scholarly journals Analysis of Soil Pressure in Indoor Model Test of H-Typed Prestressed Concrete Bank Protection Pile

2021 ◽  
Author(s):  
Song Zheng
Keyword(s):  
Prestressed Concrete ◽  
Earth Pressure ◽  
Bending Moment ◽  
Test Results ◽  
Sheet Pile ◽  
Soil Pressure ◽  
Scaled Model ◽  
Concrete Piles ◽  
Pressure Calculation ◽  
Different Depths

In order to explore the distribution of soil pressure on the side of the pile and the bending moment of the pile body during the excavation and pile loading stages of the H-shaped prestressed concrete piles, three groups of indoor scaled model tests with prestressed rectangular piles and with or without prestressed H-shaped piles were carried out, and the test results shows that the lateral earth pressure on both sides of the sheet pile has the same trend as the static earth pressure calculation value when it is not excavated, but the measured earth pressure at different depths is always lower than the static earth pressure calculation value; in the excavation stage, the H-shaped prestressed pile lateral soil pressure on the side of the pile excavation is less than that of the rectangular sheet pile and the unprestressed H-typed pile.

Study on Soil Pressure of High Fill Retaining Wall in Construction Stage

2012 ◽  
Vol 204-208 ◽  
pp. 718-721 ◽  
Author(s):  
Peng Li ◽  
Xiao Song
Keyword(s):  
Retaining Wall ◽  
Earth Pressure ◽  
Monitoring Data ◽  
Experiment Study ◽  
Pressure Monitoring ◽  
Soil Pressure ◽  
Construction Stage ◽  
The Earth ◽  
Pressure Calculation ◽  
Practical Guidance

The traditional formula using for the calculation of Expressway on high embankment of the retaining wall and the earth pressure can not be very good practical. In order to accurately determine the soil pressure calculation of the complex retaining wall in construction stage for guaranteeing the engineering safety, the experiment study on soil pressure is done, and the study on soil pressure monitoring data is also done. Then the valuable conclusions are obtained to facilitate better practical guidance for construction.

Study on Vertical Earth Pressure of Slab Culvert under High Embankment

2012 ◽  
Vol 256-259 ◽  
pp. 1898-1902 ◽  
Author(s):  
Bao Kuan Ning ◽  
He Fan ◽  
Lei Gong ◽  
Guo Qing Liu
Keyword(s):  
Numerical Simulation ◽  
Boundary Conditions ◽  
Field Test ◽  
Structural Design ◽  
Earth Pressure ◽  
Test Results ◽  
Soil Pressure ◽  
Vertical Earth Pressure ◽  
The Impact ◽  
Good Agreement

With the increasing of embankment culvert engineering applications, there has been due in part to the structural design is too conservative and not economic or select unreasonable structural form, leading to the phenomenon of cracking or even collapse of the culvert structure, and the phenomenon has seriously affected the normal use of the highway. In this paper, the numerical simulation of vertical earth pressure distribution on different structural forms of embankment on culverts, to discuss the impact of boundary conditions, fill height, the thickness of the culvert culverts vertical earth pressure. Combined with Heda highway a culvert covert field test results and numerical simulation results were compared and analyzed. The results show that the numerical simulation and field test results in good agreement with the culvert structure in the form of vertical earth pressure of the embankment culverts have a greater impact; the structure of different forms of the culvert in the upper soil pressure is significantly different. In addition, analysis of the impact of boundary conditions, filling height of culvert vertical earth pressure values. The results can reference for the study of the structural design of the embankment culverts security.

scholarly journals Design of Free Cantilever, Counter fort and T-flanged Cantilever Type Retaining Wall

2019 ◽  
Vol 8 (6) ◽  
pp. 3875-3877
Keyword(s):  
Retaining Wall ◽  
Water Storage ◽  
Earth Pressure ◽  
Bending Moment ◽  
Retaining Walls ◽  
Project Work ◽  
Passive Earth Pressure ◽  
Soil Pressure ◽  
Steel Bars ◽  
Wing Walls

Retaining walls are widely used as permanent structures for retaining soils at different levels.Type of the wall depends on the soil pressure, such as active or passive earth pressure and earth pressure at rest and drainage conditions. Types of walls generally used are gravity walls, RCC walls, counterfort walls and buttress retaining walls. Retaining walls behavior depends on the wall height and retention heights of the soil at its backfill. Retaining walls are used with tying with more than one wall at perpendicular joints to retain liquids, water storage and materials storages such as dyke walls and tanks. Retaining walls excessively used in culverts and as well as in the bridges for construction of abutment wing walls supposed to resist soil pressures laterally applied perpendicular to the axis of the walls.Based on the present scenario used in retaining structures within the civil industries there requirements of height of walls are being increased due to lake of land and cost of sub structures being incurred in the project work, higher height of walls develops huge bending moment at the base because of the cantilever action of the walls, thus resulting in higher sections at the base which deploys into a uneconomical zone so different wall systems are required in different arrangements so as to transfer the loads with limited sections. In the present study retaining walls of height 6m, 9m and 12m are considered for study and the length of the walls considered as 30m and the material properties considered are M20 and Fe415 steel bars and the supports considered to be fixed at the base

Numerical Analysis of Soil Pressure inside the Sunken Large Diameter Cylindrical Structure Based on ABAQUS

2013 ◽  
Vol 353-356 ◽  
pp. 392-397 ◽  
Author(s):  
Jin Song Gui ◽  
Bo Zhang ◽  
Zhi Qi Gao ◽  
Yu Fu
Keyword(s):  
Experimental Data ◽  
Finite Element ◽  
Large Scale ◽  
Large Diameter ◽  
Earth Pressure ◽  
Pressure Change ◽  
Soil Pressure ◽  
Cylindrical Structure ◽  
Finite Element Software ◽  
Pressure Calculation

The filling earth pressure calculation inside the Sunken Large Diameter Cylindrical Structure is very complex. This paper used large-scale finite element software ABAQUS to establish numerical model, and validated it by the experimental data, then analyze the main cause of earth pressure change inside the cylinder.

Study on Active Earth Pressure of Sheet Pile Model Test on Foundation Pit Engineering

2014 ◽  
Vol 1049-1050 ◽  
pp. 209-212 ◽  
Author(s):  
Xiong Xia ◽  
Yi Bo Wang ◽  
Han Dong Xu ◽  
Sai Ying Xi ◽  
Yi Huang
Keyword(s):  
Model Test ◽  
Soil Mechanics ◽  
Earth Pressure ◽  
Active Earth Pressure ◽  
Sheet Pile ◽  
Soil Pressure ◽  
Deep Foundation ◽  
Foundation Pit ◽  
Common Effect ◽  
Pile Model

In recent years, building density in the city is increasing as the promoting of urban modernization. Deep foundation pit excavation and bracing is a topic in geotechnical engineering, including strength and stabilization of soil mechanics, and transmutation and sedimentation of deep foundation, and common effect between soil and shoring structure. The paper based on the design and fabrication of indoor model test device. This paper respectively explored the destroy mechanism of cantilever and anchored sheet pile support structure on the soil pressure under the different loads, and comprehensively carried through cantilever and anchored sheet pile support test under four-grades excavation depth and four-grades load combination, and specially researched the transformation of soil pressure. At the same time, the piles spacing changed among 3cm, 4cm and 5cm. Theoretical results showed that the active earth pressure increased with the increase of load and excavation depth. Model test results showed that the earth pressure behind the piles increased with the increase of excavation depth and the load. The biggest earth pressure was 19.38kPa when loading 40kPa. The changing curves of soil pressure were similar when piles spacing was 3cm and 4cm. Earth pressure after the piles was negative when piles spacing exceeded 4cm, which illustrated that active earth pressure had changed into passive soil pressure.

scholarly journals Experiment on Interaction of Abutment, Steel H-Pile and Soil in Integral Abutment Jointless Bridges (IAJBs) under Low-Cycle Pseudo-Static Displacement Loads

2020 ◽  
Vol 10 (4) ◽  
pp. 1358 ◽  
Author(s):  
Fuyun Huang ◽  
Yulin Shan ◽  
Guodong Chen ◽  
Youwei Lin ◽  
Habib Tabatabai ◽  
...  
Keyword(s):  
Time History ◽  
Earth Pressure ◽  
Traditional Theory ◽  
Test Results ◽  
Integral Abutment ◽  
Horizontal Deformation ◽  
Soil Pressure ◽  
Significant Difference ◽  
Jointless Bridges ◽  
Pile Interaction

Soil-abutment or soil-pile interactions under cyclic static loads have been widely studied in integral abutment jointless bridges (IAJBs). However, the IAJB has the combinational interaction of soil-abutment and soil-pile, and the soil-abutment-pile interaction is lack of comprehensively study. Therefore, a reciprocating low-cycle pseudo-static test was carried out under an cyclic horizontal displacement load (DL) to gain insight into the mechanical behavior of the soil-abutment-pile system. Test results indicate that the earth pressure of backfill behind abutment has the ratcheting effect, which induced a large earth pressure. The soil-abutment-pile system has a favorable energy dissipation capacity and seismic behavior with relatively large equivalent viscous damping. The accumulative horizontal deformation in pile will be occurred by the effect of abutment and unbalance soil pressure of backfill. The test shows that the maximum horizontal deformation of pile occurs in the pile depth of 1.0b~3.0b of pile body rather than at the pile head due to the accumulative deformation of pile, which is significantly different from those of previous test results of soil-pile interaction. The time-history curve for abutment is relatively symmetrical and its accumulative deformation is small. However, the time-history curve of pile is asymmetrical and its accumulative deformation is dramatically large. The traditional theory of deformation applies only to the calculation of noncumulative deformation of pile, and the influence of accumulative deformation should be considered in practical engineering. A significant difference of inclinations in the positive and negative directions increases when the displacement load is relatively large. The rotation of abutment when bridge expands is larger than that when bridge contracts due to earth pressure of backfill.

scholarly journals Optimization and Mechanical Characteristics of Spatial Arc Antislide Pile

2021 ◽  
Vol 2021 ◽  
pp. 1-18
Author(s):  
You-Sheng Deng ◽  
Cheng-Pu Peng ◽  
Jun-Cong Liu ◽  
Ling-Tao Li ◽  
Yun-Bo Fu
Keyword(s):  
Stress State ◽  
Mechanical Characteristics ◽  
Earth Pressure ◽  
Bending Moment ◽  
Test Results ◽  
Safety Factors ◽  
Supporting Structure ◽  
The Earth ◽  
Practical Engineering ◽  
Simulation Results

To improve the stress state of traditional antislide pile and utilize the stable soil on both sides of a landslide and slope foot, a spatial arc antislide pile supporting structure was proposed. Based on numerical calculation, a parametric study was conducted to assess the influence of the rise-span ratio on the stress state of the supporting structure, the displacement of the pile top, and the earth pressure in the front of the pile. The optimal rise-span ratio was 3-16 according to the numerical simulation results. An indoor model test at the optimal rise-span ratio was carried out, recording the pile strain and the earth pressure in front of the pile. The results showed that some indices increased with the increase in rise-span ratio, such as the load transferred to the pile at the arch foot, the bending moment of the piles, the displacement of the pile top, and the earth pressure; within a certain depth near the pile top, the soil in front of the pile is loose during the loading processes, and the earth pressure at the range was zero. The overall safety factors of the four supporting models were 2.42, 2.66, 2.78, and 2.84, respectively, which can satisfy the requirements for practical engineering. The test results verify the feasibility and rationality of the spatial arc antislide pile supporting structure, which can provide a new idea for landslide treatment.

Calculation of Earth Pressure on Straight Ditch Buried Rigid Pipe

2013 ◽  
Vol 438-439 ◽  
pp. 824-828
Author(s):  
Qing Liu ◽  
Wei Ding ◽  
Jian Bo Cui ◽  
Yan Xiao ◽  
Xue Qiang Zhao
Keyword(s):  
Shear Strength ◽  
Optimization Design ◽  
Earth Pressure ◽  
Calculation Model ◽  
Intermediate Principal Stress ◽  
Strength Theory ◽  
Soil Pressure ◽  
Top Soil ◽  
Pressure Calculation ◽  
New Formula

Based on the unified twin shear strength theory, a new earth pressure formula is deduced for the straight groove buried rigid pipes, with a straight slip plane soil pressure calculation model established. Compared with traditional earth pressure calculation method, the new formula which considers influence of intermediate principal stress on the pipeline earth pressure can obtain the result which is much closer to the actual pipeline stress situation. The results determined from the proposed formula with an engineering example show the influence law of slot width and the thickness of the overburden on tube top soil pressure. The conclusions have some guidance significance for optimization design of pipeline engineering.

Prestressed high-strength concrete beams under torsion and bending

1999 ◽  
Vol 26 (2) ◽  
pp. 197-207
Author(s):  
Samir A Ashour ◽  
Sabry A Shihata ◽  
Ali A Akhtaruzaman ◽  
Faisal F Wafa
Keyword(s):  
Prestressed Concrete ◽  
High Strength Concrete ◽  
Concrete Beams ◽  
Bending Moment ◽  
High Strength ◽  
Torsional Stiffness ◽  
Test Results ◽  
Torsional Strength ◽  
Interaction Diagram ◽  
Strength Concrete

Test results of 16 rectangular prestressed high-strength concrete beams subjected to the combined action of torsion and bending are presented. The major variables were the ratio of torsion to the bending moment (T/M) and the prestressing level. The beams were subjected to two levels of prestressing, corresponding to 0.05fc' and 0.10fc', where fc' is the compressive strength of concrete (about 90 MPa). Test results showed that the torque-twist relations for the test beams were approximately linear up to cracking and thereafter became nonlinear. Increasing the T/M ratio and the prestressing level increases both torsional stiffness and strength. Several theoretical methods available in the literature developed for normal-strength concrete were used to predict the torsional strength of the tested high-strength concrete beams. Interaction equations were used along with some other methods to predict the torsional capacity in the presence of a bending moment. Good agreement was observed between the experimental and theoretical results.Key words: beams (supports), bending, cracking, failure, high-strength concrete, interaction diagram, prestressed concrete, stiffness, torsion, torsional strength.

scholarly journals Study on Model and Tests of Sheet Pile Wall with a Relieving Platform

2020 ◽  
Vol 2020 ◽  
pp. 1-16
Author(s):  
Ming Zhang ◽  
Wei Wang ◽  
Ronghua Hu ◽  
Ziyi Wang
Keyword(s):  
Finite Difference ◽  
Finite Difference Method ◽  
Difference Method ◽  
Retaining Wall ◽  
Earth Pressure ◽  
Bending Moment ◽  
Resistance Force ◽  
Sheet Pile ◽  
The Earth ◽  
The Finite Difference Method

A new type of retaining wall, the sheet pile wall with a relieving platform, is introduced in this paper. Based on the prototype retaining wall with a height of 12 meters, the model tests with a geometric similarity ratio of 7 are designed and we focus on the model production and analysis on the test results. Some comparative analyses between the measured values and the calculation values by using the theoretical calculation method and finite difference method are carried out, including Earth pressure behind the wall, prepile resistance force, the bending moment, and the deformation of rib pillars in the retaining wall. The results show that Earth pressure behind the wall has a linear increase with the depth and lies between Rankine Earth pressure and Earth pressure at rest. Moreover, the prepile resistance force can be approximated by the m method, and the bending moment can be also used for approximate calculation by the m method and is larger than the results calculated by the finite difference method. It is also observed that there is a zero-displacement point on the pile bottom, and the Earth pressure above the point behind the pile develops from Earth pressure at rest to the active Earth pressure; the Earth pressure under the point behind the pile develops from Earth pressure at rest to the passive Earth pressure. Therefore, the Earth pressure behind the bottom wall is larger than the calculated value by the Rankine theory. Finally, the displacement of the rib pillars is greater than the calculated results using the finite difference method and exceeds the standard requirements, owing to the failure of the retaining wall, and the unloading board needs to be constructed to improve the retaining wall’s behaviour. These findings verify the model’s credibility and provide an underpinning for studying the behavior of the retaining wall.

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