TBM passing construction method in unfavorable geological section

Abstract

The invention discloses a TBM passing construction method in an unfavorable geological section. The TBM passing construction method in the unfavorable geological section comprises the following stepsthat (1) a tunneling parameter is abnormal and the tunneling is suspended; (2) advanced geological prediction and drainage are carried out; (3) pre-reinforcing is carried out on the front part of a tunnel face and the radial surrounding rock of a cutterhead; (4) the cutterhead is cleaned and the tunneling length is determined and the tunneling is recovered; (5) primary supporting of a shield tailis carried out; and (6) cyclic reinforcement and the tunneling are carried out. According to the TBM passing construction method in the unfavorable geological section, the front part of the tunnel face and the radial surrounding rock of the cutterhead are pre-reinforced by adopting an active shutdown method, the probability of the TBM jamming is reduced, the supporting quality is guaranteed, and grippers are prevented from sinking due to the stress difference of the surrounding rock; and a stratum can be rapidly improved in a short time, so that continuous collapse of the tunnel face is avoided, the TBM passing construction method has the characteristics that the processing speed is fast for the localized unfavorable geology, the secondary collapse caused by long-time shutdown geological deterioration is prevented, the construction period effect is good, and the cost is greatly reduced by adopting the method compared with hundreds or even thousands of detrapped treatment cost after theTBM jamming.

Description

technical field [0001] The invention relates to the technical construction field of tunnel TBM, in particular to a construction method for passing a TBM in an unfavorable geological section. Background technique [0002] At present, in the construction process of large and long tunnels, TBM excavation is widely used for the consideration of high efficiency, environmental protection and safety. However, the tunneling construction often encounters the development of joints and fissures, broken rock mass, poor self-stabilization ability, and unfavorable geological sections with developed groundwater. Due to the easily broken and loose surrounding rock, water softening and alteration, cementation and poor stability, tunneling occurs during TBM tunneling. The parameters are abnormal, the thrust decreases rapidly, the torque increases greatly, the pressure of the belt conveyor increases, the knife hole is blocked, and the propulsion speed is abnormally slow. When this phenomenon o...

AI Technical Summary

Problems solved by technology

However, the tunneling construction often encounters the development of joints and fissures, broken rock mass, poor self-stabilization ability, and unfavorable geological sections with developed groundwater. Due to the easily broken and loose surrounding rock, water softening and alteration, cementation and poor stability, tunneling occurs during TBM tunneling. The parameters are abnormal, the thrust decreases rapidly, the torque increases greatly, the pressure of the belt conveyor increases, the knife hole is blocked, and the propulsion speed is abnormally slow. When this phenomenon occurs, if it is not handled in time, it may cause large-scale collapse and continuous Excessive slag discharge, TBM cutterhead and shield being stuck, etc.

After the TBM jamming accident, it may be necessary to use the shield tail guide hole to escape the cutter head, artificial drilling and blasting to go around the hole, etc. A series of TBM rescue constructions not only increase the workload of the tunnel construction, but also cause the jamming accident. It usually takes 2-5 months, or even 1 year to grow up, which seriously affects the construction period of the entire tunnel compared with the normal construction of tunnel excavation.

Even after some TBM jamming accidents occurred, some TBMs failed to get out of trouble and were forced to abandon the TBM for rerouting, which caused great losses