Bionic Concave Pit-Like Metal Surface and Soil Direct Shear Test

2012 ◽  
Vol 569 ◽  
pp. 451-454 ◽  
Author(s):  
Ya Ming Tang ◽  
Yang Tian
Keyword(s):  
Metal Surface ◽  
Shear Force ◽  
Smooth Surface ◽  
Direct Shear Test ◽  
Shear Test ◽  
Shear Displacement ◽  
Direct Shear ◽  
Typical Soil

In order to test the reducing adhesion and resistance effect of bionic metal non-smooth surface, the direct shear test is experimented on a kind of bionic dredging tools with typical soil and bionic concave pit-like metal surface.The relation of shear force and shear displacement on a certain pressure is presented. The result will help to design the structure of cutting soil tools’ surfaces with less adhesion and resistance.

Bionic Semi-Cylindrical Metal Surface and Soil Direct Shear Test

2012 ◽  
Vol 157-158 ◽  
pp. 70-73
Author(s):  
Ya Ming Tang ◽  
Xue Jia
Keyword(s):  
Metal Surface ◽  
Shear Force ◽  
Smooth Surface ◽  
Direct Shear Test ◽  
Shear Test ◽  
Shear Displacement ◽  
Direct Shear ◽  
Cylindrical Metal

In order to test the reducing adhesion and resistance efficient of bionic semi-cylindrical metal non-smooth surface, the direct shear test is experimented on a kind of bionic dredging tools with typical bionic half- circularity metal surface non-smooth surface. The relation of shear force and shear displacement on a certain pressure is presented. The result will help to design the structure of cutting soil tools’ surfaces with less adhesion and resistance.

scholarly journals Investigation of the Shear Mechanical Behavior of Sandstone with Unloading Normal Stress after Freezing–Thawing Cycles

Machines ◽  
2021 ◽  
Vol 9 (12) ◽  
pp. 339
Author(s):  
Shuailong Lian ◽  
Jiashen Li ◽  
Fei Gan ◽  
Jing Bi ◽  
Chaolin Wang ◽  
...  
Keyword(s):  
Fracture Surface ◽  
Mechanical Behavior ◽  
Normal Stress ◽  
Direct Shear Test ◽  
Shear Test ◽  
Shear Displacement ◽  
Normal Displacement ◽  
Direct Shear ◽  
Thawing Cycle ◽  
Unloading Rate

Freezing–thawing action has a great impact on the physical and mechanical deterioration processes of rock materials in cold areas where environmental changes are very complicated. The direct shear test under unloading normal stress was adopted to investigate the shear mechanical behavior of sandstone samples after a freezing–thawing cycle in this paper. The failure shear displacement (Dsf), the failure normal displacement (Dnf), the shear displacement of unloading (Dsu), and the normal displacement of unloading (Dnu) were analyzed to describe the evolution of shear and normal deformation during the test. The results indicated that the shear displacement increased as the freezing–thawing cycle duration increased in a direct shear test under unloading normal stress. The unloading rate and the number of freezing–thawing cycles affected the failure pattern of the rock sample significantly in both the direct shear test under unloading normal stress and the direct shear test. The three-dimensional inclination angle, the distortion coefficient, and the roughness correlation coefficient of the fracture surface are dependent on the number of freezing–thawing cycles and the unloading rate. The surface average gradient mode of the fracture surface decreased as the freezing–thawing cycle times and unloading rate rose.

scholarly journals Influence of Structural Plane Microscopic Parameters on Direct Shear Strength

2018 ◽  
Vol 2018 ◽  
pp. 1-7 ◽  
Author(s):  
Yanhui Cheng ◽  
Weijun Yang ◽  
Dongliang He
Keyword(s):  
Particle Size ◽  
Shear Strength ◽  
Internal Friction ◽  
Direct Shear Test ◽  
Shear Test ◽  
Friction Angle ◽  
Internal Friction Angle ◽  
Direct Shear ◽  
Stiffness Ratio ◽  
Structural Plane

Structural plane is a key factor in controlling the stability of rock mass engineering. To study the influence of structural plane microscopic parameters on direct shear strength, this paper established the direct shear mechanical model of the structural plane by using the discrete element code PFC2D. From the mesoscopic perspective, the research on the direct shear test for structural plane has been conducted. The bonding strength and friction coefficient of the structural plane are investigated, and the effect of mesoscopic parameters on the shear mechanical behavior of the structural plane has been analyzed. The results show that the internal friction angle φ of the structural plane decreases with the increase of particle contact stiffness ratio. However, the change range of cohesion is small. The internal friction angle decreases first and then increases with the increase of parallel bond stiffness ratio. The influence of particle contact modulus EC on cohesion c is relatively small. The internal friction angle obtained by the direct shear test is larger than that obtained by the triaxial compression test. Parallel bond elastic modulus has a stronger impact on friction angle φ than that on cohesion c. Under the same normal stress conditions, the shear strength of the specimens increases with particle size. The shear strength of the specimen gradually decreases with the increase of the particle size ratio.

Soil Shear Strength Characteristic in Slope Disintegration Area

2013 ◽  
Vol 353-356 ◽  
pp. 735-739
Author(s):  
Xiao Ming Zhang ◽  
Shu Wen Ding ◽  
Shuang Xi Li
Keyword(s):  
Shear Strength ◽  
Direct Shear Test ◽  
Shear Test ◽  
Clay Content ◽  
Scientific Basis ◽  
Soil Mechanic ◽  
Direct Shear ◽  
Soil Cohesion ◽  
Soil Shear Strength ◽  
The Relationship

Development of slope disintegration is close to soil mechanic characteristics such as shear strength indices. Soil grain diameter and water content were tested. Soil direct shear test was conducted to analyze the relationship between shear strength indices and the influencing factors. The experimental data indicate that clay content and the range affect soil cohesion value and the scope. Soil cohesion increases with bulk density before 1.6g/cm3. But it decreases when the bulk after that. The results could provide a scientific basis for control of slope disintegration.

Experimental investigation on concrete subjected to direct shear test

2021 ◽  
Author(s):  
P.R. Kalyana Chakravarthy ◽  
R. Rakesh ◽  
T. Kiran ◽  
S. Sivaganesan ◽  
A. Parthiban
Keyword(s):  
Experimental Investigation ◽  
Direct Shear Test ◽  
Shear Test ◽  
Direct Shear

Evaluasi Pengaruh Sifat Mikro-Fisik dan Bentuk Butiran terhadap Karakteristik Kuat Geser pada Pasir Vulkanik dan Pasir Pantai

2021 ◽  
Vol 1 (2) ◽  
pp. 584-597
Author(s):  
Chatherine Grace Maulina ◽  
◽  
Dian Sisinggih ◽  
Andre Primantyo Hendrawan ◽  
◽  
...  
Keyword(s):  
Direct Shear Test ◽  
Shear Test ◽  
Direct Shear

Pasir merupakan salah satu bahan geoteknik yang memiliki peranan yang sangat penting, misalnya sebagai bahan timbunan urugan, timbunan backfill di belakang dinding penahan, maupun bahan filter. Pasir berasal dari berbagai sumber dan proses geologi yang berbeda, sehingga pasir vulkanik dan pasir pantai akan memiliki karakteristik fisik, mineralogi, dan bentuk butiran yang berbeda pula. Penelitian ini melakukan serangkaian uji di laboratorium dengan benda uji berupa material pasir: (1) pasir vulkanik sungai aliran lahar dari hasil erupsi Gunung Kelud di Kali Putih Blitar, (2) pasir pantai dari beberapa pantai di Kabupaten Malang yaitu Pantai Wonogoro, Pantai Jolangkung, dan Pantai Goa Cina. Aspek bentuk butiran meliputi roundness, sphericity, dan tekstur. Analisis pengujian dari SEM dan X-RD untuk menentukan karakteristik mikro-fisik dan bentuk butiran pasir secara mendetail. Pengujian geser langsung (direct shear test) untuk menentukan kuat geser dari tanah pasir. Pasir vulkanik memiliki permukaan butiran yang lebih kasar dari pasir pantai sehingga sudut geser dalam yang didapatkan lebih besar dari sampel pasir pantai. Karena tanah pasir tidak memiliki kohesi maka kekuatannya hanya pada sudut geser dalam; dengan demikian, pengaruh aspek mikro-fisik dan bentuk butiran pasir terhadap karakteristik kuat gesernya harus diperhitungkan untuk aplikasinya sebagai material geoteknik.

Sign in / Sign up

Export Citation Format

Share Document