Model Test Investigation on Rectangular Section Composite Micro-Pile Structure for Earth Slope Reinforcement

2010 ◽  
Vol 163-167 ◽  
pp. 2256-2261 ◽  
Author(s):  
Xiao Li Liu ◽  
Dan Dan Zhang ◽  
Kai Liu
Keyword(s):  
Model Test ◽  
Slip Surface ◽  
Earth Pressure ◽  
Relative Deformation ◽  
Rectangular Section ◽  
Slope Reinforcement ◽  
Deformation Properties ◽  
Earth Slope ◽  
Test Investigation ◽  
Bending Failure

Model test investigation on rectangular section composite micro-pile structure used for earth slope reinforcement has been performed, including the mechanical and deformation properties and pile spacing influence on anti-sliding capacity. Test results have shown the main following conclusions. For the rectangular section composite micro-pile structure and the similar soil in tests, micro-pile row spacing along the lateral load direction ranging from 4D to 6D (D is the diameter of micro-pile) can provide higher anti-sliding capacity. Active earth pressure of the first row pile is larger than that of other piles when the anti-sliding potential of composite micro-pile structure is fully developed. Relative deformation of the first row pile is larger than that of the middle and last row piles above the slip surface, while relative deformation of the last row pile is larger than that of other piles beneath the slip surface. The main failure mode of the rectangular section composite micro-pile structure can be regarded as bending failure in certain range near the slip surface.

scholarly journals Centrifuge Model Test for Evaluation of Earth Pressure Acting on Adjacent Shield Tunnels with Rectangular Section.

1999 ◽  
pp. 167-178 ◽  
Author(s):  
Haruo TAKANO ◽  
Tohru KONDA ◽  
Masafumi OGASAWARA ◽  
Kouji FUNAMOTO ◽  
Yoshifumi FUJII ◽  
...  
Keyword(s):  
Model Test ◽  
Earth Pressure ◽  
Centrifuge Model Test ◽  
Rectangular Section ◽  
Centrifuge Model

scholarly journals Model test investigation of a spar floating wind turbine

2016 ◽  
Vol 49 ◽  
pp. 76-96 ◽  
Author(s):  
Fei Duan ◽  
Zhiqiang Hu ◽  
J.M. Niedzwecki
Keyword(s):  
Wind Turbine ◽  
Model Test ◽  
Floating Wind Turbine ◽  
Test Investigation

Large scale model test investigation on wave run-up in irregular waves at slender piles

2013 ◽  
Vol 72 ◽  
pp. 69-79 ◽  
Author(s):  
J. Ramirez ◽  
P. Frigaard ◽  
T. Lykke Andersen ◽  
L. de Vos
Keyword(s):  
Model Test ◽  
Large Scale ◽  
Irregular Waves ◽  
Scale Model ◽  
Large Scale Model ◽  
Test Investigation ◽  
Run Up

Upper Bound Limit Analysis of Passive Earth Pressure of Cohesive Backfill on Retaining Wall

2013 ◽  
Vol 353-356 ◽  
pp. 895-900 ◽  
Author(s):  
Xin Rong Liu ◽  
Ming Xi Ou ◽  
Xin Yang
Keyword(s):  
Upper Bound ◽  
Limit Analysis ◽  
Slip Surface ◽  
Retaining Wall ◽  
Earth Pressure ◽  
Friction Angle ◽  
Cohesive Soil ◽  
Passive Earth Pressure ◽  
Simple Method ◽  
Upper Bound Limit Analysis

In view of the shortage of using classical earth pressure theories to calculating passive earth pressure of cohesive soil on retaining wall under complex conditions. Based on the planar slip surface and the back of retaining wall was inclined and rough assumption, the calculation model of passive earth pressure of cohesive backfill under uniformly distrubuted loads was presented, in which the upper bound limit analysis was adopted. Meanwhile it was proven that the prevailing classical Rankine’s earth pressure theory was a special example simlified under the condition of its assumptions. For it’s difficult to determine the angle of slip surface , a relatively simple method for calculating the angle was proposed by example. And the influence of angle of wall back , friction angle of the interface between soil and retaining wall, cohesion force and internal friction angle of backfill soil to planar sliding surface and passive earth pressure were analyzed. Some good calculation results were achieved, these analysis can provide useful reference for the design of retaining wall.

A Simplified Analysis Method for the Validity of Pipeline Rock Armour Berm Protection Design

2012 ◽  
Vol 594-597 ◽  
pp. 1888-1891 ◽  
Author(s):  
Wen Bin Liu ◽  
Run Liu ◽  
Guo Min Sun ◽  
Shu Wang Yan
Keyword(s):  
Model Test ◽  
Earth Pressure ◽  
Centrifuge Test ◽  
Test Results ◽  
Analysis Method ◽  
Simplified Method ◽  
Simplified Analysis ◽  
Potential Damage ◽  
Seabed Soil

Submarine pipelines located near harbour areas and in major shipping lanes are likely to be exposed to potential damage due to anchors and dropped object impact. To protect these pipelines, they are buried and protected with rock armour berms. The design of these rock berms has been traditionally based on model test results. In this paper, a simplified method is proposed to simulate the interaction between the anchor, seabed soil and rock armour, on the basis of the thrust earth pressure theory. The results agree well with the centrifuge test results.

scholarly journals Correction of Earth Pressure and Analysis of Deformation for Double-Row Piles in Foundation Excavation in Changchun of China

2016 ◽  
Vol 2016 ◽  
pp. 1-10 ◽  
Author(s):  
Yijun Zhou ◽  
Aijun Yao ◽  
Haobo Li ◽  
Xuan Zheng
Keyword(s):  
Physical Model ◽  
Model Test ◽  
Large Scale ◽  
Similarity Theory ◽  
Earth Pressure ◽  
Physical Model Test ◽  
Deep Foundation ◽  
Foundation Pit ◽  
Double Row ◽  
The Earth

In order to study the earth pressure and the deformation behavior of the double-row piles in foundation excavation, a large-scale physical model test was introduced to simulate deformation of double-row piles in foundation excavation based on the principle of similarity theory in this paper. Represented by the deep foundation pit engineering of Changchun, the strain and the displacement of the double-row piles and the earth pressure are calculated by the above-mentioned physical model test. Then a numerical simulation has been carried out to validate practicability of the physical model test. The results show that the strain and the displacement of the front-row piles are larger than the back-row piles. The earth pressure of the front-row piles appears to be “right convex,” correcting the specification of the earth pressure and putting forward the coefficient of β. The results in this paper may provide constructive reference for practical engineering.

Development of New-Type Similar Materials of Geomechanics Models Test for Geotechnical Engineering

2006 ◽  
Vol 326-328 ◽  
pp. 1781-1784
Author(s):  
Qiang Yong Zhang ◽  
Wei Shen Zhu ◽  
Yong Li ◽  
X.H. Guo
Keyword(s):  
Model Test ◽  
Quartz Sand ◽  
Iron Ore ◽  
Geotechnical Engineering ◽  
High Volume ◽  
Alcohol Solution ◽  
Volume Weight ◽  
Deformation Properties ◽  
Similar Materials ◽  
New Type

Geomechanics model test can simulate the real excavation process of geotechnical engineering and the mechanics deformation properties of the rockmass prototype on the condition of meeting the similar principles. In order to conducting geomechanics model test, similar material which can meet similar mechanical properties must be used. It is only after conducting a massive mechanics experiments that a new-type similar materials called iron crystal sand is developed in this paper. This material consists of iron ore powder, blanc fix, quartz sand, gypsum powder and rosin alcohol solution which are evenly mixed in certain proportion and pressed together. The iron ore powder, blanc fix and quartz sand among them are main materials. The rosin alcohol solution is the cementing agent and gypsum powder the regulator. The material mechanics experiments show that this material has following outstanding characteristics: high volume-weight, wide variable mechanical parameters, stable performance, low price, quick drying, simple processing and innocuity. It can simulate most rockmass material from soft to hard ones and can be widely used in geomechanics model tests in fields of energy sources, transportation, water conservancy and mining.

Physical and numerical tests of the excavation walls in jointed rock masses

2014 ◽  
Vol 51 (5) ◽  
pp. 554-569 ◽  
Author(s):  
Moorak Son ◽  
Jaehyun Park
Keyword(s):  
Physical Model ◽  
Model Test ◽  
Earth Pressure ◽  
Jointed Rock ◽  
Physical Model Test ◽  
Rock Masses ◽  
Jointed Rock Masses ◽  
Rock Types ◽  
Joint Characteristics ◽  
Parametric Studies

This paper examines the magnitude and distribution of earth pressure on the support systems of open cuts in jointed rock masses. A physical model test was carried out using concrete blocks with man-made joints to represent a jointed rock mass. The model test was simulated numerically to provide a justifiable basis for extended numerical parametric studies. This study focused on the overall procedures of the physical model test, its numerical simulation, and extended numerical parametric studies. A comparison of the results from both the physical model test and numerical simulation confirmed that the applied numerical approach and methodology were suitable for further extended numerical parametric studies. The controlled parameters were the different rock types and joint characteristics including joint shear condition, joint spacing, and joint inclination angle. Results of the earth pressures from the numerical parametric tests in jointed rock masses were compared with Peck’s empirical earth pressure for soil ground. The comparison showed that the earth pressure in jointed rock masses can be very different from that in the soil ground. Accordingly, the effect of the rock types and joint characteristics needs to be considered when designing excavation support systems in jointed rock masses.

scholarly journals Progressive failure of a constrained creeping landslide

2011 ◽  
Vol 467 (2133) ◽  
pp. 2444-2461 ◽  
Author(s):  
Alexander M. Puzrin ◽  
Andreas Schmid
Keyword(s):  
Slip Surface ◽  
Pore Water Pressure ◽  
Progressive Failure ◽  
Water Pressure ◽  
Field Tests ◽  
Warning System ◽  
Earth Pressure ◽  
Compression Zone ◽  
Slowing Down ◽  
In The Beginning

The ski resort town of St Moritz, Switzerland, is partially constructed on a large creeping landslide, which has been causing damage to buildings and infrastructure. At the town centre, the landslide is constrained by a rock outcrop, creating a compression zone in the sliding mass. After decades of gradual slowing down,s in the beginning of 1990s the landslide started to accelerate, in spite of the fact that the average yearly precipitation and the pore water pressure on the sliding surface remained fairly constant. The paper shows that a constrained creeping landslide experiences progressive failure caused by the propagation of a zone of intense shearing along the slip surface resulting in significant earth pressure increase and visco-plastic yielding of soil in the compression zone. This basic physical mechanism, relying on extensive laboratory and field tests and long-term displacement monitoring, explains the paradox of the St Moritz landslide acceleration. Although the model predicts that the landslide could eventually slow down, its displacements may become excessive for some buildings, requiring an early warning system and further stabilization of the historic Leaning Tower. In general, by predicting the onset of yielding, the model can provide an important timeframe for stabilization of constrained landslides.

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