A kind of environment-friendly loess foundation anti-liquefaction improved loess and preparation method thereof

Abstract

The invention discloses novel environment-friendly loess foundation anti-liquefaction improved loess and a preparation method thereof. The improved loess is prepared according to the following mass proportion: 25 percent of pulverized fuel ash, 2 percent of lignin and 73 percent of loess, wherein the loess is subjected to fine rolling and sieving; the total sum of the content of SiO2, Al2O3 and CaO in the pulverized fuel ash is not lower than 75 percent; the ignition loss is not greater than 10 percent. The preparation method of the improved loess comprises the following steps that (1) the pulverized fuel ash, the lignin and the loess are subjected to dry mixing according to the mass proportion in the claim 1; (2) after the uniform mixing, the improved soil material and the water are uniformly mixed according to the mass ratio of water to mixed soil of 1:6.5; (3) the maximum dry density is determined according to the indoor compaction test; the compaction degree is controlled to be 0.93; (4) after the compaction is completed, the curing is not smaller than 28 days; the improved loss preparation is completed. Waste pulverized fuel ash of a coal-fired power plant and paper mill blackliquid extract lignin are used as improvement materials of loess foundation anti-liquefaction treatment; the foundation treatment cost is greatly reduced; meanwhile, higher environmental protection benefits are realized.

Description

technical field [0001] The invention relates to an environment-friendly loess foundation anti-liquefaction improved loess and a preparation method thereof, belonging to the technical field of rock and soil mechanics. Background technique [0002] Loess is a Quaternary sediment with special properties. Its special structure determines that it has strong dynamic catastrophic characteristics and shows extremely high dynamic vulnerability. At the same time, loess has strong water sensitivity, that is, the salts that produce intergranular cementation in loess are easily soluble or soluble in water, making loess soften when it is saturated with water, that is, the shear strength decreases and it is in a metastable state Under earthquake action, the pore water pressure rises and the effective stress decreases, resulting in liquefaction disasters, which are manifested macroscopically as land subsidence in flat areas and low-angle long-distance slip in hilly areas. Indoor experiment...

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Problems solved by technology

Lignin as an improved material for soil reinforcement is mostly focused on improving silt and low plasticity clay, and there are only research results on statics. There are few studies on the engineering properties of lignin-improved loess. The dynamic characteristics of lignin-improved loess and seismic stability studies are relatively rare

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