Study Of Bolt And Anchor Support Structure On Soft Rock Tunnel

There are many factors influencing the deformation of soft rock,and there is no uniform design experience in the soft rock tunnel supporting parameters.Based on the actual engineering of Qijiamiao Tunnel in Weiyuan County,the paper takes YK127 +430 and YK127 + 460 tunnel sections as the support,and takes the anchor and the cable support as the research object in soft rock tunnel supporting structure,On the Qijia temple tunnel vault sinking and clearance convergence of the site monitoring measurement;And the Midas / GTS finite element software was used to simulate the bolts and anchors in different lengths.The results of the two support methods were compared and analyzed.The main results are as follows:1.Soft rock tunnel section of the retaining structure of the surrounding rock deformation is large,the rate of change is also faster,the deformation of the support by a greater impact.2.The analysis of the test data of the sinking and clearance of the vault shows that the method of long bolt support has a good effect on controlling the vault sinking in the construction of tunnel section.3.Through the numerical simulation and comparison,it can be seen that the maximum displacement of anchor and anchor support occurs at the top and the arch,and the maximum of the simulation results can meet the design requirements.4.Compared with the stress of anchor and anchor,it can be seen that the maximum stress is at the orifice,and the stress decreases gradually with the distance from the hole.The stress value is almost trapezoidal.The stress in the anchor and the anchor increases with the length of the anchor.5 The field test data and numerical simulation results show that in the soft rock tunnel,long bolt support can ensure the safety of the tunnel construction,shorten the construction time and save the engineering materials.