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.

scholarly journals WAVE RUN-UP PREDICTION VS. MODEL TEST RESULTS: A COMPARISON

1988 ◽  
Vol 1 (21) ◽  
pp. 47 ◽  
Author(s):  
Peter E. Gadd ◽  
Victor Manikian ◽  
Jerry L. Machemehl
Keyword(s):  
Physical Model ◽  
Model Test ◽  
Large Scale ◽  
Physical Model Test ◽  
Roughness Coefficient ◽  
Wave Steepness ◽  
Test Results ◽  
Shore Protection ◽  
Run Up

Large-scale physical model test measurements of wave run-up are compared with wave run-up prediction derived from the Shore Protection Manual (SPM). Noteworthy discrepancies between the results of these two methods have been identified that include substantial overestimation of wave run-up elevations using the SPM approach, and computation of roughness coefficient values that vary as a function of wave steepness. The slope armors tested in the study at model scales of 1:3 and 1:4 include linked concrete matting and overlapped gravel-filled fabric bags.

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 Analysis of Situ Test Results of Earth Pressure and Pile Internal Force under Pile-Anchor Support in a Deep Foundation Pit in Xi’an

2022 ◽  
Vol 2148 (1) ◽  
pp. 012051
Author(s):  
Ruibin Yang ◽  
Xinsheng Li ◽  
Dongzhou Xie ◽  
Hongte Meng
Keyword(s):  
Earth Pressure ◽  
Internal Force ◽  
Deep Foundation ◽  
Foundation Pit ◽  
Support Design ◽  
Limiting State ◽  
Obvious Effect ◽  
Deep Foundation Pit ◽  
The Earth ◽  
Monitoring Test

Abstract At present, in deep foundation pit engineering, on the one hand, practice is ahead of theory, and on the other hand, theory can not correctly reflect the actual construction process and environmental effects. In order to further study the distribution and change law of earth pressure and internal force of pile body in deep foundation pit pile-anchor supporting system, field monitoring test of earth pressure and pile body reinforcement stress was carried out. The monitoring results show that before excavation, the distribution of earth pressure has a great relationship with the layering of the soil, and it is distributed in sections along the depth. Compared with the theoretical static earth pressure, the measured data of the upper depth is relatively small; after excavation, the overall earth pressure is distributed along the depth in a “z” shape under the non-limiting state. As the excavation progresses, the magnitude of the reduction of the earth pressure varies from place to place, and the magnitude of the decrease of the soil with better properties is not large; after the excavation, the stress and earth pressure of the pile reinforcement correspond to each other, and the distribution is also nonlinear. The existence of anchor tension has an obvious effect on improving the internal force of the pile. The selected earth pressure calculation methods have some discrepancies in the calculation of the earth pressure value of the project, and they need to be further improved. The research in this paper can provide reference and reference for the calculation of earth pressure and support design of pile-anchor supported foundation pit.

Physical model test of transparent soil on coupling effect of cut-off wall and pumping wells during foundation pit dewatering

2018 ◽  
Vol 14 (1) ◽  
pp. 141-162 ◽  
Author(s):  
Jianxiu Wang ◽  
Xiaotian Liu ◽  
Shaoli Liu ◽  
Yanfei Zhu ◽  
Weiqiang Pan ◽  
...  
Keyword(s):  
Physical Model ◽  
Model Test ◽  
Coupling Effect ◽  
Physical Model Test ◽  
Foundation Pit ◽  
Transparent Soil ◽  
Pumping Wells

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.

Analyses of Earth Pressure on Gridding Concrete Retaining Wall in the Excavation of Deep Foundation Pit in Soft Soil Area

2011 ◽  
Vol 52-54 ◽  
pp. 2181-2186
Author(s):  
Guang Zhu Zhou ◽  
Xu Wei ◽  
Chen Yu
Keyword(s):  
Retaining Wall ◽  
Soft Soil ◽  
Earth Pressure ◽  
Front Wall ◽  
Three Dimension ◽  
Deep Foundation ◽  
Foundation Pit ◽  
Finite Element Software ◽  
The Earth ◽  
Practical Engineering

This paper is mainly to study earth pressure on Gcrw used as a new kind of supporting structures in the excavation of deep foundation pits in soft soil region. On the basis of the simulation of step by step excavation by using big finite element software Abaqus/CAE and considering three-dimension elastoplastic stress state, the characteristics of different earth pressure are systematically discussed upon practical engineering. By comparing simulation results with calculated results based on calculation formula of Rankine Theory, it can be seen that the earth pressure in active zone is different from theoretic active earth pressure and earth pressure at rest while walls and soil in the gridding are regarded as a whole, which is greater than the former and somewhere similar to the latter, the earth pressure in passive zone is bigger than theoretic value of passive earth pressure, it is the tensive force from partition wall that prevent the front wall from overturning. These conclusions will be helpful for design and construction of new retaining wall.

Numerical Simulation Using Finite Element and Earth Pressure Analysis on Double-Row Pile Retaining Structures

2011 ◽  
Vol 261-263 ◽  
pp. 923-927
Author(s):  
Jian Zhou ◽  
Zi Han Wang
Keyword(s):  
Finite Element ◽  
Earth Pressure ◽  
Three Dimension ◽  
Spatial Effects ◽  
Foundation Pit ◽  
Double Row ◽  
Retaining Structures ◽  
Finite Element Software ◽  
The Earth ◽  
Pressure Analysis

The characters on double-row pile retaining structures are affected significantly by spatial effects. In this paper, double-row pile retaining structures are simulated numerically in three-dimension by finite element software PLAXIS. The behavior differences among piles in different positions around the foundation pit are analyzed. The results show that the deformation and moment are biggest in the middle of long side of the foundation pit. It is suggested that the earth pressure between the rows above the pit bottom is close to active earth pressure.

Research on Plane Strain Model Test of Rockburst of Underground Cavern in Hard Brittle Rockmass

2014 ◽  
Vol 501-504 ◽  
pp. 1810-1814 ◽  
Author(s):  
Yu Zhou Jiang ◽  
Rui Hong Wang ◽  
Tian Cai Tang ◽  
Jin Long Guo
Keyword(s):  
Physical Model ◽  
Plane Strain ◽  
Model Test ◽  
Large Scale ◽  
Failure Process ◽  
Initial Crack ◽  
Physical Models ◽  
Brittle Rock ◽  
Physical Model Test ◽  
Underground Cavern

In order to study the failure process and mechanism of rockburst of underground cavern, the physical model materials of hard brittle rock which is gotten though similar material test and have the tendency of rockburst are prepared for making cavern physical models of 1000mm*1000 mm*1000mm and φ 150mm. Then plane strain physical model test is carried out on the machine for large-scale physical model test in geotechnical engineering. The results show that the state of rock switches from the elastic to the plastic on the condition that horizontal and vertical load of the model is equal and increase synchronously. The failures of hard brittle rock burst in surrounding rock are mainly in the initial crack of rock. The phenomenon of separation by layer appears around the cave walls. Damage occurs in very short time and extremely narrow loading range and is sudden with chippings popping or fragments falling. After failure rock stress readjusts and keeps relatively stable in a relatively long time and loading range.

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