Shield excavating method of tunnel containing boulder and bed rock salient stratum

Abstract

The invention discloses a shield excavating method of a tunnel containing a completely weathered granite boulder development stratum and a bed rock salient section. Pertinent excavating methods are provided for the completely weathered granite boulder development stratum and the bed rock salient section correspondingly, the construction method adopting sequential detection and treatment is adoptedfor the completely weathered granite boulder development stratum, and the method of mid-sea explosion and grouting reinforcement is adopted for the bed rock salient section for construction. The damage probability of a cutterhead and a shield main bearing are greatly reduced, the influences on shield excavating are basically eliminated, and subsea tunnel shield construction is safely and smoothlycarried out.

Description

technical field [0001] The invention relates to a method for treating a special stratum in shield construction, in particular to a tunnel shield excavation method including boulders and bedrock raised strata. Background technique [0002] The spherical weathered body (solitary rock) has a great influence on the construction of the shield. When the shield is advancing, the boulder is easy to roll along with the cutter head, hindering the excavation of the cutter head. Disc wear causes the strength and rigidity of the cutter head to decrease, making it impossible to excavate. The uneven force on the cutter head results in damage to the main bearing or damage to the seal, and damage to the cutter head. In addition, during tunnel shield construction, hard boulders or bedrock protrusions often intrude into the shield tunneling route. If the shield tunneling is carried out directly, it is easy to cause damage to the shield cutterhead, causing danger and delaying the construction p...

AI Technical Summary

Problems solved by technology

[0002] The spherical weathered body (solitary rock) has a great influence on the construction of the shield. When the shield is advancing, the boulder is easy to roll along with the cutter head, hindering the excavation of the cutter head. Disc wear causes the strength and rigidity of the cutter head to decrease, making it impossible to excavate. Uneven force on the cutter head results in damage to the main bearing or damage to the seal, and damage to the cutter head

In addition, during tunnel shield construction, hard boulders or bedrock protrusions often intrude into the shield tunneling route. If the shield tunneling is carried out directly, it is easy to cause damage to the shield cutterhead, causing danger and delaying the construction period. Therefore, it is often necessary to pre-process the above-mentioned special strata to ensure safe and efficient shield tunneling operations in this stratum.