Abstract
Abstract Various types of trenchless methods are extensively used to create engineering barriers for the purpose of achieving relatively low hydraulic conductivity of the subsoil and hydrotechnical structures. The most commonly used technologies of the grouting curtain creating are the DSM (Deep Soil Mixing), WIPS (Vibro Injcted Thin Wall), low-pressure injection and jet-grouting. Vertical barriers are widely used in environmental control systems to restrict the lateral spreading of liquid or gaseous contaminants and for seepage control through and beneath a levees. The barrier walls are constructed in a single or two phases using a slurry composed mainly of bentonite, cementitious materials and water. Often to solve complex geotechnical problems the technologies are combined (e.g. combining DSM and jet grouting). In the paper some examples of practical application of chosen types of technology dedicated different problems solving are presented. The results of geotechnical investigations of hydraulic permeability, shear strength and depth control of cut-off wall are given. The tests were carried out using BAT system, Cone Penetration Tests (CPT) and drillings. The presented test results should help define the technical and financial criteria that should be used to compare grouting based methods and other techniques applicable to the same geotechnical special works. These recommendations should permit an adequate application of grouting techniques and contribute to finding solutions for the delicate problem of ground sealing, notably when proceeding with hydrotechnical or environmental structures placed below water table.
Highlights
Various types of trenchless methods are extensively used to create engineering barriers for the purpose of achieving relatively low hydraulic conductivity of the subsoil and hydrotechnical structures
The tests were carried out using BAT system, Cone Penetration Tests (CPT) and drillings
An important feature of the barriers is their durability, especially the lack of loss of tightness and strength associated with the in uence of changing humidity and temperature conditions [10]. This property is strongly dependent on the type of binder, which should be characterized by homogeneous composition and lack of sedimentation, which is the main reason for the lack of resistance to freezing in the case of the construction of screens in the form of walls and ditches lled with hardening slurry, as well as in the case of technology where part of the soil is removed and replaced with a binder
Summary
Abstract: Various types of trenchless methods are extensively used to create engineering barriers for the purpose of achieving relatively low hydraulic conductivity of the subsoil and hydrotechnical structures. The presented test results should help de ne the technical and nancial criteria that should be used to compare grouting based methods and other techniques applicable to the same geotechnical special works These recommendations should permit an adequate application of grouting techniques and contribute to nding solutions for the delicate problem of ground sealing, notably when proceeding with hydrotechnical or environmental structures placed below water table. The use of antiltration screens in the ground and the body of embankments and dams improves their stability, which is important in the case of ood protection facilities Another aim of the sealing works is to prevent unfavorable ltration phenomena, such as su osion or hydraulic piping, which arise as a result of many years of operation of the objects [5].
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