Study on Replacement of Fluidized Solidified Soil with Sand Protective Cushion on Vacuum Combined Surcharge Preloading Membranes

doi:10.12068/j.issn.1005-3026.2024.10.016

Abstract

Abstract:

The sand protective cushion is required in vacuum combined surcharge proloading foundation treatment project and the sand source is abnormally tight in many areas. The research on using mucky fluidized solidified soil to replace protective cushion on vacuum combined surcharge preloading membranes is carried out. Numerous tests on unconfined compressive strength test and fluidity test are conducted to investigate the effects of parameters such as water content， solidifying agent dosage， and admixture dosing on the fluidity and strength of the preparation of fluidized solidified soil. The results show that increasing the water content of mucky residue or adding admixture can effectively improve the fluidity， and the admixture is more significant. The amount of solidifying agent is the most crucial factor to influence the strength， and increasing the admixture will reduce the strength. In addition， for the mucky residue with the water content of 120%~140%， there is no need for admixture. When the amount of solidifying agent is 5%~7% of the mass of the mucky residue， it can replace the sand cushion； for the mucky residue with the water content of 80%~100%， adding certain admixture based on 5%~7% solidifying agent can also meet the requirements of the protective cushion.

Key words: fluidized solidified soil, response surface methodology, mucky residue, water reducer, fluidity, sand protective cushion

CLC Number:

TU 44

Ya-jun WU, Hai-qiang ZHANG, Jia-cheng ZHAN, Jia-cheng LUO. Study on Replacement of Fluidized Solidified Soil with Sand Protective Cushion on Vacuum Combined Surcharge Preloading Membranes[J]. Journal of Northeastern University(Natural Science), 2024, 45(10): 1494-1503.

Figures/Tables 8

Fig.1 Flow diagram of experiment

Table 1 Basic physical properties of mucky residue

含水率	液限	塑限	塑性指数	密度	有机质质量分数
%	%	%	塑性指数	g·cm^-3	%
64.3	42.5	20.9	21.6	1.62	3.2

Fig.2 Variation curves of fluidity of non?admixture mucky residue

Fig.3 Fluidity variation curves of mucky residue conditioned with admixture

Fig.4 Scanning electron micrographs of the mucky residue before and after treatment with solidifying agent and admixture

Fig.5 Strength variation curves of non?admixture mucky residue

Fig.6 Strength variation curves of WR-conditioned mucky residue

Fig.7 Scanning electron micrograph of the solidifying agent and admixture conditioned mucky residue curing for 7 days

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