A microbial grouting method for soft soil shield tunnel lining segment wall
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A shield tunnel and lining segment technology, which is applied in tunnels, earthwork drilling, mining equipment, etc., can solve the problems of shield tunnel durability impact, water stop failure, etc., and achieve long-term improvement of erosion performance and good stability , the effect of reducing the permeability coefficient
Active Publication Date: 2018-10-23
SOUTHEAST UNIV
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However, reinforced concrete structures are prone to micro-cracks in the prefabrication process, as well as defects such as cracks and cracks in the process of transportation and assembly, and waterstop failures and other diseases are often encountered in tunnel structures during operation. Tunnel durability impact
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Embodiment 1
[0024] The invention relates to a microbial grouting method after lining segment walls to improve the corrosion resistance and erosion performance of soft soil shield tunnels. The microbial bacteria used in this example are denitrifying bacteria, a strain of bacteria named Klebsiella sp.DB-1, and its enrichment medium is: peptone, KNO 3 , distilled water; separation medium: enrichment medium + agar; denitrifying bacteria medium: KNO 3 , potassium sodium tartrate, K 2 HPO 4 , distilled water.
[0025] The operation steps are as follows:
[0026] (1) One-time grouting can be performed according to the grouting method after the lining wall of the conventional shield tunnel.
[0027] (2) During the secondary grouting of tunnel construction, drill the grouting hole to the interface between the grouting layer and the outer soil layer, and the diameter of the drilling hole ensures that the grouting head can go deep;
[0028] (3) Before grouting, mix the dried denitrifying bacter...
Embodiment 2
[0034] The denitrifying bacteria used in this example are bacteria called Pseudomonas mendocina, the enrichment medium is Giltay medium, the separation medium is bacterial isolation medium, and the denitrifying bacteria medium is KNO 3 , potassium sodium tartrate, K 2 HPO 4 , distilled water.
[0035] Operation steps are identical with embodiment 1.
Embodiment 3
[0037] The denitrifying bacteria used in this example is a bacterium called diaphorobater nitroreducens R9, and its enrichment medium is Gilray medium, the separation medium is bacterial separation medium, and the denitrifying bacteria medium is NaNO 3 , NH 4 Cl, CH 3 OH, CaCl 2 , Distilled water.
[0038] Operation steps are identical with embodiment 1.
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Abstract
The invention provides a soft soil shield tunnel lining segment behind microorganism grouting method which is mainly used for a soft soil shield tunnel. In secondary grouting through the tunnel, prepared and cultured nutrient solution and denitrification bacteria capable of generating nitrogen and carbon dioxide gas are injected into a slurry outer soil layer together through a designed grouting device, the denitrification bacteria can breed and grow and generate the nitrogen and the carbon dioxide gas in the process, the nitrogen can replace water in the soil layer to form a bubble layer, penetrability of the soil layer is reduced, an appropriate amount of carbon dioxide gas and a slurry layer are subjected to carbonization reaction, slurry gaps are filled with calcium carbonate serving as a reaction product to a certain degree, and the strength and penetration resistance of slurry are enhanced. Double-layer active defense barriers for pollution and erosion water are formed, so that penetration of pollutants and saline solution to a tunnel structure is reduced, and active corrosion resistance and erosion resistance of the tunnel structure are improved.
Description
technical field [0001] The invention relates to a grouting method for improving the corrosion resistance and erosion performance of soft soil shield tunnels by injecting microbial bacteria into the grouting layer behind the tunnel lining wall and the soil layer interface. Background technique [0002] With the rapid development of urbanization in our country and the adjustment of the layout of industrial factories, more and more polluting industries have moved out of the city, and the wastewater generated by these enterprises has entered the soil, causing pollution of the foundation soil. The groundwater level is relatively shallow, and some enterprises illegally discharge sewage, which will further aggravate the spread of pollution after the wastewater enters the water body. After acid rain enters the groundwater body, it will also make the water body more acidic. The intrusion of ground chlorine deicing salt and seawater will increase the content of chloride ions in the so...
Claims
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