A filling material and preparation method for controlling karst ground subsidence

Abstract

The invention discloses a filling material for treating karst ground collapse and a preparation method of the filling material. The filling material mainly comprises an organic excitation cementing material and a structural foam material, wherein the organic excitation cementing material consists of an inorganic mixed material, polystyrene and phthalic anhydride according to a weight ratio of 1:(1.5-3.5):(2.8-4.9), and the inorganic mixed material consists of zeolite, gypsum and sodium sulfate according to a weight ratio of 1:1:1; the structural foam material consists of urea formaldehyde and polyurethane according to a weight ratio of 1:(2.3-3.5); and the weight ratio of the organic excitation cementing material to the structural foam material is 1:(2.5-3.8). The filling material disclosed by the invention is simple in composition, is environmental friendly and pollution-free, and has good mechanical performance, water permeability and cementing strength.

Description

technical field [0001] The invention relates to a filling material and a preparation method for controlling karst ground subsidence, belonging to the technical field of geological disaster control engineering. Background technique [0002] At present, the problem of geological disasters caused by karst ground subsidence in our country is quite serious. Thousands of karst ground subsidence geological disasters occur in the country every year, causing economic losses of up to billions of yuan. The severely affected areas are mainly distributed in Guangxi, Yunnan, Guizhou and other places. The occurrence of karst ground subsidence geological disasters not only causes damage to structures such as buildings and roads, affects normal production and operation, but also threatens the lives of people, endangers the ecological environment, and causes huge economic losses. [0003] Traditional karst ground subsidence geological disaster control methods usually use replacement, grouti...

AI Technical Summary

Problems solved by technology

A.R.Brough et al (Sodiumsilicate-based, alkali-activated slagmortarsPart1[J].Strength,hydrationandmicrostrureCementandConcreteResearch, 2002,32:865-879.) activated granulated blast furnace slag by sodium silicate, and added NaCl to adjust the coagulation time, found that in After NaCl is added, there is quick-setting effect, but the cementing ability with rock and soil is poor

Taylor et al. (CementChemistry[M], Academeic, London, 1990.) used fly ash as the basic raw material and K-type alkali as the activator to prepare the filling material. Its strength and stability are good, but in the cemented body The C-S-H gel structure has poor water permeability, and it is easy to change the runoff mode of groundwater, causing the cave to expand in a new direction, causing secondary disasters

In addition, the traditional cement mortar filling material is not easy to cement under the condition of high underground water, and its workability and stability are poor. The filling slurry is prone to segregation and pipe plugging during the preparation and transportation process. During the cementation process of the body, the phenomenon of "mud without cementation" will occur, so that the treatment effect cannot be effectively guaranteed

[0005] To sum up, traditional karst land subsidence geological disaster control methods and filling materials have many disadvantages, such as high cost, damage to groundwater runoff, poor bonding ability between filling and soil, easy loss, and large disturbance to the geological environment. Good for promotion and application

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