Foundation
PAN Jiqiang, RUAN Yongfen, LIU Kewen, CAI Long, GUO Yuhang
2023, 39(3): 158-164.
The soft soils deposited in the lake phase of Dianchi basin have a wide distribution of deep peaty soils, which are characterized by high compressibility, low strength and high creep, and accidents are frequent in the construction of such sites. We collect cases of deep foundation pits, pile foundations and foundations on such sites, study and analyze the causes of accidents, disaster effects, management measures and effects, and explore the control and preventive measures of accidental disaster effects. The analysis results show that： the excavation should follow the principles of blocking, segmentation, stratification, balance and timing; creep of such soft soil is large, the support structure inside the pit should have sufficient stiffness, support should be readybecard excavation, and the exposure time of the critical surface should not be long; creep of soft soil will cause insufficient anchor and tilt deformation of the support pile; the internal support should control the deformation of the column pile to prevent the deformation when the soil is too soft, causing the destruction of the internal support structure; the range and height of the pile load around the site, should be controlled properly,otherwise deep slippage may occur. This research can provide reference for the engineering design and construction on such sites.
