Method for improving bearing capacity of pile foundation under construction by replacing and filling soil between piles

Abstract

The invention discloses a method for improving the bearing capacity of a pile foundation under construction by replacing and filling soil between piles. The method comprises the following steps: step1, all the soil between the piles is dug out to a calculated depth of 1.0 m to 3.0 m; and step 2, when an excavation face is located above the underground water level, lime soil in the ratio of 2:8 orlime soil in the ratio of 3:7 is used for layered tamping, and the compaction coefficient Lambda c is larger than or equal to 0.95; when the excavated face is located below the underground water level, sand and stone materials are used for tamping layer by layer, and the compaction coefficient Lambda c is appropriate to be larger than or equal to 0.97. By adopting the method of replacing and filling the soil between the piles, the frictional resistance of the upper part of the pile foundation (or the rigid pile composite foundation) is greatly improved the requirement for the bearing capacityof the originally designed pile foundation is met, the mechanical property of shallow foundation soil can be improved, the mechanical defects such as collapsibility and expansibility of the shallow foundation soil are eliminated, the manufacturing cost is low, the construction period is short, and compared with a traditional pile supplementing construction method, the method is a better method for improving the bearing capacity of the pile foundation (or the rigid pile composite foundation).

Description

technical field [0001] The invention relates to the field of construction methods, in particular to a method for improving the bearing capacity of pile foundations under construction by replacing and filling the soil between piles. Background technique [0002] Pile foundation is a deep foundation that connects the tops of several piles into a whole through caps to bear dynamic and static loads together. Pile is a vertical or inclined foundation component set in the soil, and its function is to pass through the weak high compression The soil layer or water transfers the load borne by the pile to the harder, denser or less compressible foundation bearing layer. We usually refer to the piles in the pile foundation as foundation piles. Composite foundation means that part of the soil of the natural foundation is strengthened or replaced during the foundation treatment process, or reinforcement materials are set in the natural foundation, and the reinforcement area is composed o...

AI Technical Summary

Problems solved by technology

The method of supplementing the piles is expensive and has a long construction period, especially when the originally designed pile spacing is relatively small, it is difficult to achieve the purpose of the method of supplementing the piles