Fully-weathered sandstone high slope excavation construction method

Abstract

The invention discloses a fully-weathered sandstone high slope excavation construction method. The fully-weathered sandstone high slope excavation construction method comprises the following steps ofstep I, excavating a french drain and a water collecting well, arranging hollow anchor pipes, and pumping water by adopting a water pump until the horizontal line of underground water reaches a presetconstruction elevation; step II, performing segmented construction in the longitudinal direction, arranging two groups of high-pressure jet grouting piles, namely a group of inner high-pressure jet grouting piles and a group of outer high-pressure jet grouting piles, arranging concrete top beams at the tops of the high-pressure jet grouting piles, and enabling one high-pressure jet grouting pilein the inner row to be in reinforced connection with the two adjacent high-pressure jet grouting piles in the outer row through a plurality of steel bars; step III, digging out earth till the construction depth of the foundation pit is reached; step IV, arranging a first steel-concrete layer, a waterproof agent layer and a rubber layer along the side wall of the foundation pit; step V, arranging arubber asphalt layer and a second steel-concrete layer according to the preset slope inclination angle, and pre-burying a plurality of hollow anchor pipes; and step VI, repeating step I to step V until the depth of the foundation pit reaches the preset elevation. The method has the beneficial effects that the water stopping effect in the foundation pit excavation process of a whole sandstone layer is outstanding, and supporting is safe and reliable.

Description

technical field [0001] The invention relates to the technical field of deep foundation pit construction. More specifically, the invention relates to an excavation construction method for a fully weathered sandstone high slope. Background technique [0002] With the rapid development of the construction industry, the excavation depth of foundation pits is getting deeper and deeper, and the geological conditions are becoming more and more complex. Therefore, there are various construction problems in the excavation of deep foundation pits under various geological environments. The fully weathered sandstone layer is especially problematic, because the fully weathered sandstone layer has a lot of fissure water and no pressure, and after the fully weathered sandstone layer is excavated, the fissure water seeps quickly, has a large amount of water, and its distribution is uncertain and irregular. After exposure, the slope softens and corrodes seriously, making it difficult to exc...

AI Technical Summary

Problems solved by technology

The fully weathered sandstone layer is especially problematic, because the fully weathered sandstone layer has a lot of fissure water and no pressure, and after the fully weathered sandstone layer is excavated, the fissure water seeps quickly, has a large amount of water, and its distribution is uncertain and irregular. After exposure, the slope softens and corrodes seriously, making it difficult to excavate the foundation pit

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