Calculation method of seepage inflow around hanging water-intercepting curtain

Abstract

The invention relates to the technical field of calculation of seepage inflow amount around hanging water-intercepting curtain, a method for calculating the amount of seepage flow around the hanging water cut-off curtain includes such steps as determining hw value, hd value and he value, wherein hw is the distance from the groundwater level line to the foundation pit bottom, hd is the length of the wat cut-off curtain bottom embedded in the foundation pit bottom, and he is the distance from the water cut-off curtain bottom to the top surface of bedrock; 2) obtaining the maximum hydraulic gradient value imax and the minimum hydraulic gradient value immin according to the influence radius R of the groundwater level descent and the equivalent radius ro of the foundation pit, and combining with the equivalent values of hw, hd and he; 3) according to the weight coefficient xi of the maximum hydraulic gradient and the weight coefficient 1 of the minimum hydraulic gradient; The average hydraulic gradient (img file = 'DDA000181065539000011. TIF' wi= '66' he= '74'/) 4) is obtained according to the seepage area A at the foundation pit bottom and the equivalent permeability coefficient keq, the water inflow quantity Q around the bottom of the water interception curtain into the foundation pit is obtained. The imax value and the imin value are corrected by the coefficient xi. The average hydraulic gradient (img file = 'DDA0001810655390000012. TIF' wi= '59' he= '73'/) is obtained by weighted averaging, which is simple in principle, convenient in use and high in precision.

Description

technical field [0001] The invention relates to the technical field of calculation of seepage inrush volume around a suspended water cut-off curtain, in particular to a calculation method for seepage inflow around a suspended water cut-off curtain. Background technique [0002] In the design and construction of the dewatering engineering of the foundation pit project, the water cut-off curtain is generally used to effectively control the groundwater to prevent the seepage damage or the collapse of the pit wall caused by the large amount of groundwater seeping into the foundation pit, and create a good operation for the excavation of the foundation pit and the construction of the foundation project. environment. [0003] When the aquifer is buried deep and thick, restricted by factors such as construction equipment, stratum conditions, and project cost, the water-cutting curtain cannot completely cut off the aquifer and embed it into the impermeable bedrock, and the bottom of...

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a method for calculating the water inflow around the suspended water cut-off curtain, aiming to solve the problem in the prior art that the calculated result of the water inflow in the foundation pit of the suspended water-cut curtain has a large deviation

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