A dynamic penetrometer automatically considering energy correction and dynamic response

Abstract

The invention discloses a power penetrometer capable of automatically taking energy correction and dynamic responses into consideration. The power penetrometer sequentially comprises a drop hammer (7), a stabilizing tail vane (6) and a feeler lever (1) from top to bottom, wherein the upper end of the feeler lever (1) is connected with the stabilizing tail vane (6), third strainometers (4.3) are symmetrically mounted on the inner wall of the upper end of the feeler lever (1), second acceleration sensors (3.2) are symmetrically arranged at the lower end of the stabilizing tail vane (6), a conical tip (2) is arranged at the lowermost end of the feeler lever (1), a first acceleration sensor (3.1) and second strainometers (4.2) are arranged in the portion, above the conical tip (2), inside the feeler lever (1), a friction sleeve (5) is arranged outside the feeler lever (1), and first strainometers (4.1) are arranged on the inner wall of the top of the friction sleeve (5); and the drop hammer (7) which can be automatically triggered to drop is arranged on the upper portion of the stabilizing tail vane (6), and electric signals of all sensors of the penetrometer are transmitted to a data acquisition and analysis instrument (9) through a coaxial cable (8.1) and a signal cable (8.2). The power penetrometer can evaluate dynamic responses and detect the strength of a soil body and has the characteristics of being in situ, multifunctional, automatic and the like.

Description

technical field [0001] The invention relates to a dynamic penetrometer which automatically considers energy correction and dynamic response, and belongs to a dynamic penetrometer in the field of in-situ testing in the field of geotechnical engineering. Background technique [0002] The dynamic penetration test is an in-situ test method used in geotechnical engineering investigation. It uses a drop hammer of a certain quality to drive a standard conical probe into the soil layer with a free fall distance of a certain height. The difficulty of penetration is used to determine the nature of the soil layer. From the basic principle of the dynamic penetrating test, the key issue of the dynamic penetrating test is the transmission and transformation of the axial impact force and hammer energy in the probe rod after the probe rod is impacted by the falling weight. Existing dynamic penetration tests such as standard penetration test (SPT), dynamic penetration testing (DCP) penetrat...

AI Technical Summary

Problems solved by technology

Existing dynamic penetration tests such as standard penetration test (SPT), dynamic penetration testing (DCP) penetration mechanism and design theory still have many ambiguities, and the theory is far behind the practice. The evaluation of the dynamic response of the cone tip 1. There is little research on the conversion of hammering energy, which results in a waste of energy. For the investigation of hard soil sites, the properties of penetrating hard soil layers cannot be effectively detected.

[0003] The laboratory test method relies on sampling technology, so it is affected by sampling disturbance and size effect, and the reliability of the given survey design parameters is not strong

The physical and mechanical property indexes of the measured soil often cannot represent the original state index of the soil layer, which greatly reduces the engineering application value of the soil parameters

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