scholarly journals Rock and soil slope protection using a high stiffness geocomposite mesh system

2013 ◽  
Author(s):  
David Cheer ◽  
Giorgio Giacchetti
Keyword(s):  
Soil Slope ◽  
High Stiffness ◽  
Rock And Soil

Isolation Mechanism and Method for Buried Segmental Pipeline under Earhquake-Induced Large Displacement

2011 ◽  
Vol 99-100 ◽  
pp. 410-413
Author(s):  
Ai Ping Tang ◽  
Ai Hua Wen ◽  
Li Hua Gai ◽  
Ru Hong Zhong
Keyword(s):  
Slope Failure ◽  
Soil Types ◽  
Response Analysis ◽  
Buried Pipeline ◽  
Soil Slope ◽  
Seismic Response Analysis ◽  
Ground Displacement ◽  
Isolation System ◽  
Reliable Isolation ◽  
Rock And Soil

This paper deals with an isolation design methods of buried segment pipeline for large ground displacement in earthquake. The buried pipeline is always damaged due to the strong shaking and earthquake-induced large or permant ground displacement and deformation (PGD), including liquefaction, rock and soil slope failure, fault and fissure. Based on the seismic response analysis for buried segment pipeline, the isolation mechanism and an equipment for resisting ground displacement trigged by liquefaction and fault is presented in this paper. Some related parameters to isolation system like stiffness and damp of isolator, soil types and its displacement, depth of pipeline, are discussed for developing a reliable isolation system fitting the buried segment pipeline.

Research on the Mechanism of Progressive Slope Evolution and its Failure Criterion

2013 ◽  
Vol 864-867 ◽  
pp. 765-770 ◽  
Author(s):  
Wei Shui Fei ◽  
Cong Ling Zhang ◽  
Zhi Qiang Wu
Keyword(s):  
Stress State ◽  
Failure Criterion ◽  
Slope Failure ◽  
Failure Process ◽  
Soil Slope ◽  
Unstable Failure ◽  
Total Failure ◽  
Slice Method ◽  
Rock And Soil ◽  
Sliding Zone

The unstable failure of rock and soil slope was a progressive evolution process from local failure to total failure. The no-uniformity of rock and soil materials and differences of boundary conditions caused the discrepancy of stress field, together with the elastic-plastic characteristics of the sliding zone which controls the progressive unstable failure process. In this paper, any point of slop sliding zone was taken for the research object. On basis of limit slice method, the mechanical condition of slice was considered as a plane strain problem. According to Mohr-Coulomb linear failure criterion the stress state of a point is obtained with selecting stress function to establish the mechanical criterion of progressive slope failure. The analysis of engineering example shows that the mechanical criterion is reasonable to estimate the state of progressive slope evolution.

Two-phase Seepage Analysis in Unsaturated Rock and Soil Slope during Rainfall

2010 ◽  
Author(s):  
X. L. Huang ◽  
J. Xiong ◽  
J. J. Liu ◽  
Liejin Guo ◽  
D. D. Joseph ◽  
...  
Keyword(s):  
Soil Slope ◽  
Two Phase ◽  
Seepage Analysis ◽  
Rock And Soil

Numerical Calculation of Micro-Plie in Slope Engineering

2014 ◽  
Vol 644-650 ◽  
pp. 5113-5120
Author(s):  
Xiao Song Tang ◽  
Jian Ping Xin ◽  
Ying Ren Zheng
Keyword(s):  
Shear Failure ◽  
Bending Moment ◽  
Soil Mass ◽  
Calculation Model ◽  
Plastic State ◽  
Soil Slope ◽  
Structural Element ◽  
Deformation And Failure ◽  
Pile Deformation ◽  
Rock And Soil

In order to conduct the numerical simulation of rock and soil slope strengthened by the micro-pile with reinforced bar, FEM strength reduction is combined with the program of FLAC which possesses the function of analyzing tensile and shear failure. The micro-pile is under plastic state due to its mechanic features. Solid element and ideal elastic-plastic constitutive model of Mohr-Coulomb are applied as the rock and soil mass and pile. The calculation model can work out the safety factor of slope, the dynamic changing process of pile deformation and failure, the failure mode of slope after strengthened by micro-pile. Then the structural element of pile is used to simulate piles, which can obtain the bending moment and shear force. The beam element is used to simulate the coupling beam. So the layout principle of inner force before the failure can be calculated.

The Effect on the Stress Distribution of the Slope for Rock and Soil Characteristics

2014 ◽  
Vol 1065-1069 ◽  
pp. 227-231
Author(s):  
Bao Long Zhang ◽  
Wen Fan
Keyword(s):  
Shear Strength ◽  
Stress Distribution ◽  
Soil Characteristics ◽  
Engineering Practice ◽  
Soil Slope ◽  
Shear Strength Parameters ◽  
Strength Parameters ◽  
Factors Affecting ◽  
Depth Analysis ◽  
Rock And Soil

Failure of slope generally sites along the slope of the stress concentration, while there are too many factors affecting stress distribution of slope, including the geometry of the slope, the strength parameters, the boundary conditions and constraints, etc. In this paper, considering the edge affect the elastic modulus of rock and soil slope, Poisson's ratio, shear strength parameters and other characteristics factors, by using finite element modeling to analyze the distribution forms of stress of the different slope, every factors affecting on the stress distribution of the different slope can be obtained. Through in-depth analysis, getting some understanding of regularity, it can be used to guide the engineering practice and has some promotional value.

scholarly journals Finite Element Analysis Method of Slope Stability based on Fuzzy Statistics

2021 ◽  
Vol 25 (1) ◽  
pp. 123-130
Author(s):  
Zhongjie Wang ◽  
Min Lin
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Slope Stability ◽  
Analysis Method ◽  
Soil Slope ◽  
Element Analysis ◽  
Finite Element Analysis Method ◽  
Fuzzy Statistics ◽  
The Stability ◽  
Rock And Soil

In order to reduce the risk of slope stability evaluation due to the fuzziness of calculation parameters, a finite element analysis method of slope stability based on fuzzy statistics is proposed. Based on the principle of quasi-static method and with the help of the finite element software COMSOL multiphysics, this paper studies the stability of the gravel soil accumulation rock slope under the action of different seismic acceleration. By analyzing the displacement, plastic zone and safety factor of the rock soil slope, the stability of the rock soil slope is analyzed. The research results show that the fuzziness of mechanical parameters of rock and soil slope will lead to the fuzziness of position displacement and stress analysis results of rock and soil slope, and the analysis of rock and soil slope with the method of fuzzy finite element analysis can strengthen the comprehensive understanding of position displacement, stress and safety of rock and soil slope by engineers and technicians, and reduce the stability of rock and soil slope due to the fuzziness of calculation parameters to a certain extent Evaluate the risk qualitatively.

Infrasound signal characteristics of rock soil landslide and experience with its engineering application

2020 ◽  
Author(s):  
Xiang Fu ◽  
Yuxin Ban ◽  
Qiang Xie ◽  
Chunbo He
Keyword(s):  
Slope Failure ◽  
Peak Frequency ◽  
Soil Mass ◽  
Landslide Monitoring ◽  
Soil Slope ◽  
Displacement Signal ◽  
Signal Characteristics ◽  
Mechanical Signal ◽  
Infrasound Signal ◽  
Rock And Soil

<p>As the infrasound signal has the advantages of slow energy attenuation, strong ability to cross obstacles and no need of contact acquisition, it is of great significance to take advantage of the infrasound signal in the process of deformation and failure of rock and soil mass to realize remote rapid monitoring and early warning of geological disasters. The infrasound signal characteristics of soil slope failure and rock under different stress states (compression, shear and tension) were compared by indoor and outdoor tests. The results showed that there was an obvious waveform of infrasound signal at the site of soil slope damage. The infrasound signal appeared mainly in elastic and plastic deformation stages under the compression state, the peak frequency of the infrasound signal was about 7 Hz. The concentration of signal power was slightly less than that under the compression state, and the peak frequency was about 8 Hz. The infrasound signal always associated with the whole loading process under tension state, and there were two bands of frequency center, in which the lower frequency was close to that of the compression test specimen, and the higher frequency was 3 Hz larger. On this basis, using the infrasound characteristics of rock and soil mass failure, the infrasound and other monitoring methods were carried out for Xinpu landslide in Fengjie, Chongqing, China. After the occurrence of the landslide, the infrasound signal characteristics of rock and soil failure were basically the same as those of indoor tests. The low-frequency signals were mainly monitored. At the same time, the monitoring results showed that the peak value of the infrasound signal reached before the mechanical signal, and the mechanical signal was monitored prior to the displacement signal. The infrasound signal can be 3-5 hours ahead of displacement signal. This regularity has important scientific and application value for landslide monitoring and prediction.</p>

NJZ ALLOY No. 55

Alloy Digest ◽  
1976 ◽  
Vol 25 (12) ◽  
Keyword(s):  
Tensile Strength ◽  
Corrosion Resistance ◽  
New Jersey ◽  
Physical Properties ◽  
Tensile Properties ◽  
Heat Treating ◽  
High Tensile Strength ◽  
High Stiffness ◽  
Zinc Cadmium ◽  
Forming Characteristics

Abstract NJZ Alloy No. 55 is a zinc-cadmium alloy characterized by high tensile strength and hardness but low ductility. It has high stiffness and resiliency but low drawing and forming characteristics. Its applications include hardware and medallions. This datasheet provides information on composition, physical properties, hardness, and tensile properties as well as creep and fatigue. It also includes information on corrosion resistance as well as casting, forming, heat treating, machining, and joining. Filing Code: Zn-30. Producer or source: New Jersey Zinc Company.

NJZ ALLOY No. 45

Alloy Digest ◽  
1976 ◽  
Vol 25 (1) ◽  
Keyword(s):  
Corrosion Resistance ◽  
New Jersey ◽  
Physical Properties ◽  
Tensile Properties ◽  
Copper Alloy ◽  
High Hardness ◽  
Heat Treating ◽  
Good Ductility ◽  
High Stiffness

Abstract NJZ Alloy No. 45 is a zinc-copper alloy characterized by high hardness and strength, good ductility and high stiffness. It work hardens easily. Among its many applications are hardware, sporting-equipment components, cable wrappings and watch cases. This datasheet provides information on composition, physical properties, hardness, and tensile properties as well as creep and fatigue. It also includes information on corrosion resistance as well as casting, forming, heat treating, machining, and joining. Filing Code: Zn-25. Producer or source: New Jersey Zinc Company.

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