An analytical method to estimate failure plane angle and tension crack depth for use in riverbank stability analyses

Geomorphology ◽  
2010 ◽  
Vol 123 (1-2) ◽  
pp. 74-83 ◽  
Author(s):  
M. Taghavi ◽  
M.H. Dovoudi ◽  
E. Amiri-Tokaldany ◽  
S.E. Darby
Keyword(s):  
Analytical Method ◽  
Crack Depth ◽  
Plane Angle ◽  
Failure Plane ◽  
Tension Crack ◽  
Stability Analyses ◽  
Riverbank Stability

Limit equilibrium theory-based investigation on the critical tension crack depth in loess slope

2021 ◽  
Vol 80 (9) ◽  
Author(s):  
Linxuan Zhu ◽  
Zhijun Zhou ◽  
Lei Chen ◽  
Tianyu Xu ◽  
Zhipeng Zhang ◽  
...  
Keyword(s):  
Limit Equilibrium ◽  
Crack Depth ◽  
Equilibrium Theory ◽  
Tension Crack ◽  
Limit Equilibrium Theory ◽  
Loess Slope ◽  
Critical Tension

Early-Age Concrete Cover Crack and Its Effects on Concrete Cover

2006 ◽  
Vol 302-303 ◽  
pp. 630-636 ◽  
Author(s):  
Xin Min Huang ◽  
Cheng Yong Yang
Keyword(s):  
Boundary Element Method ◽  
Boundary Element ◽  
Analytical Method ◽  
Crack Depth ◽  
Concrete Cover ◽  
Propagation Mechanism ◽  
Early Age ◽  
Minimum Thickness ◽  
Dual Boundary Element Method ◽  
Early Age Concrete

The influence of early-age crack on concrete cover was studied in this paper. Cracks in concrete increase the permeability of concrete, the section where cracking occurs should be treated as getting thinner. The formation and propagation mechanism of the early-age cover crack, and cover crack depth were two main topics, which were discussed mainly based on the dual boundary element method. At last, the ultimate analytical method was used to determine the minimum thickness of concrete cover.

scholarly journals An Optimization of the Analytical Method for Determining the Flexural Toppling Failure Plane

2020 ◽  
Vol 2020 ◽  
pp. 1-12
Author(s):  
Xin Qu ◽  
Fangfang Diao
Keyword(s):  
Analytical Method ◽  
Rock Slope ◽  
Beam Model ◽  
Failure Plane ◽  
Plane Normal ◽  
Toppling Failure ◽  
Flexural Toppling ◽  
Dip Angle ◽  
The Stability ◽  
Flexural Toppling Failure

According to the results of the physical model tests, the failure plane of an anaclinal layered rock slope was a linear-type plane at an angle above the plane normal to the discontinuities, and the failure mode of rock strata was bending tension. However, the shear failure occurred near the slope toe, the effects of the cohesion of the discontinuities on the stability of the slope, and the contribution of tangential force to cross-section axial force were neglected in such studies. Moreover, none of the experts had developed a rigorously theoretical method for determining the angle between the failure plane and the plane normal to the discontinuities. This paper was initiated for the purpose of solving the problems described above. With the cantilever beam model and a step-by-step analytical method, an optimization of the analytical method for determining the flexural toppling failure plane based on the limit equilibrium theory was developed and the corresponding formulations were derived. Based on the present computational framework, comparisons with other studies were carried out by taking a slate slope in South Anhui in China and a rock slope facing the Tehran-Chalus Road near the Amir-Kabir Dam Lake in Iran. Furthermore, the sensitivity analyses of the parameters used in the calculation process of the failure angle of the slate slope in South Anhui in China were performed. The results demonstrated that the failure plane and the safety factor of the stability obtained with the presented method were credible, which verified the proposed method. The dip angle of the slope, the dip angle of the rock stratum, and the friction angle of the discontinuities were the controlling factors for the overall failure of the slate slope in South Anhui in China.

scholarly journals Impact of Crack on Stability of Slope with Linearly Increasing Undrained Strength

2018 ◽  
Vol 2018 ◽  
pp. 1-11 ◽  
Author(s):  
Bing Li ◽  
Fei Zhang ◽  
Di Wang
Keyword(s):  
Slip Surface ◽  
Limit Equilibrium ◽  
Crack Depth ◽  
Seismic Effect ◽  
Tension Crack ◽  
Closed Form Solutions ◽  
Stability Of Slope ◽  
Undrained Strength ◽  
The Stability ◽  
The Impact

This paper presents a procedure for assessment of the impact of tension crack on stability of slope in clays with linearly increasing undrained strength. The procedure is based on the limit equilibrium method with variational extremization. The distribution of the normal stress over slip surface is mathematically obtained for slopes in clays with the linearly increasing undrained strength and then used to determine the tension crack for clays with zero tensile strength. The seismic effect is also included using the pseudostatic approach. Closed-form solutions to the minimum safety factor and the maximum crack depth can be derived and given in the form of chart for convenient use. The results demonstrate a significant effect of the tension crack on the stability of steep slopes, especially for strong seismic conditions. In this situation, neglecting the impact of tension crack in traditional ϕ=0 analyses may overestimate the slope safety. The most adverse location of the tension crack can be also determined and presented in the charts, which may be useful in designing reinforcements and remedial measures for slope stabilization.

Critical tension crack depth in rockslides that conform to the three-section mechanism

Landslides ◽  
2020 ◽  
Author(s):  
Guoqing Chen ◽  
Peng Tang ◽  
Runqiu Huang ◽  
Dong Wang ◽  
Zhiheng Lin ◽  
...  
Keyword(s):  
Crack Depth ◽  
Tension Crack ◽  
Critical Tension

Densitometric Identification of Primitive Erythroblasts After Reaction With Diaminobenzidine

1973 ◽  
Vol 31 ◽  
pp. 328-329
Author(s):  
John A. Trotter
Keyword(s):  
Red Blood Cells ◽  
Analytical Method ◽  
Blood Cells ◽  
Guinea Pigs ◽  
Specific Protein ◽  
Visual Examination ◽  
Hemoglobin Synthesis ◽  
Peroxidatic Activity ◽  
Small Density

Hemoglobin is the specific protein of red blood cells. Those cells in which hemoglobin synthesis is initiated are the earliest cells that can presently be considered to be committed to erythropoiesis. In order to identify such early cells electron microscopically, we have made use of the peroxidatic activity of hemoglobin by reacting the marrow of erythropoietically stimulated guinea pigs with diaminobenzidine (DAB). The reaction product appeared as a diffuse and amorphous electron opacity throughout the cytoplasm of reactive cells. The detection of small density increases of such a diffuse nature required an analytical method more sensitive and reliable than the visual examination of micrographs. A procedure was therefore devised for the evaluation of micrographs (negatives) with a densitometer (Weston Photographic Analyzer).

Bulk standards for low-temperature biological x-ray microanalysis

1984 ◽  
Vol 42 ◽  
pp. 282-283
Author(s):  
P. Echlin ◽  
M. McKoon ◽  
E.S. Taylor ◽  
C.E. Thomas ◽  
K.L. Maloney ◽  
...  
Keyword(s):  
Phase Separation ◽  
Low Temperature ◽  
Analytical Method ◽  
Salt Solutions ◽  
Absolute Concentration ◽  
Cooling Process ◽  
X Ray ◽  
The Absolute ◽  
Analytical Procedures ◽  
Electrical Conductors

Although sections of frozen salt solutions have been used as standards for x-ray microanalysis, such solutions are less useful when analysed in the bulk form. They are poor thermal and electrical conductors and severe phase separation occurs during the cooling process. Following a suggestion by Whitecross et al we have made up a series of salt solutions containing a small amount of graphite to improve the sample conductivity. In addition, we have incorporated a polymer to ensure the formation of microcrystalline ice and a consequent homogenity of salt dispersion within the frozen matrix. The mixtures have been used to standardize the analytical procedures applied to frozen hydrated bulk specimens based on the peak/background analytical method and to measure the absolute concentration of elements in developing roots.

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