Construction method of slurry shield in fracture-development full-section rock stratum

Abstract

The invention discloses a construction method of a slurry shield in a fracture-development full-section rock stratum. The method includes the following steps that step 1, water stopping hoops are arranged in the position 3 m before a fractured zone and at the shield tail; step 2, in the process of passing through the fractured zone, tunneling parameters and the operating manner are controlled strictly, the posture of a shield tunneling machine and the postures of duct pieces are rechecked, the initial setting time of mortar is shortened, and the specific gravity of the mortar is increased; step 3, grouting hole duct pieces are added, and through U-steel is used for tensioning; step 4, water stopping hoops are arranged in the position 3 m behind the fractured zone and at the shield tail; step 5, after all shield tunneling machine vehicle recovery equipment passes through the fractured zone, back filling grouting is performed on the backs of the duct pieces in the fractured zone and in the range of 5 hoops before and behind the fractured zone; and step 6, stratum deep-hole grouting is performed, and the fracture of the rock stratum is reinforced. The construction method of the slurryshield in the fracture-development full-section rock stratum has the beneficial effect that the method has the characteristics of high practicability, convenience in operation, capability of effectively guaranteeing the shield tunneling safety, guaranteeing the quality of a formed tunnel and guaranteeing the train traveling safety in the running period and the like.

Description

Technical field [0001] The invention belongs to the technical field of tunnel construction, and in particular, relates to a construction method for a full-face rock formation with a mud-water shield in a crack developed. Background technique [0002] In recent years, with the rapid development of cities, there have been more and more rail transit constructions in cities. The shield method has been widely used in the construction of urban rail sections because of its rapid construction and small impact on the ground. Shield machine is a kind of special engineering equipment for tunnel excavation, which has the functions of excavating and cutting soil, conveying soil ballast, assembling tunnel lining, measuring guide deviation and correcting deviation. In cities on one river and two banks, mud-water shield machines are often required to cross the river. In case of full-face rock formations with developed fissures, during the passage of the shield machine, it is easy to cause diffic...

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Problems solved by technology

[0004] The above-mentioned technology solves the safety of shield machine excavation, but also increases the cost of human resources and property, and does not solve the problem that the vibration generated during the operation of the train will cause the cracks to continue to develop and cause groundwater to directly impact the tunnel, and the tunnel is prone to uneven settlement. The fragments were broken and leaked water, which affected the safe operation of the tunnel

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