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It is difficult to directly measure the dynamic elastic modulus of soils when the strain is less than 10 ⁻⁴ , though the dynamic shear modulus can be easily obtained by the free-vibration testing method. Some improvements were adapted to the traditional free-vibration column for measuring dynamic elastic modulus of soil precisely with lateral vibra...
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A time-varying moment of inertia (MOI) measurement model based on torsion pendulum method is studied. According to the principle of dynamics, the motion equation of torsion pendulum with single degree of freedom is established by using the second Lagrange equation modeling, which indicates the time-varying MOI can be obtained by the instantaneous u...
Citations
... Many monitoring results show that the dynamic strain of subgrade soil is smaller than 10 -4 [21][22][23][24], at which range the resonant column device is advised to measure the dynamic properties of materials [25][26][27]. In this article, the traditional resonant column testing device was improved so that it can be used to test the samples without self-stability. ...
... Resonant column device of GZZ-50 type[27,36]. ...
... Schematic diagram of the process[27]. ...
In order to support the dynamic design of subgrade filling engineering, an experiment on the dynamic shear modulus (G) and damping ratio (D) of clay–gravel mixtures (CGMs) was carried out. Forty-two groups of resonant column tests were conducted to explore the effects of gravel content (0%, 10%, 20%, 30%, 40%, 50%, and 60%, which was the mass ratio of gravel to clay), gravel shape (round and angular gravels), and confining pressure (100, 200, and 300 kPa) on the dynamic shear modulus, and damping ratio of CGMs under the same compacting power. The test results showed that, with the increase of gravel content, the maximum dynamic shear modulus of CGMs increases, the referent shear strain increases linearly, and the minimum and maximum damping ratios decrease gradually. In CGMs with round gravels, the maximum dynamic shear modulus and the maximum damping ratio are greater, and the referent shear strain and the minimum damping ratio are smaller, compared to those with angular gravels. With the increase of confining pressure, the maximum dynamic shear modulus and the referent shear strain increase nonlinearly, while the minimum and maximum damping ratios decrease nonlinearly. The predicting equation for the dynamic shear modulus and the damping ratio of CGMs when considering confining pressure, gravel content, and shape was established. The results of this research may put forward a solid foundation for engineering design considering low-strain-level mechanical performance.
The unmanned underwater tracked bulldozer (UUTB) plays an essential role in emergency rescue caused by natural disasters. The traction force is produced by the interaction between the tracks and the soft sediments on the river bed. The structural parameter has great effects on the traction performance of the UUTB. To evaluate the traction performance produced by track shoes of the UUTB, the mechanical properties of π-shaped track, T-shaped track and V-shaped track are investigated in this paper. The length, width and grouser height of the tracks were changed to obtain the coupling mechanism between structural parameter and traction performance, which provides solid support for optimizing the track structural and improving the traction performance of the UUTB. Moreover, this work also provides dynamics fundamental for the control of anti-slip and stability of the UUTB.
