Direct Shear Creep Characteristics of Sand Treated with Microbial-Induced Calcite Precipitation

2022 ◽  
Author(s):  
Jie Yuan ◽  
Donglin Lei ◽  
Yi Shan ◽  
Huawei Tong ◽  
Xiaotian Fang ◽  
...  
Keyword(s):  
Direct Shear ◽  
Calcite Precipitation ◽  
Shear Creep ◽  
Creep Characteristics

Experimental Study on Direct Shear Creep Characteristics and Long-Term Strength of Red Layer Sliding Zone Soil in Southern Hunan

2013 ◽  
Vol 842 ◽  
pp. 782-787 ◽  
Author(s):  
Feng Zhu ◽  
Zhong Yuan Duan ◽  
Zhen Yu Wu ◽  
Yu Qi Wu ◽  
Tian Long Li ◽  
...  
Keyword(s):  
Shear Stress ◽  
Term Strength ◽  
Direct Shear ◽  
Creep Tests ◽  
Shear Creep ◽  
Creep Characteristics ◽  
Southern Hunan ◽  
Sliding Soil ◽  
Sliding Zone

The creep characteristics of red layer sliding soil under the condition of different vertical loads and water contents were studied through a series of direct shear creep tests. Tests results showed that the water infiltrated to the sliding zone along the fissure of red layer sliding belt due to the crush of red layer sliding rock, leading to softening of sliding zone and acceleration of shear creep. When the shear stress reached the limit of long-term shear strength, sliding soil was broken suddenly with small vertical loads (50 kPa and 100kPa), while the sliding soil presented as a constant acceleration creep with enough vertical loads (200 kPa and 300 kPa). The inflection point in shear stress-shear displacement isochronous curve corresponded to the long-term strength of the soil.

Behavior of microcontacts in rock joints under direct shear creep loading

2015 ◽  
Vol 78 ◽  
pp. 217-229 ◽  
Author(s):  
Jin-an Wang ◽  
Yu-xi Wang ◽  
Qiu-ju Cao ◽  
Yang Ju ◽  
Ling-tao Mao
Keyword(s):  
Rock Joints ◽  
Direct Shear ◽  
Shear Creep ◽  
Creep Loading

scholarly journals Time Dependent Behavior of Soil during Direct Shear Creep

Landslides ◽  
1981 ◽  
Vol 17 (4) ◽  
pp. 20-27_1
Author(s):  
Fujiya Komamura
Keyword(s):  
Time Dependent ◽  
Direct Shear ◽  
Shear Creep ◽  
Dependent Behavior

Shear creep characteristics and constitutive model of limestone

2016 ◽  
Vol 26 (3) ◽  
pp. 423-428 ◽  
Author(s):  
Mei Yu ◽  
Xianbiao Mao ◽  
Xinyu Hu
Keyword(s):  
Constitutive Model ◽  
Shear Creep ◽  
Creep Characteristics

scholarly journals Downdrag Loads Developed by a Floating Ice Cover: Field Experiments

1974 ◽  
Vol 11 (3) ◽  
pp. 339-347 ◽  
Author(s):  
R. Frederking
Keyword(s):  
Shear Stress ◽  
Steady State ◽  
Field Experiments ◽  
Ice Cover ◽  
Steady State Creep ◽  
Displacement Rate ◽  
Efficient Design ◽  
Shear Creep ◽  
Creep Characteristics ◽  
Applied Shear Stress

The first phase of an investigation of the vertical forces developed on a structure by a floating ice cover frozen to it is described. It is the objective of this work to develop the theoretical, experimental, and field aspects of vertically acting loads required for the more efficient design of structures subject to such loads. A load frame was constructed that would apply constant upward acting loads to wooden piles frozen into an ice cover composed mainly of snow ice. Load, ice temperatures, and movement of the pile in relation to the ice were measured.The time-dependent movement of the pile in relation to the ice exhibited creep characteristics, and these results were related to shear creep for grouted rod anchors in permafrost. Results of a previous study for WF steel H-beams in ice were also considered. The steady-state creep displacement rate for wooden piles in ice, rod anchors in permafrost, and WF steel H-beams in ice exhibited a comparable dependence on the constant applied shear stress. The steady-state creep displacement rate of a 100-mm wooden pile in snow ice at −3 °C and under a constant applied shear stress of 180 kN/m2 was about 1 mm/day.

scholarly journals Direct Shear Creep Characteristics and Microstructure of Fiber-Reinforced Soil

2021 ◽  
Vol 2021 ◽  
pp. 1-12
Author(s):  
Hao Tang ◽  
Huahua Li ◽  
Zhao Duan ◽  
Chiyang Liu ◽  
Guannan Wu ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Fiber Reinforcement ◽  
Reinforced Soil ◽  
Fiber Content ◽  
Direct Shear ◽  
Fiber Reinforced ◽  
Creep Tests ◽  
Shear Creep ◽  
Before And After ◽  
Fiber Reinforced Soil

Fiber-reinforced soil is an excellent engineering material that has become a focus of research. Most studies focus on the conventional mechanical properties of reinforced soil, such as its tensile, compressive, and shear strength, and rarely study its creep-related mechanical properties. However, when such soil is used as backfill, the creep effect should not be ignored. This study explored the characteristics of creep mechanics in reinforced soil, the fiber-reinforcement mechanism, and the dynamics of microstructures before and after creep tests. Direct shear creep tests were carried out using a direct shear creep tester on soil reinforced with natural palm fibers of equal length (1.5 cm) in different amounts (0%, 0.2%, 0.6%, 1.0%). Microscale tests were carried out on the reinforced soil samples before and after the creep tests by polarized light and scanning electron microscopy. The results show that the fiber reinforcement can restrain the deformation and enhance the long-term strength of soil. However, a nonlinear relationship between the reinforcement effect and fiber content was found, with 0.6% being the optimal content. Palm fibers have rough surfaces, grooves, and independent pore chambers, which increase the effective contact area and interaction with the soil. With increases in fiber content, the fibers interweave to form a nestled network structure, which increases the strength and integrity of the soil. Fiber addition changes the microstructure of the soil pores; the proportion of large pores decreases and that of small pores increases. Under the effect of creep, the pore changes follow the principle of pore homogenization; large pores are destroyed and transformed into small pores, causing the porosity of reinforced soil to decrease faster and be less porous than unreinforced soil. This research can provide technical reference for the engineering application of palm fiber-reinforced soil.

A Constitutive Model for the Creep Behavior of Offwhite Marbles

2012 ◽  
Vol 4 (03) ◽  
pp. 354-364
Author(s):  
X. D. Song ◽  
J. H. Ren
Keyword(s):  
Mechanical Properties ◽  
Constitutive Model ◽  
Creep Behavior ◽  
Deformation Behavior ◽  
Experimental Measurements ◽  
Viscoplastic Deformation ◽  
Shear Creep ◽  
Creep Characteristics ◽  
Linear Creep ◽  
Improved Model

AbstractThis paper reports an improved constitutive model for the shear creep behavior of offwhite marbles which are selected from slope and underground cavern and contain green schist’s weak structural planes. The shear creep behavior of the samples is characterized using the rheological tests. Based on the experimental measurements on mechanical properties under different normal stress conditions, an improved model is proposed to analyze the experimental results. It is demonstrated from a further discussion that such model can reflect the non-linear creep characteristics of structural planes, and especially, it is suitable for description of the viscoelastic and viscoplastic deformation behavior of structural planes.

scholarly journals Creep properties of clastic soil in a reactivated slow-moving landslide in the Three Gorges Reservoir Region, China

2021 ◽  
Author(s):  
shun wang ◽  
Jinge Wang ◽  
Wei Wu ◽  
Deshan Cui
Keyword(s):  
Shear Strength ◽  
Shear Zone ◽  
Movement Pattern ◽  
Direct Shear ◽  
Creep Tests ◽  
Shear Creep ◽  
Residual Shear Strength ◽  
Ring Shear ◽  
Slow Moving

Most slow-moving landslides in the Three Gorges Reservoir (TGR) region of China are characterized by pre-existing shear surfaces. The large deformation within the shear zones usually gives rise to clastic soil formation. The creep properties have large influence on the kinematic feature of landslides. In this paper, we report an in-situ direct shear creep test carried out in the shear zone of a reactivated slow-moving landslide in the TGR region. Correspondingly, some laboratory ring shear creep tests are carried out to interpret the movement pattern of this landslide. The shear zone soil exhibits similar non-attenuating creep responses in both the in-situ direct shear and laboratory ring shear creep tests. At the same stress level, however, the in-situ direct shear creep test yields a larger rate of creep displacement due to shearing along the landslide direction. In the ring shear creep tests, at the prepeak stage, the critical creep stress that triggers creep failure is slightly lower than the peak shear strength but much larger than the residual strength; at the postfailure stage, the critical creep stress of the shear-zone soil is equal to the residual shear strength. The rate-dependent residual shear strength may account for the stepwise movement pattern of the landslide.

The Shear Creep Characteristics of a Green Schist Weak Structural Marble Surface

2012 ◽  
Vol 22 (9) ◽  
pp. 697-704 ◽  
Author(s):  
Qingzhao Zhang ◽  
Mingrong Shen ◽  
Wenqi Ding
Keyword(s):  
Shear Creep ◽  
Creep Characteristics ◽  
Marble Surface
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