Micro dynamic probing instrument and test method

A test method and miniature technology, which can be applied in the application of repeated force/pulsation force to test the strength of materials, survey of on-site foundation soil, construction, etc. It can solve the problems of difficulty in ensuring the accuracy of penetrating probe indicators, large data errors, and high labor intensity and other problems, to achieve the effect of small size, reduce test error, and easy to carry

Active Publication Date: 2017-08-08
SOUTHEAST UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the commonly used dynamic penetrometer has the following defects in the process of use: heavy weight, difficult operation, high labor intensity, and the accuracy of the penetrating index is difficult to be guaranteed, and the data provided often have large errors

Method used

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  • Micro dynamic probing instrument and test method
  • Micro dynamic probing instrument and test method
  • Micro dynamic probing instrument and test method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Take clay in a certain place as an example for test description. Carry out liquid-plastic limit and specific gravity tests on the clay to obtain the liquid-plastic limit and specific gravity of the clay; carry out direct shear and consolidation tests on the clay to obtain the clay c, value, compression factor, compression modulus, etc.

[0034] (1) Physical property test of clay

[0035] Referring to the "Highway Geotechnical Test Regulations JTG_E40-2007", the liquid limit, plastic limit and specific gravity of the clay were measured according to the disc liquid limit instrument method, the rubbing method and the pycnometer method respectively. The obtained test data are shown in Table 1.

[0036] Table 1 Liquid limit, plastic limit and specific gravity of clay

[0037]

[0038] (2) Consolidation, direct shear, geotechnical micro-dynamic exploration tests

[0039] The soil consolidation, consolidation fast shear and micro-dynamic exploration tests were carried o...

Embodiment 2

[0049] The physical and mechanical properties and micro-dynamic testing of several common soils are carried out, and the relationship between the number of micro-dynamic testing and its characteristic value of bearing capacity is established through correlation calculations.

[0050] According to the data obtained from the physical and mechanical index tests and micro-dynamic tests (hammer weight: 305g) of various cohesive soils, silts and silt-fine sands, the characteristic values ​​of the bearing capacity of various soils and the micro-dynamic tests are analyzed and summarized. The relationship table of hit count is shown in Table 4-Table 6.

[0051] Table 4 Relationship table between the characteristic value of cohesive soil bearing capacity and the number of micro-dynamic exploration strikes

[0052]

[0053] Table 5. The relationship between the eigenvalues ​​of silt bearing capacity and the number of micro-dynamic exploration strikes

[0054]

[0055] Table 6. Rel...

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Abstract

The invention discloses a micro dynamic probing instrument and a test method . The dynamic probing instrument comprises a probe, a probing rod, a hammer base, a guide rod, a replaceable drop hammer and a cover piece; the method comprises following steps: a test mold is used for preparing a sample, the surface of the sample is leveled, and the sample height is recorded; according to the hardness degree of the tested sample, the proper drop hammer is selected and is loaded in the probing rod; a round conical head is aligned with the surface of a soil sample to be detected, and it is ensured that the probing rod is perpendicular to the surface of the soil sample; the drop hammer is lifted to an upper baffle, and is loosened so as to freely drop; when the probing rod enters the sample by 20 mm, the probing rod is taken out, the knocking number of the drop hammer at the moment is recorded, the test is finished, and instrument devices are arranged; a parallel test is carried out; test data are arranged and analyzed. The dynamic probing instrument is small in size, and convenient to carry, operation is easy, a test result can be rapidly obtained, under the site test condition, multiple sets of tests can be achieved, the test error is reduced, and the test precision is improved.

Description

technical field [0001] The invention relates to the technical field of geotechnical engineering testing, in particular to a miniature dynamic detector and a testing method. Background technique [0002] At present, in the construction of housing construction, road engineering, municipal engineering and water conservancy projects, dynamic penetration testing is generally carried out, and dynamic penetration testing is a very important field testing method in geotechnical engineering investigation. The dynamic penetrometer uses the kinetic energy generated by the free fall of its falling hammer to transmit to the cone head through the penetration rod, so that the cone head can overcome the resistance of the soil and penetrate into the soil, and the soil layer can be judged according to the resistance of the penetrating into the soil. The changes in the properties of the soil layer can be mechanically stratified, the physical and mechanical properties of the soil layer can be d...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E02D1/02G01N3/34
Inventor 朱志铎唐震顾素恩
Owner SOUTHEAST UNIV
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