Basalt fiber reinforced cement soil mixing pile and construction method thereof

Abstract

The invention relates to a basalt fiber reinforced cement soil mixing pile and a construction method of the basalt fiber reinforced cement soil mixing pile. A mixed slurry material for the cement soil mixing pile comprises, by mass, 0.4 part of basalt fiber, 15 parts of cement, 7.5 parts of water and 0.02 part of muddy soil. The reinforced mixing pile forming process includes the steps that firstly, the basalt fiber and the on-site muddy soil are mixed in a dry-mixing manner through a drum mixer according to the mass ratio of 20 to 1; after uniform mixing is conducted, cement paste with the water cement ratio being 0.5 is added and mixed through the drum mixer, and basalt fiber cement soil mixed slurry is formed; and finally the mixed slurry is poured into a deep mixer material collection hopper, and then mixing pile construction is conducted according to the normal deep mixing pile construction process. The tensile strength and the shear strength of the reinforced cement soil material are improved greatly, so that the horizontal stiffness and horizontal bearing capacity of the cement soil mixing pile are improved, and the novel mixing pile has seepage resistance, the water stop function, horizontal bearing capacity and deformation resistance.

Description

technical field [0001] The invention relates to a basalt fiber reinforced cement-soil mixing pile and a construction method thereof. The invention belongs to the technical field of geotechnical engineering foundation pit support. It is suitable for the enclosure structure of foundation pit engineering with shallow buried water table, especially in geological conditions such as muddy soil layer with high water content. Background technique [0002] Cement-soil mixing piles have flexible reinforcement forms, small construction disturbance and low cost, and are widely used in engineering construction. The main application forms are soft foundation reinforcement and water-stop curtains. Compared with the vertical bearing capacity of the cement-soil mixing pile, the tensile and shear strength of the cement-soil is low, and its horizontal bearing capacity is relatively weak. When used as a retaining structure for foundation pit engineering, it is mainly used as a water-stop curt...

AI Technical Summary

Problems solved by technology

[0003] In the construction process of reinforcing and mixing piles, the effect of mixing basalt fibers directly with cement slurry under conventional conditions is not ideal. The mixed slurry of basalt fiber and cement slurry is directly pumped to the deep mixer for pile construction. The precipitated flaky basalt fiber is easy to concentrate on some pile joints of the cement-soil mixing pile body, and the stirring effect of the mixer cannot fully disperse the basalt fiber evenly. In the mixing pile; and the precipitated and concentrated basalt fiber can easily block the slurry outlet of the mixer, resulting in the failure of normal construction work