Design method of mud parameters for trenching construction of underground diaphragm wall in water-rich sand egg formation based on the overall stability of the trench wall

Abstract

The invention discloses a method for designing mud parameters for trenching construction of an underground diaphragm wall in a water-rich sand egg stratum based on the overall instability of the trench wall. The overall instability model of the underground diaphragm wall groove wall in the sand egg formation, and calculate the sliding force and anti-sliding force of the sliding body; then, based on the limit equilibrium theory, calculate the minimum mud to ensure the overall stability of the underground diaphragm wall groove wall in the water-rich sand egg layer severe. The invention considers the geological and hydrological characteristics of the water-rich sand egg formation, especially the influence of the building load around the foundation pit on the stability of the trench wall, the established analysis model is closer to the actual engineering, and the calculation results are more reliable , the quantitative design of the mud parameters for trenching construction of the underground diaphragm wall in the water-rich sand egg stratum under complex surrounding conditions has been realized.

Description

technical field [0001] The invention belongs to the field of underground engineering, and in particular relates to a mud parameter design method for trenching construction of an underground diaphragm wall in a water-rich sand egg stratum. Background technique [0002] With the vigorous development of urban subway construction, the underground diaphragm wall has been widely used and has become an important means of foundation pit enclosure. The construction of underground diaphragm wall is mainly to excavate a narrow and long deep groove under the condition of mud retaining wall by using the groove forming machine. After the excavation is completed, a unit section is formed, and then the prepared steel cage is inserted, and the concrete is poured by the conduit method to complete a unit. The groove sections are connected by specific interface to form a wall-type underground continuous wall. In order to prevent the water inrush and collapse of the underground diaphragm wall i...

AI Technical Summary

Problems solved by technology

However, at present, the design of mud parameters at home and abroad is mainly carried out on the basis of experience and according to the engineering analogy method. As to whether the mud parameters used can fully meet the needs of safe construction of the underground diaphragm wall, or whether they are too conservative, engineers themselves can't be sure

Generally speaking, the design of mud parameters for trenching construction of underground diaphragm walls is still in the empirical stage, which cannot meet the needs of the rapid development of diaphragm wall construction in my country.

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