Study On The Deformation Detection And Treatment Of The Tunnel Bottom Of Zhaojiayan

With the rapid development of China's high-speed railway tunnel project,growing and deep-buried tunnels are increasing day by day.Tunnel deformation often occurs in soft surrounding rock.Floor-bulge is one of the forms of deformation and failure of soft surrounding rock.Once the tunneling floor-bulge occurs,its deformation is usually continuous and hard to be self-stabilized.The continuous development of floor heave deformation will lead to the cracking deformation and failure of tunnel lining,which will cause safety problems for the project.Based on the study of the monitoring and treatment measures scheme of the bottom deformation in the section from K367.0 to K368.7 of zhaojiayan tunnel in xicheng kezhuan,this paper analyzes the monitoring data through the establishment of the monitoring and measurement scheme(compatible operation period),and puts forward the treatment countermeasures to effectively control the bottom drum deformation in combination with the geological conditions.1.Trough the tunnel during the construction stage,preliminary acceptance,static acceptance monitoring measurement data analysis and field investigation,exploration,it is concluded that the deformation of the tunnel at the bottom of the main reason for the surrounding rock is given priority to with thin to middle of soft rock,change of occurrence,and the secondary stress adjustment after the construction of the tunnel surrounding rock,the local stress concentration in the soft rock at the bottom of the creep curvature and thickness of sections of inverted arch construction,does not meet the design requirements.2.According to the time of deformation process,combined conventional monitoring with automatic monitoring,and combined with the factor control of joint debugging test and official operation,proposed the design of monitoring section,the configuration of monitoring equipment and reasonably compiled the measurement scheme for long-term deformation monitoring.3.Through the control analysis of the monitoring measurement values,draw the time displacement curve and analyze the stress on the structure of each part of the tunnel,and obtain the relevant deformation.4.According to the analysis results of monitoring data,this paper adopts the ANSYS finite element software of load-structure model to determine all kinds of calculation parameters,and it is concluded that it is effective for such deformation to improve the curvature of invert,increase the anchorage of invert and use reinforced concrete materials for reinforcement.