Construction method of composite foundation with bagged compacting and slurry cementing small-diameter gravel pile

Abstract

The invention relates to a construction method of composite foundation with a bagged compacting and slurry cementing small-diameter gravel pile for treating a small-area soft deep mollisol layer. The method is characterized in that a small-diameter soil engineering pipe bag is combined with a traditional gravel pile treatment method, and the compacting effect of the gravel pile and the restraint effect of the soil engineering pipe bag are utilized to form a high-density micro pile group effect so as to improve the bearing capacity of the foundation. The method has the advantages that the bagged compacting and slurry cementing small-diameter gravel pile can obviously improve the engineering properties of shallow foundation soil, effectively improve the strength of the foundation soil, decrease the settlement after work and is an effective method for treating a small-site mollisol foundation. Due to the limit restraint effect and the packaging effect of the soil engineering pipe bag, the dosage of gravels is greatly reduced, and the slurry cementing effect of cement slurry guarantees the pile body strength. Compared with a gravel pile method of a large-area mollisol foundation, the method has the characteristics of simple process, quick construction, miniaturization of construction equipment, material saving and low manufacture cost and can be generalized and applied to treatment engineering of the small-site deep mollisol foundation.

Description

Technical field [0001] The invention relates to a treatment method for a shallow composite foundation, in particular to a construction method for a bagged compacted slurry-solidified small-diameter gravel pile composite foundation for treating weak, deep and thick soft soil layers, and belongs to the technical field of geotechnical engineering. Background technique [0002] Due to the soft soil foundation has high natural water content, large void ratio, high compressibility, low shear strength, small consolidation coefficient, long consolidation time, poor water permeability, complex layered distribution of soil layers, and physical and mechanical properties between layers. Due to the characteristics of large differences, the bearing capacity of soft soil foundations is generally very low, and the overall stability is poor. Therefore, when using such weak foundations, appropriate foundation treatment methods must be adopted in engineering. At present, the most important tre...

AI Technical Summary

Problems solved by technology

According to the characteristics of the soft soil foundation in small sites, the large-scale soft foundation treatment method cannot fully meet the requirements, the pile body is too deep into the soil (generally penetrates the soft soil layer), the pile diameter is large (600-1000mm), and large-scale construction machinery is heavy to enter the site Difficult, complex construction process, relatively high cost

Therefore, for the composite foundation reinforcement treatment of soft soil foundation in small sites, this kind of construction method has certain disadvantages