Method for determining influence of waterproof curtain leakage below foundation pit excavation surface on surroundings

Abstract

The invention provides a method for determining the influence of a waterproof curtain leakage below a foundation pit excavation surface on surroundings. The method comprises the steps that on the basis of scene investigation and foundation pit information collection, the ultrasonic imaging CT technology is adopted for determining the position of the waterproof curtain leakage and the area of the leakage, and a measured value of well water level observation and other data are obtained through a foundation pit water pumping test; a three-dimensional fluid-solid coupled model is built, a leakage unit is arranged at the position of the waterproof curtain leakage according to the area of the leakage, the water pumping test is simulated, analysis model calculation is performed, and finally a calculated value of the well water level observation is obtained; according to the fitting condition of the measured value and the calculated value, permeability coefficients at the position of the waterproof curtain leakage are determined; and the permeability coefficients at the position of the leakage are input to the leakage unit, leakage consolidation simulation is performed, and finally the underground water level and ground subsidence amount of a foundation fit are determined. The method is simple and convenient to popularize, has the great application value and is applicable to solving the problem of the waterproof curtain leakage below the foundation pit excavation surface.

Description

technical field [0001] The invention relates to a method in the technical field of construction engineering, in particular to a method for determining the influence of leakage of a water-stop curtain below the excavation surface of a foundation pit on the surrounding environment. Background technique [0002] With the continuous development of underground space, more and more foundation pit projects have emerged. At present, it is more and more common for foundation pit projects to excavate to a depth of 20-30m. To solve the problem of foundation pit dewatering, well point dewatering is widely used today. Combined with the water-stop curtain to reduce the groundwater level in the foundation pit. Among them, the water-stop curtain is the general name of the water-stop series around the main body of the project. It is used to prevent or reduce the side wall of the foundation pit and the groundwater at the bottom of the foundation pit from flowing into the foundation pit. Deep...

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Problems solved by technology

[0003] After searching the existing technical literature, it is found that the research on the leakage of the water-stop curtain mainly focuses on the impact of leakage on the groundwater level, and has not considered the impact of the leakage of the water-stop curtain on the surrounding environment, and the current analysis method It is a two-dimensional finite element method. For example, in "Hydraulic characterization of diaphragm walls for cut and cover tunneling" published by Pujades in "Engineering Geology" in 2012, the two-dimensional finite element method was used to draw the relationship between the water level drawdown derivative and time under different seepage conditions, and proposed some Analytical calculation formula, through the combination of the two can calculate the leakage coefficient of the water-stop curtain, its disadvantage is that it is only applicable to the strip foundation under certain conditions

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