Sand gravel stratum deep foundation pit excavation supporting slurry method

Abstract

The invention discloses a sand gravel stratum deep foundation pit excavation supporting slurry method which comprises the following steps that S1, a beach land where an inverted siphon is located is leveled, and an inverted siphon foundation sand gravel drilling grouting operation platform is formed; s2, a cofferdam is filled in the position, close to the river shoal, of one side of the inverted siphon foundation sand gravel drilling and grouting operation platform in the S1, and water of the Yellow River is prevented from entering the operation face during drilling and grouting operation; s3, an excavation contour line is marked on the inverted siphon excavation cross-section diagram, the portion below the excavation contour line is a consolidation grouting range, and then the drilling grouting depth of each grouting hole is calculated; s4, drawing a grouting hole position map of the inverted siphon foundation sand gravel grouting drill hole, and marking the plane position of each grouting hole and the grouting depth of the drill hole, and S5, according to the plane position of each grouting hole and the grouting depth of the drill hole in the S4, performing drilling grouting operation, and forming a protective layer through grouting. The method has the advantages of simple steps and high practicability.

Description

technical field [0001] The invention relates to the technical field of building construction, in particular to a method for excavating a supporting slurry for deep foundation pits in sand and gravel strata. Background technique [0002] In the process of deep foundation pit excavation in sand and gravel stratum, the traditional method has the following problems: 1. After the excavation of the sand and gravel stratum with strong water permeability, the slope is piped due to leakage, which causes the seepage water to carry fine particles in the sand and gravel stratum from the side. After the slope flows out, the slope collapses and affects the safety and stability of the deep foundation pit slope. 2. After the excavation of the sand and gravel highly permeable stratum, the inverted siphon foundation surface will produce piping phenomenon due to leakage, causing the seepage water to carry fine particles in the sand and gravel stratum out of the foundation surface, resulting in...

AI Technical Summary

Problems solved by technology

[0002] The following problems exist in the traditional method during the excavation of deep foundation pits in sandy gravel formations: 1. After the excavation of sandy gravel strong water-permeable formations, the slope will cause piping due to leakage, causing the seepage water to carry fine particles in the sandy gravel formations from the edge. After the slope flows out, the slope collapses and affects the safety and stability of the deep foundation pit slope

2. After the excavation of the sand and gravel strong water-permeable stratum, the inverted siphon foundation surface will cause piping due to leakage, causing the seepage water to carry the fine particles in the sand and gravel stratum to flow out of the foundation surface and cause the lower part of the foundation surface to be overhead, resulting in The adjacent segments of the inverted siphon produce uneven settlement, which affects the safe operation of the inverted siphon