A full-face rock formation construction method in which the mud-water shield develops cracks

Abstract

The invention discloses a method for constructing a mud-water shield in a full-face rock stratum in which fissures develop, comprising the following steps: step 1, setting a water-stop hoop at the tail of the shield 3m before the fissure zone; step 2, the process of crossing the fissure zone In the process, strictly control the tunneling parameters and operation methods, review the posture of the shield machine and segments, reduce the initial setting time of mortar, and increase the proportion of mud; step 3, add grouting hole segments, and use full-length channel steel for tensioning ; Step 4, after passing through the 3m range of the fissure zone, set up a water-stop hoop at the tail of the shield; Step 5, after all the shield machine trailer equipment passes through the fissure zone, perform backfill grouting on the back of the fissure zone and the front and rear 5 ring range segments; Step 6, carry out deep hole grouting in the formation, and reinforce the cracks in the rock formation. The beneficial effect of the construction method of the mud-water shield in the full-section rock formation with developed fissures of the present invention has the characteristics of strong practicability, simple operation, effective protection of shield excavation safety, quality of formed tunnels, and safety of trains during operation, etc.

Description

technical field [0001] The invention belongs to the technical field of tunnel construction, and in particular relates to a full-section rock layer construction method in which a mud-water shield develops in cracks. Background technique [0002] In recent years, with the rapid development of cities, there are more and more rail transit constructions in cities. The shield tunneling method has been widely used in the construction of urban rail intervals because of its fast construction and little impact on the ground. The shield machine is a special engineering equipment for tunnel excavation. It has the functions of excavating and cutting soil, conveying soil muck, assembling tunnel lining, measuring, guiding and correcting deviation. In cities on both sides of the river, it is often necessary for the muddy water shield machine to pass through the river. If it encounters a full-section rock formation with developed cracks, it is easy to cause difficulty in slag discharge, the ...

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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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