Soil treatment

Abstract

A method of treatment of foundation soil beneath a structure, comprising treating the foundation soil with an ionic treatment agent, and treating the foundation soil with a soil stabiliser to stabilise the foundation soil.

1 . A method of treatment of foundation soil beneath a structure, comprising treating the foundation soil with an ionic treatment agent, and treating the foundation soil with a soil stabiliser to stabilise the foundation soil. 
     
     
         2 . A method as claimed in  claim 1 , wherein the soil stabiliser forms a solid or a gel in the foundation soil and thereby stabilises it. 
     
     
         3 . A method as claimed in  claim 1 , wherein the respective treatments are carried out sequentially. 
     
     
         4 . A method as claimed in  claim 3 , wherein the treatment with the ionic treatment agent is carried out before the treatment with the soil stabiliser. 
     
     
         5 . A method as claimed in  claim 3 , wherein the treatment with the soil stabiliser is carried out before the treatment with the ionic treatment agent. 
     
     
         6 . A method as claimed in  claim 1 , wherein the respective treatments are carried out simultaneously. 
     
     
         7 . A method as claimed in  claim 1 , wherein the respective treatments are carried out on the same portion of the foundation soil. 
     
     
         8 . A method as claimed in  claim 1 , wherein the treatment with the ionic treatment agent is carried out on a first portion of the foundation soil above a second portion of the foundation soil, and the treatment with the soil stabiliser is carried out on the second portion. 
     
     
         9 . A method as claimed in  claim 8 , wherein the soil stabiliser in the second portion expands to cause compression of the first portion. 
     
     
         10 . A method as claimed in  claim 8 , wherein the soil stabiliser is discharged into the second portion at a pressure which causes compression of the first portion. 
     
     
         11 . A method as claimed in  claim 1 , wherein the treatment with the ionic treatment agent is carried out on a first portion of the foundation soil below a second portion of the foundation soil, and the treatment with the soil stabiliser is carried out on the second portion. 
     
     
         12 . A method as claimed in  claim 1 , comprising injecting the ionic treatment agent into the foundation soil and injecting the soil stabiliser into the foundation soil. 
     
     
         13 . A method as claimed in  claim 12 , wherein tubes are used to inject the ionic treatment agent and the soil stabiliser into the foundation soil. 
     
     
         14 . A method as claimed in  claim 1 , wherein the treatment with the ionic treatment agent is carried out directly under a central region of a slab of the structure. 
     
     
         15 . A method as claimed in  claim 1 , further comprising treating soil around a perimeter of the structure with the ionic treatment agent. 
     
     
         16 . A method as claimed in  claim 1 , wherein the soil stabiliser comprises polyurethane. 
     
     
         17 . A method as claimed in  claim 1 , wherein the soil stabiliser comprises acrylic. 
     
     
         18 . A method as claimed in  claim 1 , wherein the soil stabiliser comprises silicate. 
     
     
         19 . A method as claimed in  claim 1 , wherein the soil stabiliser comprises a material which expands in the foundation soil. 
     
     
         20 . A method as claimed in  claim 1 , wherein the soil stabiliser fills at least some pore spaces in the foundation s