Foundation pit side slope sandy soil drainage method

Abstract

The invention relates to foundation construction field, in particular to a sand soil drainage method for foundation pit side slope. The foundation pit side slope sandy soil drainage method includes that: step 1, filter pipe fabrication; step 2, water filter pipe embedment; the foundation pit is excavated to the scale height of the sand layer, and the filter pipe fabricated in step 1 is embedded in the sandy interlayer of the side slope and is communicated with a vacuum pump; step 3, the vacuum pump is started: the pump operates to drain water; step 4, the lower soil is continuously excavated. The invention can utilize vacuum negative pressure principle to enable the vacuum dewatering filter head to be transversely laid in the quicksand layer for quickly absorbing the effluent water of the sandy interlayer, is convenient, simple and quick in treating quicksand, and has high construction efficiency.

Description

technical field [0001] The invention relates to the field of foundation construction, in particular to a soil layer drainage method for foundation pit slopes. Background technique [0002] Many coastal areas in our country have reclaimed land from the sea, transforming the tidal flats between the land and the sea into land that can be used by industry and agriculture. Among them, in road construction, it is necessary to arrange rainwater drainage pipes underground. Usually, under the road surface in such areas are backfilled muck layer, sand layer and silty clay layer in sequence. The burial depth of the rainwater drainage pipe is exactly in the sand layer. Because the sand layer is rich in water and has seepage fluidity, after the excavation of the slope, the water in the sand layer will form quicksand and cause slope instability. For this reason, people adopt wooden piles to fix on the edge of the foundation pit and use sand bags to absorb the water discharged from the s...

AI Technical Summary

Problems solved by technology

The burial depth of the rainwater drainage pipe is exactly in the sand layer. Because the sand layer is rich in water and has seepage fluidity, after the excavation of the slope, the water in the sand layer will form quicksand and cause slope instability.

For this reason, people use wooden piles to fix the foundation pit and use sand bags to absorb the water discharged from the sand layer. This method not only has poor drainage effect, but also prolongs the construction period and is costly.