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Method and system for testing fracture toughness of incompact soil body

A technology of fracture toughness and testing method, which is applied in the direction of testing the strength of materials by applying a stable bending force, and can solve the problems of difficult test piece forming and test operation

Inactive Publication Date: 2012-06-27
CHINA THREE GORGES UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The American Society for Testing and Materials specification ASTM E399-83 is the most authoritative technical standard for material fracture testing in the world so far. It requires that the test piece be prepared as a rectangular test piece with a height of not less than 40cm, a width of not less than 20cm, and a length of not less than 100cm. For the soil, it is extremely difficult to form the specimen and test the operation

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  • Method and system for testing fracture toughness of incompact soil body
  • Method and system for testing fracture toughness of incompact soil body
  • Method and system for testing fracture toughness of incompact soil body

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[0033] attached figure 1 It is a three-dimensional schematic diagram of the loose soil fracture toughness testing system of the present invention. In the figure, 1 is a rectangular test piece, 2 is a load bearing support, 3 is a rectangular test piece bearing plate, 4 is a fixed pulley, and 5 is a loading line. 6 is a tension device, 7 is a measuring device, 8 is a wire, and 9 is a loader. As can be seen from the figure, the loose soil fracture toughness test system of the present invention includes: a test piece placing device, a load control device and a measuring device, wherein,

[0034] The specimen placement device includes two load bearing supports 2 and a rectangular specimen bearing plate 3; the cross section of the load bearing support 2 is an equilateral triangle with a side length of 30 mm and a height of 250 mm; two load bearing supports The seat 2 is fixed on the test bench in a straight line, one of the corners serves as a fulcrum to directly bear the rectangul...

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Abstract

In order to promote relevant scientific researches on fracture of an incompact soil body and effectively prevent and control geological disasters, such as incompact soil body landslide, soil slope, slope debris flow and the like, the invention provides a method and a system for testing the fracture toughness of the incompact soil body. The method comprises the following steps of: making the incompact soil body with different water content and different compactness into a rectangular test piece; continuously loading a three-point bending load on the rectangular test piece; and when the rectangular test piece starts to fracture, measuring the fracture toughness of the incompact soil body. According to the method and the system for testing the fracture toughness of the incompact soil body, the fracture toughness of the incompact soil body with different water content and different compactness can be tested; according to the test method, a requirement of the American society for testing material (ASTM) E399-83 is met; the deformation, cracking and damage system of the surface of a soil slope can be analyzed; and the method and the system have great significance for promoting relevant scientific researches on the fracture of the incompact soil body and effectively preventing and controlling geological disasters, such as incompact soil body landslide, soil slope, slope debris flow and the like.

Description

[0001] technical field [0002] The invention relates to a civil engineering testing method and special equipment, in particular to a testing method and system for fracture toughness of loose soil. Background technique [0003] Soil is a medium material closely related to the earth's surface and human living environment and engineering activities. Geological disasters such as slope instability, slope debris flow, and bank failure are all related to the physical and mechanical parameters of the soil. "Soil Engineering Test Regulations" (SD128-84) gives detailed test methods for physical and mechanical parameters such as soil density, specific gravity, plastic liquid limit, expansion, penetration, compaction, consolidation, triaxiality, and soluble salts. "Code for Geotechnical Engineering Investigation" ( GB50021-2001) focuses on specific soil, groundwater, on-site in-situ test, indoor soil compression, consolidation, penetration, shear, dynamic and other related test methods...

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Application Information

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IPC IPC(8): G01N3/20
Inventor 陈洪凯唐兰廖培伟叶永王林峰
Owner CHINA THREE GORGES UNIV
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