Method for designing grooving construction slurry parameters for underground diaphragm wall of water-rich sand gravel stratum based on overall stability of groove wall

Abstract

The invention discloses a method for designing grooving construction slurry parameters for an underground diaphragm wall of a water-rich sand gravel stratum based on the overall stability of a groove wall. The method is characterized by comprising the following steps: firstly, establishing an overall instability model for the groove wall of the underground diaphragm wall of the water-rich sand gravel stratum according to geological and hydrological conditions of engineering practice, and calculating the sliding-down force and the sliding resistance force of a sliding body; secondly, calculating based on a limit equilibrium theory to obtain minimum slurry gravity capable of guaranteeing the overall stability of the groove wall of the underground diaphragm wall of the water-rich sand gravel stratum. According to the method, the geological and hydrological characteristics of the water-rich sand gravel stratum are taken into consideration, particularly the influence on the stability of the groove wall caused by loads of a building around a foundation pit is taken into consideration; an established analysis model more approaches the engineering practice, a calculation result is more reliable, and the grooving construction slurry parameters for the underground diaphragm wall of the water-rich sand gravel stratum under complicated surrounding conditions can be quantitatively designed.

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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