methods A Test System for Simulating and Reproducing the Unloading Path of Surrounding Rock Excavation in Roadway. The system consists of three independent subsystems: (1) System I: SAM-3000 microcomputer controlled electro-hydraulic servo rock triaxial test system; (2) System II: small tunnel surrounding rock specimen plus and unload chamber; (3) System III: Acoustic-Acoustic Emission Integrated Test System. Through the software and hardware integration and debugging of the three subsystems, the indoor simulation and reproduction of the excavation and unloading process of surrounding rock specimen level (height 290 mm, outer diameter 200 mm, inner diameter 100-150 mm) of small roadway are obtained. The preliminary tests on excavation and unloading are carried out by using small tunnel surrounding rock specimens. The results show that the constructed test system can effectively simulate the excavation and unloading conditions of surrounding rock; Under the deformation laws, stress distribution characteristics and damage mechanisms.