Method for rapidly detecting area unsaturated soil shearing strength

Abstract

The invention relates to a method for rapidly detecting area unsaturated soil shearing strength, which solves the technical problems that matric suction is difficult to measure in real engineering and the unsaturated soil shearing strength formula is not suitable for popularizing in engineering practice. The method has the key point that the soil water characteristic curve is obtained by practically measuring the water content of a soil sample in the area or the parameter of the area, which is relevant to the matric suction is confirmed by searching the drawn water soil characteristic curve of all areas by field measurement through curve fitting; the unsaturated soil shearing strength formula without matric suction phase is further provided by tests; and the inconvenience brought by measuring the matric suction in the field is prevented. The method can rapidly and simply confirm the shearing strength of soil just by providing the conventional characteristic and saturation of the current soil body when in use.

Description

technical field [0001] The invention relates to a method for judging shear strength of regional unsaturated soil, belonging to the technical field of civil engineering, in particular to a method for rapid determination of shear strength of regional unsaturated soil. Background technique [0002] In many geotechnical engineering designs, such as slope stability analysis, foundation pit excavation support design, retaining wall design, etc., the shear strength of soil is a very important engineering index. Although most soils we encounter are in an unsaturated state, the unsaturated mechanical properties of soils are often overlooked. Usually the shear strength of unsaturated soil can be determined by modified direct shear test or unsaturated triaxial test. However, it takes a long time to determine the shear strength of unsaturated soil through experiments, takes up a lot of experimental equipment, and is very expensive, which is very unfavorable for actual engineering desig...

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Problems solved by technology

However, it takes a long time to determine the shear strength of unsaturated soil through experiments, takes up a lot of experimental equipment, and is very expensive, which is very unfavorable for actual engineering design and construction

With the development of unsaturated soil mechanics, a series of unsaturated soil shear strength formulas have been proposed, but most of these formulas consider the matric suction as a single variable, and the test of matric suction in actual engineering is not only in terms of practical operability or accuracy is very difficult

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