Study on Earth Pressure on the Top of Trapezoid Ditch-Buried Culverts

2011 ◽  
Vol 90-93 ◽  
pp. 707-713 ◽  
Author(s):  
Yong Gang Li ◽  
Shu Yan Xing ◽  
Lin Wei Feng
Keyword(s):  
Influencing Factors ◽  
Earth Pressure ◽  
Calculation Model ◽  
Pressure Increase ◽  
Earth Model ◽  
The Earth ◽  
Study Results ◽  
Vertical Earth Pressure

The vertical earth pressure on the top of ditch-buried culverts was analyzed theoretically under the condition of trapezoidal ditch and square culverts. A calculation model to evaluate the earth pressure on the top of the culverts based on Duncan earth model was established. The study results show that the height of plane of equal settlement decreases and turns to a constant gradually as the depth of soil overlying culverts increases. The primary influencing factors of earth pressure are the ditch width and the ratio of height to width of the culverts and the foundation. Each of them can make the coefficient of earth pressure increase or decrease more than 30%. When the width of the culverts become wider, ditch buried culverts turn to projecting buried culverts gradually, and the uniform calculation theory of earth pressure on the top of ditch-buried culverts and positive buried culverts is formed.

Influence of Culvert Structure Style and Boundary on Vertical Earth Pressure Distribution of High-Filled Culvert

2012 ◽  
Vol 193-194 ◽  
pp. 565-568
Author(s):  
He Fan ◽  
Jin Hua Xu ◽  
Zhuo Han
Keyword(s):  
Stress State ◽  
Earth Pressure ◽  
Highway Bridges ◽  
Structural Style ◽  
Construction Procedure ◽  
The Earth ◽  
Field Temperature ◽  
Vertical Earth Pressure ◽  
Actual Stress ◽  
Pressure Characteristics

The actual stress state of high filled culvert was not accurately reflected by the calculation method of earth pressure in the prevailing Chinese General Code for Design of Highway Bridges and Culverts. So the vertical earth pressure characteristics of different culvert structural style under fill-load were studied based on field temperature and FEM numerical analysis. Meanwhile, the key influencing factors, such as the height of culvert fill, and boundary condition on the earth pressure characteristics were also discussed. It is shown that the distributions of vertical earth pressure on the middle culvert top and culvert flank wall, as well as culvert side are all nonlinear, they are different from the results calculated by the code method under the high fill load. The influence of the factors on the stress state of high filled culvert should be comprehensively considered. The results can give some references on the design and construction procedure.

Research on Calculation Theory of Double-Row Piles Retaining Structure

2013 ◽  
Vol 671-674 ◽  
pp. 251-256
Author(s):  
Jing Cao ◽  
Kai Yu Jiang ◽  
Yue Gui ◽  
Hai Ming Liu
Keyword(s):  
Surface Morphology ◽  
Deformation Mechanism ◽  
Slip Surface ◽  
Earth Pressure ◽  
Calculation Model ◽  
Distribution Characteristics ◽  
Double Row ◽  
Retaining Structure ◽  
The Earth ◽  
Engineering Practices

The double-row piles retaining structure (DRPRS) is widely applied in the excavation engineering, but its calculation theory is immature and in appropriate. Based on the theory of earth pressure distribution, the distribution characteristics of earth pressure is analyzed to different layout form, and the general formula of earth pressure is derived. From the perspectives of the morphology of slip surface, linear slip surface morphology and broken-line slip surface morphology are proposed based on the feature of the DRPRS. A new calculation model is proposed combining the earth pressure and slip surface morphology. On this basis, one example is used to analyze the force and deformation mechanism of the DRPRS in detail. The research results can guide the engineering practices and promote the development of calculation theory for the DRPRS.

scholarly journals A Computational Method of Active Earth Pressure from Finite Soil Body

2018 ◽  
Vol 2018 ◽  
pp. 1-7 ◽  
Author(s):  
Yi Tang ◽  
Jiangong Chen
Keyword(s):  
Retaining Wall ◽  
Slope Angle ◽  
Earth Pressure ◽  
Calculation Model ◽  
Resultant Force ◽  
Computational Method ◽  
Active Earth Pressure ◽  
Linear Distribution ◽  
Application Point ◽  
The Earth

Nowadays, Coulomb and Rankine earth pressure theories have been widely applied to solve the earth pressure on a retaining structure. However, both of the theories established on the basis of the semi-infinite space assumption are not suitable for calculating the earth pressure from finite soil body. Therefore, this paper focuses on a theoretical study about the active earth pressure from finite soil body. Firstly, a common calculation model of finite soil body is established according to the results of previous studies. And then, based on Coulomb’s theory and the wedge element method, an analytical solution of the unit active earth pressure from finite soil body is deduced without an assumption of its linear distribution in advance. Meanwhile, formulas of the active earth pressure strength coefficient and the application point of the resultant force are also deduced. Finally, the influence of parameters such as the frictional angle between the retaining wall back and backfill, slope angle of backfill, dip angle of the retaining wall back, the frictional angle between backfill and rock slope, and uniformly applied load on the backfill surface on the distribution of the unit active earth pressure and the application point of the resultant force is analyzed in detail.

Study of Seismic Design Method for Slope Supporting Structure of Soil Nailing

2013 ◽  
Vol 353-356 ◽  
pp. 2073-2078
Author(s):  
Tian Zhong Ma ◽  
Yan Peng Zhu ◽  
Chun Jing Lai ◽  
De Ju Meng
Keyword(s):  
Seismic Design ◽  
Calculation Method ◽  
Retaining Wall ◽  
Earth Pressure ◽  
Calculation Model ◽  
Soil Nailing ◽  
Case Record ◽  
Analysis And Design ◽  
Supporting Structure ◽  
Earthquake Action

Slope anchorage structure of soil nail is a kind of economic and effective flexible slope supporting structure. This structure at present is widely used in China. The supporting structure belong to permanent slope anchorage structure, so the design must consider earthquake action. Its methods of dynamical analysis and seismic design can not be found for the time being. The seismic design theory and method of traditional rigidity retaining wall have not competent for this new type of flexible supporting structure analysis and design. Because the acceleration along the slope height has amplification effect under horizontal earthquake action, errors should be induced in calculating earthquake earth pressure using the constant acceleration along the slope height. Considering the linear change of the acceleration along the slope height and unstable soil with the fortification intensity the influence of the peak acceleration, the earthquake earth pressure calculation formula is deduced. The soil nailing slope anchorage structure seismic dynamic calculation model is established and the analytical solutions are obtained. The seismic design and calculation method are given. Finally this method is applied to a case record for illustration of its capability. The results show that soil nailing slope anchorage structure has good aseismic performance, the calculation method of soil nailing slope anchorage structure seismic design is simple, practical, effective. The calculation model provides theory basis for the soil nailing slope anchorage structure of seismic design. Key words: soil nailing; slope; earthquake action; seismic design;

Coordinated optimization control of shield machine based on dynamic fuzzy neural network direct inverse control

2020 ◽  
pp. 014233122098027
Author(s):  
Xuanyu Liu ◽  
Wentao Wang ◽  
Yudong Wang ◽  
Cheng Shao ◽  
Qiumei Cong
Keyword(s):  
Fuzzy Neural Network ◽  
Control Method ◽  
Earth Pressure ◽  
Screw Conveyor ◽  
Inverse Control ◽  
The Earth ◽  
Coordinated Optimization ◽  
Optimization Control ◽  
Fuzzy Neural ◽  
Shield Machine

During shield machine tunneling, the earth pressure in the sealed cabin must be kept balanced to ensure construction safety. As there is a strong nonlinear coupling relationship among the tunneling parameters, it is difficult to control the balance between the amount of soil entered and the amount discharged in the sealed cabin. So, the control effect of excavation face stability is poor. For this purpose, a coordinated optimization control method of shield machine based on dynamic fuzzy neural network (D-FNN) direct inverse control is proposed. The cutter head torque, advance speed, thrust, screw conveyor speed and earth pressure difference in the sealed cabin are selected as inputs, and the D-FNN control model of the control parameters is established, whose output are screw conveyor speed and advance speed at the next moment. The error reduction rate method is introduced to trim and identify the network structure to optimize the control model. On this basis, an optimal control system for earth pressure balance (EPB) of shield machine is established based on the direct inverse control method. The simulation results show that the method can optimize the control parameters coordinately according to the changes of the construction environment, effectively reduce the earth pressure fluctuations during shield tunneling, and can better control the stability of the excavation surface.

The earth pressure behind full-height integral abutments

2005 ◽  
Vol 90 (6) ◽  
pp. 55-58 ◽  
Author(s):  
Ming Xu ◽  
Alan G. Bloodworth
Keyword(s):  
Earth Pressure ◽  
The Earth ◽  
Integral Abutments ◽  
Full Height

Experimental Study on Earth Pressure of Corrugated Steel Culvert under High Fill Embankment

2013 ◽  
Vol 405-408 ◽  
pp. 1815-1819
Author(s):  
Wen Sheng Yu ◽  
Zhu Long Li ◽  
Xiao Ru Xie ◽  
Li Yuan Guo
Keyword(s):  
Mechanical Property ◽  
Experimental Study ◽  
Reinforced Concrete ◽  
Concrete Slab ◽  
Earth Pressure ◽  
Reinforced Concrete Slab ◽  
The Earth ◽  
Filling Height ◽  
Test Points ◽  
Better Than

To analyze the earth pressure of corrugated steel culvert under high fill embankment, a field test was taken and the change law was got with the filling height increasing, the force state when geotechnical grilles were laid on the top of corrugated steel culvert was compared to that of reinforced concrete slab culvert. Results show that the pressure on the top of corrugated steel culvert is smaller than that on the external in same level when test points are near to culvert, the values of test points above and below geotechnical grilles are close, and the pressure of corrugated steel culvert is smaller than that of reinforced concrete slab culvert when filling height is above 7.3 m. So analysis indicates corrugated steel culvert spreads the upper load better, the geotechnical grille can reduce the pressure effectively through earth pressure redistribution, and the mechanical property of corrugated steel culvert is better than reinforced concrete slab culvert under high fill embankment.

Predicting the Earth Pressure on Integral Bridge Abutments

2012 ◽  
Vol 17 (2) ◽  
pp. 371-381 ◽  
Author(s):  
Alan G. Bloodworth ◽  
Ming Xu ◽  
James R. Banks ◽  
Chris R. I. Clayton
Keyword(s):  
Earth Pressure ◽  
Bridge Abutments ◽  
Integral Bridge ◽  
The Earth
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