Advance pre-grouting construction method for underwater tunnel in case of fault zone

Abstract

The invention relates to an advance pre-grouting construction method for an underwater tunnel in case of a fault zone. As for the advance pre-grouting construction method for the underwater tunnel in case of the fault zone, the structure is simple, construction is convenient, cost is low, and construction safety can be ensured. According to the technical scheme, the construction method has the following steps that a, tunnel face advance geological forecast is carried out on the tunnel face of the underwater tunnel; b, advance drilling and core taking are carried out, and the water drainage structure of the tunnel face of the underwater tunnel and the location of a fault ahead are judged accordingly; c, advance pre-grouting parameters are determined according to the geological conditions, detected in the steps a and b, of surrounding rock in front of the tunnel face of the underwater tunnel; and d, advance drilling construction for advance pre-grouting is carried out through a drilling and grouting integrated machine, grouting for water shutoff is carried out through a conventional grouting device after drilling construction is completed, at this moment, the drilling and grouting integrated machine is moved to the next hole position, and when water is drained and the drainage amount of water is larger than 50L / s in the drilling process of the drilling and grouting integrated machine, the drilling and grouting integrated machine is adopted for grouting to stop water.

Description

technical field [0001] The invention relates to an advanced pre-grouting construction method for a fault zone in an underwater tunnel. It is suitable for tunnel projects in various industries such as roads, railways, water conservancy, and hydropower. Background technique [0002] Throughout the construction history of underwater tunnels at home and abroad, water gushing and mud inrush have occurred to varying degrees during the construction process. Due to the unlimited supply of water sources, once a water inrush occurs during the construction of an underwater tunnel, it is difficult to control the water, which will cause great harm and loss, and even lead to catastrophic accidents. In order to complete the construction of the underwater tunnel safely and quickly, it is necessary to pre-grout the randomly developed water outlet structures in the underwater tunnel in order to achieve the purpose of water stoppage and reinforcement of the surrounding rock. [0003] To impl...

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Problems solved by technology

[0004] The problems in the above conventional methods are: 1. The geological survey method is a macro-discrimination method with low accuracy; the geophysical results can only roughly judge the location and scale of unfavorable geological bodies, and the results of interpretation are ambiguous

2. The advanced pre-grouting parameters are unreasonable, and targeted grouting cannot be carried out according to the actual geological conditions, resulting in a substantial increase in construction period and cost

3. If a large flow of groundwater is exposed during the advance pre-grouting drilling process, it is necessary to replace the drilling equipment and install the grouting equipment. The process is complicated, time-consuming and labor-intensive, the water cannot be blocked quickly, and the cost of pumping and drainage is increased.

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