A testing apparatus and a method for measuring a diffusion radius for binary-slurry grouting

Abstract

The invention discloses a testing apparatus for measuring a diffusion radius for binary-slurry grouting. The testing apparatus comprises a sandy soil system and a grouting system. The sandy soil system comprises a water storing container and a sealed sandy soil container. The bottom of the sandy soil container is communicated with the water storing container. The sandy soil container contains a compacted sandy soil test sample. The grouting system comprises a pneumatic supply and a sealed slurry storing container. The slurry storing container contains a binary slurry. The pneumatic supply is communicated with the top of the slurry storing container. The bottom of the slurry storing container is communicated with a grouting pipe. The lower end of the grouting pipe penetrates through a top cover of the sandy soil container and is inserted vertically into the sandy soil test sample. The part of the grouting pipe, which is inserted into the sandy soil test sample, is provided with grouting holes. A method for measuring the diffusion radius for binary-slurry grouting is also provided by the invention. The testing apparatus and the method stimulate a binary slurry grouting environment in engineering practice, measure the diffusion radius for binary-slurry grouting under different grouting pressures, provide theoretical references for diffusion radius determination of in engineering practice, and greatly reduce measurement errors of the grouting diffusion radius.

Description

technical field [0001] The invention relates to the technical field of double-liquid grouting performance testing equipment, in particular to a test device and method for measuring the diffusion radius of double-liquid grouting. technical background [0002] In deep foundation pit engineering, double-fluid grouting is often used to strengthen the sandy soil layer and form a water-cutting curtain. The diffusion radius of grout is an important parameter to evaluate the quality of grouting. In order to form a closed water-cutting curtain, the diffusion radius of grout must be greater than the distance between grouting holes, so as to ensure that the double-slurry effectively reinforces the piles to form an overlap. [0003] At present, the diffusion radius of slurry is usually determined by empirical formula or field test. However, the diffusion radius and influence range of the grout are closely related to the permeability coefficient of the formation and the grouting pressur...

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Problems solved by technology

However, the diffusion radius and influence range of the grout are closely related to the permeability coefficient of the formation and the grouting pressure. For different formations, there are large differences in gradation and permeability, and the range of grouting volume calculated by the empirical formula is too large. The amount of grouting is difficult to control, and the measurement error of the grouting range is large; the field test refers to gradually exploring the range of the grouting diffusion radius by setting probe holes around the grouting hole, and the grouting radius cannot be accurately obtained, and it is difficult to observe the grouting area intuitively. Pulp effect, and time-consuming, high cost

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