Slurry permeation range calculation method in tunnel shallow-buried section high-pressure jet grouting pile method reinforcement

Abstract

The invention discloses a slurry permeation range calculation method in surface reinforcement of a shallow-buried section of a tunnel by a high-pressure jet grouting pile method. The method comprises the following steps: establishing a one-way permeation range calculation model of slurry in a rock-soil body around a pile and determining key parameters of the model; the model established in the previous step is substituted into cylindrical penetration, and construction of a high-pressure jet grouting pile slurry penetration filling range plane analysis model is completed; and according to the high-pressure jet grouting pile slurry permeation filling range plane analysis model, the high-pressure jet grouting pile slurry permeation range is calculated. By means of the method, the slurry permeation range, the permeation coefficient reduction amplitude and the strength improvement amplitude of tunnel shallow-buried weak surrounding rock high-pressure jet grouting pile method earth surface reinforcement can be calculated, and the method has the advantages of being simple, easy to operate and the like in actual engineering application; important reference bases are provided for design of the pile distance and the pile size and evaluation of the permeation effect and the reinforcing effect in the high-pressure jet grouting pile reinforcing project, material waste is effectively reduced, and cost is greatly saved.

Description

technical field [0001] The invention relates to the technical field of tunnel engineering and high-pressure rotary grouting pile method reinforcement engineering, in particular to a calculation method for grout penetration range in the surface reinforcement of high-pressure rotary grouting pile method in a shallow buried section of a tunnel. Background technique [0002] Traditionally, in-cave reinforcement and surface reinforcement methods are often used for the reinforcement of the surrounding rock in the shallow buried section of the tunnel. The in-cave reinforcement method is to reinforce the surrounding rock within a certain range in front of the tunnel. However, for the pre-support method of in-cave reinforcement, Not only is the construction difficulty increased and the construction progress slowed down due to the limitation of the site in the tunnel, but the reinforcement effect is also difficult to guarantee; compared with the reinforcement method in the tunnel, the ...

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Problems solved by technology

[0006] In order to solve the problems existing in the prior art, there are few studies on the grout seepage and filling effect in the reinforcement method of high-pressure jet grouting piles on the surface of the shallow buried soft surrounding rock, the specific seepage filling range of the grout is difficult to determine, and the reinforcement effect of the grout seepage filling area cannot be quantified. Analysis and other issues, the present invention provides a calculation method for the grout penetration range in the surface reinforcement of the shallow buried section of the tunnel with high-pressure jet grouting pile method, which considers the rock and soil properties, the fluid mechanics characteristics of the grout, the grout penetration path and other factors, not only can calculate The penetration range of the grout in the high-pressure grout extrusion permeation area can also be calculated at the same time as the ratio of the increase in the strength of the rock and soil mass to the decrease in permeability within the permeation range, which solves the problems mentioned in the above-mentioned background technology

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