Device and method for in-situ testing of soil dynamic stress-strain curve

A technology of strain curve and in-situ testing, which is applied in the direction of measuring devices, using repeated force/pulsation force to test the strength of materials, instruments, etc., can solve the problems affecting the measurement of strain and pore pressure, so as to shorten the test period and improve reliability High, wide range of effects

Active Publication Date: 2022-06-28
NANJING HYDRAULIC RES INST
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Problems solved by technology

[0005] (2) During the vibration process, the principal stress direction can only be changed by 90°, in fact, the large principal stress axis swings left and right;
[0007] (4) Necking or protruding of the sample occurs during cyclic loading, causing pore redistribution and affecting the measurement of strain and pore pressure

Method used

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  • Device and method for in-situ testing of soil dynamic stress-strain curve
  • Device and method for in-situ testing of soil dynamic stress-strain curve
  • Device and method for in-situ testing of soil dynamic stress-strain curve

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Embodiment Construction

[0052] The present invention will be further described in detail below with reference to specific embodiments. A detailed implementation manner and a specific operation process are given, and the examples will help to understand the present invention, but the protection scope of the present invention is not limited to the following examples.

[0053]The invention provides a dynamic stress-strain curve in-situ testing device. It consists of four parts: movable system, load servo system, dynamic response system and data acquisition system.

[0054] (1) Movable system

[0055] Special construction vehicle 1: diesel engine (power 250kW), 4-wheel drive.

[0056] (2) Load servo system, which is loaded with microcomputer-controlled electro-hydraulic servo dynamic test control software LETRYTrier6200 / 6210.

[0057] The load servo system is to compare the command signal and the feedback signal, and then use the difference signal to control the entire system, so that the system can c...

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Abstract

The invention discloses a dynamic stress-strain curve in-situ test device, which includes a movable system, a dynamic response system, a load servo system and a data acquisition system. The device of the invention is powered by a hydraulic source, and can operate at preset frequencies, amplitudes, The vertical dynamic load is applied to the rigid plate of the vibrator under the number of loading cycles, thereby spreading into the foundation soil. After the pre-embedded sensor senses the measured information, it is converted into a fixed form of signal output by the data acquisition system, which can be analyzed and processed. The working method provides a new method for the field test problem of soil dynamic stress-strain curve.

Description

technical field [0001] The invention belongs to the technical field of civil engineering, and particularly relates to an in-situ testing device and method for soil dynamic stress-strain curves. Background technique [0002] The high density of urban population, urban construction and urban traffic, and the rapid development of urban economy mean that the study of earthquake problems faced by large and super-large cities has become a daunting task that earthquake engineering researchers must face. Earthquakes not only release a large amount of energy, but also lead to a large number of secondary disasters. There are many disasters related to geotechnical soil, such as: debris flow, earthquake liquefaction of sand and soil, landslide, soft foundation collapse, etc. The most serious of which is soil Physical damage. [0003] The quantification of the dynamic stress-strain curve is indispensable in the analysis process of establishing the soil dynamic constitutive model. At pr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N3/36G01N3/38G01N3/02
CPCG01N3/36G01N3/38G01N3/02G01N2203/0005G01N2203/0048G01N2203/005G01N2203/0075G01N2203/0676G01N2203/0682
Inventor 范明桥顾伟杰钱彬张志韬张兴刚包孟碟
Owner NANJING HYDRAULIC RES INST
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