A soil pre-reinforcement method for grooved construction of an underground diaphragm wall in a thick silt layer

Abstract

The invention provides a soil mass pre-reinforcement method for trench construction of an underground diaphragm wall in a thick mud layer. The soil mass pre-reinforcement method for trench construction of the underground diaphragm wall in the thick mud layer comprises the following steps: (1) geologically examining a construction site and determining soil layer division information; (2) determining a thick mud layer reinforcement method, namely reinforcing mud soil in an isolating manner by combination of cement mixing piles and CFG piles; (3) determining minimum reinforcement widths of two sides of a trench wall of the underground diaphragm wall; and (4) reinforcing thick mud on two sides of the trench wall of the underground diaphragm wall by using the cement mixing piles and the CFG piles. The minimum reinforcement widths of the thick mud on the two sides of the trench wall of the underground diaphragm wall are calculated to guarantee stability of the trench wall during trench construction; and the thick mud soil is reinforced by the combination of the cement mixing piles and the CFG piles, shortcomings that construction period is long, cost is high, and even reinforcement cannot be implemented in the prior art are overcome, and therefore, efficient reinforcement construction of the thick mud soil is realized.

Description

technical field [0001] The invention relates to a construction method in the technical field of underground construction engineering, in particular to a soil pre-reinforcement method for trench construction of an underground diaphragm wall in a thick mud layer. Background technique [0002] Major cities across the country are building urban underground railways and various underground spaces on a large scale. These underground space structures need to be constructed by excavating foundation pits, and underground diaphragm walls are required as temporary structures for retaining soil and water during excavation of foundation pits. Due to the different geological conditions and surrounding environments of each city, it is necessary to build underground diaphragm walls under various geological conditions. The construction technology of underground diaphragm wall has been widely used in my country's natural sedimentary sandy soil, cohesive soil and other soft soil strata. But ...

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Problems solved by technology

[0004] Aiming at the defects in the prior art, the purpose of the present invention is to provide a soil pre-reinforcement method for underground diaphragm wall trough construction in a thick silt layer, by calculating the minimum reinforcement width of thick silt on both sides of the underground diaphragm wall trough wall to ensure The stability of the tank wall during tank construction; the combination of cement mixing piles and CFG piles is used to reinforce thick silt soil, which overcomes the shortcomings and shortcomings of long construction period, high cost and even inability to reinforce in the prior art, and realizes Efficient Consolidation Construction of Thick Silt Soil

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