A novel approach to estimate soil penetrometer resistance from water content, bulk density, and shear wave velocity: A laboratory study on a loamy sand soil

Geoderma ◽  
2020 ◽  
Vol 368 ◽  
pp. 114276 ◽  
Author(s):  
Wencan Zhang ◽  
Weida Gao ◽  
Tusheng Ren ◽  
W. Richard Whalley
Keyword(s):  
Water Content ◽  
Bulk Density ◽  
Shear Wave ◽  
Wave Velocity ◽  
Laboratory Study ◽  
Shear Wave Velocity ◽  
Sand Soil ◽  
Penetrometer Resistance ◽  
Loamy Sand Soil ◽  
Novel Approach

Shear‐wave velocity anisotropy in sedimentary rocks: A laboratory study

Geophysics ◽  
1988 ◽  
Vol 53 (6) ◽  
pp. 800-806 ◽  
Author(s):  
Chandra S. Rai ◽  
Kenneth E. Hanson
Keyword(s):  
Shear Wave ◽  
Wave Velocity ◽  
Laboratory Study ◽  
Shear Wave Velocity ◽  
Rock Sample ◽  
Hydrostatic Stress ◽  
Sedimentary Rocks ◽  
Uniaxial Stress ◽  
Velocity Anisotropy

A systematic laboratory study of shear‐wave velocity anisotropy in sedimentary rocks has been carried out as a function of both hydrostatic and uniaxial stress. The presence of shear‐wave velocity anisotropy in sedimentary rocks was confirmed by transmitting a polarized shear wave in a rock sample and receiving a signal on an orthogonally polarized receiver. The magnitude of the observed velocity anisotropy is dependent upon the magnitude and nature of the applied stress and the lithology of the rock sample. Shales exhibit significant velocity anisotropy independent of both uniaxial and hydrostatic stress, which suggests the presence of preferentially aligned minerals. Sandstones also exhibit significant velocity anisotropy, but the anisotropy is strongly dependent upon the stress. Hydrostatic stress was found to diminish the velocity anisotropy and uniaxial stress was found to enhance it. This implies the presence of preferentially oriented cracks. Limestones exhibit weak velocity anisotropy. These laboratory observations may be helpful in in situ identification of lithology.

Study on Poisson Ratio of Soil-Rock Mixture in Low Strain

2011 ◽  
Vol 90-93 ◽  
pp. 1921-1925 ◽  
Author(s):  
Xian Min Zhang ◽  
Yao Zhi Lv ◽  
Yi Ming Zhao ◽  
Yu Hui Zhang ◽  
Zhi Liao
Keyword(s):  
Water Content ◽  
Shear Wave ◽  
Wave Velocity ◽  
Shear Wave Velocity ◽  
Poisson Ratio ◽  
Nonlinear Models ◽  
Absolute Error ◽  
Longitudinal Wave Velocity ◽  
Mixture Samples ◽  
The Relationship

Longitudinal wave velocity and shear wave velocity of two kinds of the soil-rock mixture samples with different stone content and water content are tested. Then the poisson ratio of the samples in Low Strain can be calculated with the method of wave velocity testing. Analyzing the relationship between poisson ratio, water content and stone content, the dualistic nonlinear models of poisson ratio, water content and stone content are established. The result of verifying is shown that the absolute error of poisson ratio is less than 0.01 and the relative error is less than 2%. The models not only can show the relationship between poisson ratio, water content and stone content but can provide the reference when changing the Rayleigh wave velocity to shear wave velocity each other.

scholarly journals Piezoelectric Ring Bender for Characterization of Shear Waves in Compacted Sandy Soils

Sensors ◽  
2021 ◽  
Vol 21 (4) ◽  
pp. 1226
Author(s):  
Dong-Ju Kim ◽  
Jung-Doung Yu ◽  
Yong-Hoon Byun
Keyword(s):  
Shear Modulus ◽  
Water Content ◽  
Shear Wave ◽  
Wave Velocity ◽  
Shear Wave Velocity ◽  
Shear Waves ◽  
Small Strain ◽  
The Other ◽  
Compacted Soils ◽  
Small Strain Shear Modulus

Shear wave velocity and small-strain shear modulus are widely used as the mechanical properties of soil. The objective of this study is to develop a new shear wave monitoring system using a pair of piezoelectric ring benders (RBs) and to evaluate the suitability of RB in compacted soils compared with the bender element and ultrasonic transducer. The RB is a multilayered piezoelectric actuator, which can generate shear waves without disturbing soils. For five compacted soil specimens, the shear waves are monitored by using three different piezoelectric transducers. Results of time-domain response show that the output signals measured from the RB vary according to the water content of the specimen and the frequency of the input signal. Except at the water content of 9.3%, the difference in the resonant frequencies between the three transducers is not significant. The shear wave velocities for the RB are slightly greater than those for the other transducers. For the RB, the exponential relationship between the shear wave velocity and dry unit weight is better established compared with that of the other transducers. The newly proposed piezoelectric transducer RB may be useful for the evaluation of the shear wave velocity and small-strain shear modulus of compacted soils.

Measuring soil bulk density from shear wave velocity using piezoelectric sensors

Soil Research ◽  
2021 ◽  
Vol 59 (1) ◽  
pp. 107
Author(s):  
Mohammad Omar Faruk Murad ◽  
Budiman Minasny ◽  
Brendan Malone ◽  
Kip Crossing
Keyword(s):  
Bulk Density ◽  
Shear Wave ◽  
Wave Velocity ◽  
Shear Wave Velocity ◽  
Management Practices ◽  
Empirical Relationship ◽  
Coefficient Of Determination ◽  
Soda Lime Glass ◽  
Physical Parameters ◽  
Soil Density

Bulk density and soil stiffness moduli are vital physical parameters related to soil compaction, porosity, moisture storage capacity, soil penetration resistance and structural integrity. Conventional methods for measuring soil density and stiffness moduli are destructive, time-consuming, complex, expensive and often require skilled operators to conduct the tests. A new soil density and stiffness moduli measurement technique that can evaluate soil density and stiffness moduli more rapidly, efficiently and precisely, at a low cost is introduced here. This study evaluated the use of shear wave velocity measurements using the piezoelectric extender and bender elements as a viable alternative to measure soil density and stiffness moduli of soil. To test this idea, soda-lime glass beads of <0.002, 0.04–0.07 and 1.00–1.30 mm in diameter were used to develop the empirical relationship between the shear wave velocity and the bulk density of soil in laboratory conditions. These empirical equations were then tested on sands and clayey soils for validation. Accuracy in terms of coefficient of determination (R2) and root mean squared error (RMSE) from the current and existing studies ranged within 0.91–0.93 and 0.073–0.177 g cm–3 respectively. Both shear and Young moduli were compared with the shear wave velocity of soil, with R2 and RMSE of 0.96–0.97 and 0.48–3.5 MPa respectively. The major advantage of this technique is that input and output signal data can be stored in a computer that can be used to calculate soil density and stiffness moduli automatically. This technique could play a vital role in improving crop yield and soil management practices.

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