True in-situ shear test method and true in-situ shear tester used by same

Abstract

The invention relates to a true in-situ shear test method and a true in-situ shear tester used in the field of geotechnical engineering in-situ test. The true in-situ shear test method is as follows:after the true in-situ shear tester is placed to a predetermined depth, a shear plate (2) is opened and inserted into a soil body, and the stress and displacement of the shear plate (2) are measured while the earth surface is metered and read. The true in-situ shear tester for realizing the test method comprises a loading system (12), a shear plate support (3), a shear plate (2), a force-sensitivesensor (5) and a displacement sensor (6). The invention provides multiple modes and corresponding instruments for realizing the test, which can conveniently determine mechanical property characteristic indexes such as strength and rigidity of an in-situ soil body. The technical scheme is simple and rapid in test operation, wherein test cost is low, the physical and mechanical significance of testresults is clear, the test results have the advantage of multiple parameters, and the method is easy to apply to engineering design calculation and has huge application and popularization value.

Description

technical field [0001] The invention relates to the field of geotechnical engineering in-situ testing. Background technique [0002] The research on the mechanical properties of soil is of great significance to engineering construction. At present, the research in this field is in the ascendant. Since the soil is naturally formed, the in-situ test of the mechanical properties of soil is one of the important links in engineering construction. It is commonly used in engineering practice. The geotechnical engineering in-situ test methods mainly include static penetration test, standard penetration test, cross plate direct shear test, side pressure test, flat shovel test, in-situ load plate test and other test methods. Among the above-mentioned geotechnical engineering in-situ test methods, the static penetration test has been rapidly popularized and applied in recent years because of its relatively simple test device, but this kind of static penetration test is to insert a cone...

AI Technical Summary

Problems solved by technology

Among them, the single-bridge static penetration test mainly measures the specific penetration resistance value of the conical probe through the test to reflect the mechanical properties of the soil. The double-bridge static penetration test can measure the cone tip resistance value and the cone side resistance value. value, the pore pressure static penetration test can not only measure the test parameters of the double bridge static penetration test, but also measure the pore water pressure and its dissipation in the soil during the probe penetration process, because the static penetration test The geotechnical parameters are tested by inserting a conical probe into the soil. During the test, the conical probe must be pressed into the soil by pressure. The size of the test probe is small, and the probe is a cone. In the test process, the boundary conditions Fuzzy, the physical and mechanical meaning of the test parameters is vague. Although this test method has been widely used in geotechnical engineering in-situ testing, it is difficult to directly use the test parameters for geotechnical engineering design calculations in engineering practice.

The standard penetration test is a relatively traditional in-situ test method, but the test results are single, and it is difficult to be directly used for geotechnical engineering design calculations. The test results of the bit test method are discontinuous, the test operation is more complicated, and the test cost is higher, which is restricted to a greater extent in engineering applications

[0003] According to the public information and patent novelty search results, the latest comparative information is a special probe for geotechnical engineering in-situ rotary penetrating penetration, application number: 200710059768.6, the in-situ testing technology disclosed in the patent specification of the invention is through the drilling process of the drill bit The corresponding parameter test reflects the mechanical properties of the soil. Compared with the above-mentioned commonly used in-situ test technology, this test technology does provide a new in-situ test idea, but the physical and mechanical meaning of the test results of this technology is still very vague. The strength and deformation parameters of the soil cannot be calculated from the test results, and it is difficult to directly use it in the design calculation of geotechnical engineering

[0004] At present, geotechnical engineering in-situ testing technology is far from meeting the needs of engineering construction

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