scholarly journals Analysis of Vertical Response of Drilled Pile at the Crest of Rock Slope Based on Shear Behavior

Geofluids ◽  
2021 ◽  
Vol 2021 ◽  
pp. 1-12
Author(s):  
Chong Jiang ◽  
Ju Fang ◽  
Bowen Sun
Keyword(s):  
Analytical Solution ◽  
Rock Slope ◽  
Load Transfer ◽  
Rock Properties ◽  
Vertical Load ◽  
Modified Model ◽  
Difference Analysis ◽  
Side Resistance ◽  
Rock Interface ◽  
Shear Behaviors

This paper proposed a method for analysis of a drilled pile under vertical load at the crest of rock slope. Based on wedge theory, a modified model of normal stiffness of socket wall affected by the slope is obtained. Analyze the shear behaviors of the pile-rock interface, an analytical solution of load transfer of pile at the crest of rock slope is obtained. To evaluate the accuracy of the new method, this method is compared with the results of finite difference analysis. Finally, the method is used to analyze the effect of slope, pile, and rock properties on the unit side resistance and axial force.

An analytical solution for load transfer mechanism of XCC pile foundations

2015 ◽  
Vol 67 ◽  
pp. 223-228 ◽  
Author(s):  
Dongdong Zhang ◽  
Yaru Lv ◽  
Hanlong Liu ◽  
Mingyang Wang
Keyword(s):  
Analytical Solution ◽  
Load Transfer ◽  
Transfer Mechanism ◽  
Pile Foundations ◽  
Load Transfer Mechanism

scholarly journals Interannual variability of glacier basal pressure from a 20 year record

2015 ◽  
Vol 56 (70) ◽  
pp. 33-44 ◽  
Author(s):  
Pierre-Marie Lefeuvre ◽  
Miriam Jackson ◽  
Gaute Lappegard ◽  
Jon Ove Hagen
Keyword(s):  
Interannual Variability ◽  
Load Transfer ◽  
Pearson Correlation ◽  
Drainage System ◽  
Stress Redistribution ◽  
Basal Pressure ◽  
Load Cells ◽  
Glacier Ice ◽  
Cavity Opening ◽  
Rock Interface

AbstractBasal pressure has been recorded at the Svartisen Subglacial Laboratory, northern Norway, for 20 years, and is measured by load cells installed at the ice–rock interface under ~200m of glacier ice. Synchronous pressure variations between load cells are investigated as evidence of stress redistribution and hydrological bed connectivity. A running Pearson correlation is used to study the temporal variation in the response of several sensors. By studying the nature of this correlation as well as the correlation between sensor pairs, it is possible to investigate the evolution of the degree of synchronous response, and to some extent basal connectivity, at the glacier bed. Persistent seasonal variations associated with the melt season are observed throughout the measurement period, indicating dependence on surface hydrological forcing. Overlying this pattern, specific years with longer periods of positive and negative correlation of pressure between sensors are presented to show contrasting interannual variability in basal pressure. An anticorrelated connectivity is associated with a local increase in the rate of daily subglacial discharge, and is caused by load transfer or passive cavity opening. Stable weather appears to enhance connectivity of the sensors, which is attributed to the development of a persistent drainage system and stress redistribution.

Load Transfer Mechanism of Embankment Supported by Sparse Piles

2012 ◽  
Vol 178-181 ◽  
pp. 1396-1401
Author(s):  
Hao Zhang ◽  
Ming Lei Shi ◽  
Rui Kun Zhang ◽  
Yu Zhao
Keyword(s):  
Present Method ◽  
Stress Ratio ◽  
Load Transfer ◽  
Vertical Load ◽  
Transfer Property ◽  
Arching Effect ◽  
Load Transfer Mechanism ◽  
Soil Stress ◽  
Load Effects ◽  
Piled Embankment

The load transfer property of embankment fills, cushion, pile (or with cap) and foundation soils are complicated in a piled embankment. In this paper, the vertical load effects of pile and foundation soils at the bottom of embankment were analyzed with consideration of the interaction of each component. The arching effect of embankment fills and the pile-soil interaction were respectively formulated, and then, with continuous displacements and stresses at the bottom of embankment, a calculation method of pile-soil stress ratio was presented. In addition, the influence of the setting of cushion and geosynthetic was analyzed. The present method could definite the load sharing between pile and soil, and may be applied in the engineering design of embankment supported by spares piles.

Real-Time Detection of Adhesion Coefficient between Tire and Road

2012 ◽  
Vol 249-250 ◽  
pp. 109-112
Author(s):  
Kui Yang Wang ◽  
Jin Hua Tang ◽  
Guo Qing Li ◽  
Chuan Yi Yuan
Keyword(s):  
Load Transfer ◽  
Detection Method ◽  
Safety Performance ◽  
Vehicle Safety ◽  
Position Sensor ◽  
Vertical Load ◽  
Adhesion Coefficient ◽  
Vehicle Load ◽  
Motion State ◽  
Brake Force

Adhesion coefficient between tire and road is one of important factors which influence vehicle safety performance. On the basis of theoretical analysis, the detection method of adhesion coefficient based on brake-by-wire is put forward. Brake force is estimated according to pedal position sensor, vehicle braking deceleration is detected through MMA6260Q acceleration sensor. Motion state of tire is distinguished according to brake force and road braking force, vertical load of tire is received in view of formula on vehicle load transfer. Adhesion coefficient used for sliding area is got and taken as adhesion coefficient of road. Analysis shows that the detection method may identify adhesion coefficient between tire and road accurately, and has certain practical value.

Load transfer of fibre-reinforced polymer (FRP) composite tapered piles in dense sand

2004 ◽  
Vol 41 (1) ◽  
pp. 70-88 ◽  
Author(s):  
Mohammed Sakr ◽  
M Hesham El Naggar ◽  
Moncef Nehdi
Keyword(s):  
Analytical Solution ◽  
Load Transfer ◽  
Compressive Loading ◽  
Centrifuge Modeling ◽  
Rational Approach ◽  
Dense Sand ◽  
Reinforced Polymer ◽  
Cylindrical Piles ◽  
Confining Pressures ◽  
Fibre Reinforced Polymer

This paper describes an experimental study conducted using a large, laboratory-scale testing facility to test pile segments at different stress levels. The objectives of the study were twofold: to examine the load-transfer mechanism of tapered piles in compression, and to evaluate the effect of pile material on pile performance characteristics. The results of axial compressive loading tests on 26 pile load tests were presented using fibre-reinforced polymer (FRP) concrete composite tapered piles and steel piles. Two installation techniques were used, including conventional head driving and toe driving using a new technique. Piles were tested at different confining pressures to represent a pile segment at depths of 4.0 and 8.0 m. The load distribution along the pile shafts was measured and the results were compared with those from an analytical solution in terms of the taper coefficient Kt. The comparison showed reasonable agreement between Kt values established from the experiments and those obtained from the analytical solution. The measured toe resistance of tapered and cylindrical piles was compared with those from the analytical solution. A simple rational approach was proposed for the design of tapered piles.Key words: tapered piles, FRP, pile capacity, axial performance, centrifuge modeling, shaft resistance, toe resistance.

Theoretical Research on Ideal Brake Force Distribution of Tractor-Semitrailer Cornering Braking

2013 ◽  
Vol 467 ◽  
pp. 451-455
Author(s):  
Chen Li ◽  
Xing Hu Li ◽  
Wei Zhou ◽  
Wei Liang Dai
Keyword(s):  
Load Transfer ◽  
Lateral Acceleration ◽  
Theoretical Research ◽  
Force Distribution ◽  
Vertical Load ◽  
Traditional Design ◽  
Brake Force ◽  
Braking Control ◽  
Brake Force Distribution ◽  
The Ideal

For tractor-semitrailer, load transfer during cornering braking caused big difference of the vertical load between coaxial wheels. As a result, braking efficiency and directional stability were affected seriously, the traditional design of braking force distribution between axles couldnt meet the requirements. In this paper, a dynamic model of tractor-semitrailer was established according to the motion and force during cornering braking. The rule of vertical load changing of each wheel with longitudinal acceleration and lateral acceleration was obtained. Combining with the tire and road adhesion conditions, the ideal brake force distribution was achieved. The research could provide theoretical reference to better control strategy of tractor-semitrailer braking control system.

scholarly journals Analysis of Vertical Load Transfer Mechanism of Assembled Lattice Diaphragm Wall in Collapsible Loess Area

2021 ◽  
Vol 2021 ◽  
pp. 1-13
Author(s):  
Mingtan Xia ◽  
Xudong Zhang ◽  
Gengshe Yang ◽  
Liu Hui ◽  
Wanjun Ye
Keyword(s):  
Failure Modes ◽  
Load Transfer ◽  
Diaphragm Wall ◽  
Vertical Load ◽  
Soil System ◽  
Loess Area ◽  
Collapsible Loess ◽  
Negative Friction ◽  
Vertical Bearing ◽  
Soil Interface

Based on analysis of the formation mechanism and characteristics of the negative friction in collapsible loess areas, this study investigates the load transfer law of a wall-soil system under a vertical load, establishes the vertical bearing model of a lattice diaphragm wall, and analyzes the vertical bearing capacity of an assembled latticed diaphragm wall (ALDW) in a loess area. The factors influencing the vertical bearing characteristics of the ALDW in a loess area are analyzed. The vertical bearing mechanism of the lattice diaphragm wall in the loess area is investigated. The failure modes of the ALDW in the loess area are mainly shear failure of the soil around the wall and failure of the wall-soil interface. In the generation and development of negative friction, there is always a point where the relative displacement of the wall-soil interface is zero at a certain depth below the ground; at this point, the wall and soil are relative to each other. The collapsibility of loess, settlement of the wall and surrounding soil, and rate and method of immersion are the factors affecting the lattice diaphragm wall. The conclusions of this study provide a reference for the design and construction of ALDWs in loess areas.

Three-Dimensional Analysis of Excavating Face Stability Supported by Pipe Roof

2013 ◽  
Vol 275-277 ◽  
pp. 1257-1263 ◽  
Author(s):  
Xiang Yuan ◽  
Shun Hua Zhou ◽  
Quan Mei Gong
Keyword(s):  
Analytical Solution ◽  
Dimensional Analysis ◽  
Load Transfer ◽  
Three Dimensional ◽  
Subgrade Reaction ◽  
Large Section ◽  
Tunnel Face ◽  
Face Stability ◽  
Tunnel Face Stability ◽  
The Stability

This paper analyzes the load transfer characteristics of pipe roof over the excavating face, and the analytical solution of tunnel face stability is established by the method of three-dimensional analysis. Through the calculation of the load transfer of the pipe roof, it indicates that the released load of excavation is passed to the supporting structure and soil which is not excavated by the effect of the pipe roof, and the magnitude of load and coverage of impact are in connection with excavating footage as well as subgrade reaction. The three-dimensional analytical solution of tunnel face stability is used to analyze a project case of Airport Road underpass in Hangzhou. The results show that the tunnel face stability is not guaranteed when excavated on a large section while the stability is enhanced when excavated on separated pilot headings.

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