Expansive soil slope shallow-layer damaged soil body shear strength test method

A technique of shear strength, test method, applied in the direction of testing the strength of materials by applying a stable shear force, etc.

Inactive Publication Date: 2015-11-25
CHANGSHA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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Problems solved by technology

[0005] The purpose of the present invention is to provide a method for testing the shear strength of expansive soil slope shallow-layer damaged soil, aiming at solving the problem that the s

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  • Expansive soil slope shallow-layer damaged soil body shear strength test method
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  • Expansive soil slope shallow-layer damaged soil body shear strength test method

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Embodiment Construction

[0026] In order to further understand the content and characteristics of the present invention, the following embodiments are given as examples, and detailed descriptions are as follows in conjunction with the accompanying drawings.

[0027] Such as figure 1 As shown, the expansive soil slope shallow layer failure soil shear strength test method of the embodiment of the present invention comprises:

[0028] S101. Sample preparation, use a ring knife to cut the original soil sample, and ensure that the sample is closely attached to the wall of the ring knife when cutting; the density difference and moisture content difference of the parallel test samples are not greater than ±0.1g / cm 3 and 1%;

[0029] S102, performing a dry-wet cycle on the sample under load;

[0030] S103, the dry-wet cycle saturated sample is saturated and consolidated under the corresponding vertical pressure;

[0031] S104. Select the force measuring ring according to the actual shear strength, start th...

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Abstract

The invention discloses an expansive soil slope shallow-layer damaged soil body shear strength test method. The method comprises the following steps: performing vacuum saturation on a test sample, applying normal stress corresponding to stress during shearing on the test sample in a water tank for water soaking curing saturation so as to enable the test sample to fully absorb water until the test sample is expanded completely, drying the expanded rest sample in a constant temperature oven until the test sample obtains the constant weight, and repeating the steps until preset drying and watering cycle times are finished, so that the effect of the drying and watering cycle of air can be truly reflected. According to the method, the effective normal stress contains relatively small effective normal stress capable of reflecting an actual stressing state of a soil body; the drying and watering cycle of the air is considered, and an equivalent load effect consistent to the normal stress during shearing is applied in the drying and watering cycle expanding process; shear strength test results are fitted by adopting an improved power function replacing a Moore Coulomp linear function, so that the shear strength, in the actual stress state, of the expansive soil slope shallow-layer damaged soil body can be truly reflected.

Description

technical field [0001] The invention belongs to the field of road engineering, and in particular relates to a method for testing the shear strength of expansive soil slope shallow layer damaged soil. Background technique [0002] Because expansive soil is rich in highly hydrophilic minerals such as montmorillonite, and has significant dry shrinkage and wet expansion characteristics, the study of its slope stability is much more complicated than that of ordinary clay slopes, especially its shear strength parameters are difficult to be accurate Sure. The current highway subgrade design code (JTGD30-2004) proposes that the shear strength index of expansive soil should be lower than the peak strength value, and the index value can also be determined by back calculation or experience, which exposes the complexity of the value of the strength parameter, which is difficult to grasp. Uncertainty; in addition, it is usually impossible to explain why expansive soil slopes are destabi...

Claims

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Application Information

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IPC IPC(8): G01N3/24
Inventor 肖杰杨和平唐咸远倪啸
Owner CHANGSHA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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