Xiacun Tunnel Construction Monitoring And Back Analysis Of Rock Parameters From Measured Displacements

Tunnel construction monitoring is important in making sure safety,guiding construction,feedbacking information,correcting design plan and accumulating engineering data,so it is indispensable.This thesis is based on the monitoring of Xiacun tunnel.By construction monitoring,we got the result of monitoring section and predicted its last deformation as well as the time for lining construction. By using the back analysis method and FLAC3 D,we got the rock mass properties which conform to the actual situation.These equivalent properties are more valuable than that of laboratory experiment which reflect the mass properties of actual rock more precisely.The main tasks of this thesis are as follows.1) We investigate the project background and the condition of Xiacun tunnel which belongs to San-Liu highway(from Sanjiang county to Liuzhou city).Besides,we review the construction site and the construction technology.2) According to standard and actual situation,we conceived and carry out the monitoring plan of Xiacun tunnel seriously.Finally,we reorganized the data we get and handed in reports of construction monitoring.3) By using exponential function,hyperbolic function, logarithmic function respectively,we choose the most suitable regression analysis function,and using this function,we can predict the final deformation of rock and the suitable time for lining construction.4) We built a model and finish the back analysis on the basis of actual data of ZK5+760.At last, we found out parameters of surrounding rock which were suitable to the the actual situation.they were the reference resources of next construction and design combined with numerical simulation.By using monitoring data, we finished analysis of deformation by regression method.This can make tunnel construction monitoring result serves for site construction more effectively.We finished back analysis according to the monitoring data and got the rock properties.It provides us one more timesaving and more economical method,and gives us one reference for similar situation.Besides,it provides us a kind of reference for the usage of back analysis in tunnel engineering.