Method for rapidly detecting area unsaturated soil shearing strength

A technology for rapid determination of shear strength, which is applied in the judgment of regional unsaturated soil shear strength and the field of rapid determination of regional unsaturated soil shear strength. Occupancy and other issues to achieve the effect of improving measurement speed and engineering design practicality

Inactive Publication Date: 2012-01-04
HEBEI CONSTR & INVESTIGATION RES INST
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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 m...

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  • Method for rapidly detecting area unsaturated soil shearing strength
  • Method for rapidly detecting area unsaturated soil shearing strength
  • Method for rapidly detecting area unsaturated soil shearing strength

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Embodiment Construction

[0014] A method for rapid determination of the shear strength of regional unsaturated soil, the method includes determining the saturated cohesion c' of the soil, measuring the total stress σ of the soil, and measuring the pore air pressure u of the soil a , and the soil cohesion c determined according to the comprehensive matrix suction conditions f , the above measurement parameters are comprehensively analyzed by the software program to obtain the shear strength of unsaturated soil. The key is:

[0015] Design and make a database module of soil-water characteristic curve for standardized soil samples: soil samples are characterized by geographical location, soil type, void ratio, and burial depth, and the unearthed water characteristic curve and supporting facilities are drawn according to the corresponding relationship between the external environmental pressure and water content of the soil sample. The modified reference features of , which include volumetric water conten...

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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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Application Information

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IPC IPC(8): G01N33/24
Inventor 梁金国李华伟冯怀平刘利平吴立春王伟张留栓
Owner HEBEI CONSTR & INVESTIGATION RES INST
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