深埋隧洞围岩及其支护结构内力与变形监测结果分析与研究

Analysis and Research of the Stress and Deformation Monitoring Result for the Surrounding Rock and Supporting Structure in Deep Tunnel

锚网支护是巷道支护主要结构形式,不同工况采用的支护结构不同。为了验证新型支护结构系统的支护效果,以现场工业试验为研究背景,通过对新型支护结构系统支护巷道的现场监测,重点对围岩的表面位移、锚杆受力状态、围岩深部变形等参数进行监测。通过对监测结果的分析,得到了以下结论:新型支护结构是一种柔性支护结构,能够与巷道围岩协调变形,并能保持足够的工作载荷且有部分余量,在设计允许范围内支护结构整体工作状态良好;通过对巷道深部位移、巷道表面位移、锚杆离层观测等参数的分析,得出锚固后的围岩体变形可以采用半对数函数进行拟合,同时,锚固后的围岩体在适度变形后整体变形量趋近于稳定状态,充分说明新型支护结构系统能有效改善围岩的变形,有效地提高了围岩的稳定性。

Shotcrete-bolt-net support is the main structure form of deep tunnel＇s supporting,and different support structure is adopted in the different working conditions. In order to verify the supporting effect of the new supporting structure system,taking the field tunnel industrial test as the research background and through the field monitoring of the support system with the new type support structure system,parameters of the surface displacement of the wall rock,the stress state of anchor bolt and the deformation inside surrounding rock are mainly monitored. The analysis of the monitoring results have indicated：the new supporting structure is a kind of flexible supporting structure,and it can deform in coordination with the surrounding rock deformation. And it is able to maintain sufficient working load and even some leavings,and the supporting structure is in good working condition within its design range. Through analysis on the inside displacement of tunnel wall rock,the tunnel surface displacement,and the bolt separation,it is concluded that the deformation of surrounding rock mass can be fitted by semi logarithmic function. At the same time,the whole deformation of the surrounding rock approaches to the steady state after anchored. It is fully approved that the new supporting structure system can effectively improve the deformation of surrounding rock,and increase effectively the stability of surrounding rock.