Soft rock strength test needle penetration instrument and use method thereof

A technology of strength testing and penetrometer, which is applied in the direction of applying repeated force/pulsation force to test the strength of materials, can solve the problems of difficulty in ensuring that the penetrating needle is vertical to the rock surface, low accuracy of manual reading, and high consumption of penetrating needles. Achieve the effects of increased test success rate, convenient data collection, and improved leveling performance
CN109708985APending Publication Date: 2019-05-03YANGZHOU UNIV
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
YANGZHOU UNIV
Publication Date
2019-05-03

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Abstract

The invention, which belongs to the technical field of geotechnical engineering detection, provides a soft rock strength test needle penetration instrument and a use method thereof. The soft rock strength test needle penetration instrument comprises a needle penetration instrument body, a connection buckle and a tripod that are connected. An electromagnetic coil is electrified; a center penetration hammer moves upward under the effect of the electromagnetic field to accumulate potential energy; after power interruption, the center penetration hammer makes free falling body movement and the potential energy is converted into kinetic energy, so that the penetration needle is hammered to apply pressures on the soft rock; and the falling distance of the center penetration hammer is controlledbased on the currents and thus the instrument can reach balancing every time in force applying. With a tripod leveling instrument, circular leveling bubble observation is carried out, so that the leveling performance of the instrument in operation is improved; the experimental success rate is further increased; a pressure sensor and a displacement sensor are used for replacing the manual countingmethod of the traditional penetration instrument, so that the result accuracy is improved; with an external device, the hammer number of times of the center penetration hammer is controlled and data are read; and the intelligent degree is increased and data are collected conveniently and precisely.
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Description

technical field

[0001] The invention belongs to the technical field of geotechnical engineering detection, and relates to a rock-soil strength testing instrument and a using method thereof, in particular to a soft rock strength testing needle penetrator and a using method thereof. Background technique

[0002] Uniaxial compressive strength is the most used property for rock mass classification and rock mass characterization, and it is also an important parameter in different calculation and design methods in geotechnical engineering. Usually, the uniaxial compressive strength of rock mass is tested by making standard rock sample specimens and measured by related large-scale instruments and equipment. However, it is difficult to make standard rock samples for soft rocks with a high degree of weathering and incomplete diagenesis. Difficult to conduct follow-up experiments. The International Society of Rock Mechanics (ISRM) recommends using a needle penetrometer produced in Ja...

Claims

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