A kind of retaining wall mud for underground diaphragm wall of deep and large foundation pit in round gravel formation and its configuration method

Abstract

The invention relates to the field of building construction, and provides a mud for retaining wall of an underground diaphragm wall of a deep and large foundation pit in a round boulder formation, which comprises the following raw materials in parts by weight: 1000 parts of water, 75-85 parts of bentonite, 3-5 parts of soda ash, and polyacrylic acid Sodium 0.5‑1.5 parts. The invention also provides a method for configuring the slurry for the retaining wall of the underground diaphragm wall of the deep and large foundation pit in the round gravel formation. The advantage of the present invention is that: the present invention adopts sodium polyacrylate to replace traditional CMC, and its slurry retaining wall performance and slurry recycling rate will be greatly improved, and at the same time, corresponding environmental pollution and material consumption are reduced; at the same time, it is prepared according to the formula of the present invention The various indexes of the obtained mud can meet the requirements of the circulating mud index, the effect of wall protection is good, and the stability of the groove wall is good.

Description

technical field [0001] The invention relates to the field of building construction, in particular to an underground diaphragm wall retaining mud for deep and large foundation pits in round gravel formations and a configuration method thereof. Background technique [0002] The underground diaphragm wall has the advantages of mature technology, high rigidity, good integrity, and good water-stop effect. In recent years, it has become a widely used form of enclosure structure in the construction of various foundation pits. During the trench construction of the underground diaphragm wall, the retaining mud will be deposited on the surface of the trench wall to form a mud skin, so that the trench wall is protected. At the same time, the water and soil pressure of the mud and soil layer in the tank is balanced, and the tank wall remains stable and does not collapse. [0003] For the underground diaphragm wall of deep and large foundation pits, due to the large depth of the grooves...

AI Technical Summary

Problems solved by technology

[0004] At present, most of the traditional muds that are widely used use CMC (sodium carboxymethyl cellulose) as a thickener. The index of this kind of traditional mud is far from meeting the requirements of the retaining wall of "deep and large foundation pit underground diaphragm wall". Shrinkage cavity or local collapse of the tank wall is prone to occur, and common quality problems such as mud and sand inclusions at the wall joints are prone to water leakage

In addition, in the poor self-stability and strong water permeability such as round gravel formations, the stability of the specific gravity, PH value, viscosity and other indicators of traditional mud are also easily affected by groundwater. During the construction of the trough, the stability of the trough wall will not be effectively guaranteed

At the same time, traditional mud also has the problem of high waste slurry rate, which is not conducive to environmental protection

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