Monitoring And Analysis For Surrounding Rock Stability Of HuiTougou Tunnel

Currently in the construction process of road and rail tunnels, will inevitably encounter bias phenomenon, there is a bias phenomenon, people are very concerned about the topics what impact it will force surrounding rock deformation and stress distribution and lining structure.it is very important to undertake studies to guide the design and construction of the tunnel bias.This article is based on the project of Heda highway tunnel, starting from the geological conditions, analyze the reasons for its bias generated to determine the bias range segment, segment selection bias in monitoring sections, the monitoring program design; by obtaining the monitoring data analysis, stress of surrounding rock tunnel evolution bias, bias tunnel surrounding the possible failure modes, determine long-term safety and reliability of tunnel lining structure, mainly made the following findings:(1) In its engineering geological conditions, engineering before full investigation determined based on the bias back ditch tunnel bias caused by the type of terrain;(2)On the basis of construction specifications and the collection of relevant data, combined with back tunnel on the actual situation of the monitoring program has been designed and field equipment layout;(3)Through the tunnel face quantitative surrounding rock classification and grading results timely feedback design and construction units to provide technical support for the design changes;(4) Based on the monitoring results of the analysis, the amount of displacement of surrounding rock deformation law of surrounding rocks in the same location at the spandrel, large depth is shallow on one side more than one side of the arch in the surrounding rock displacement law at the opposite wall, according to the variation of the amount of displacement should focus on strengthening support greater intensity on one side;(5)Through long-term monitoring of stress and strain on the lining of the tunnel, to determine the tunnel lining stability of this tunnel construction method used reasonable and effective.