Numerical Analysis on Mechanical and Deformation Characteristics of Pile-Anchor Retaining Structure for Waterway Excavation

2013 ◽  
Vol 734-737 ◽  
pp. 682-685
Author(s):  
Zhi Yu He ◽  
Jiang Feng Wang ◽  
Li Fu
Keyword(s):  
Numerical Simulation ◽  
Numerical Model ◽  
Inflection Point ◽  
Horizontal Displacement ◽  
Simulation Method ◽  
Measured Data ◽  
Deformation Characteristics ◽  
Retaining Structure ◽  
Anchor Cable ◽  
Construction Procedure

Mechanical and deformation characteristics of pile-anchor retaining structure was analyzed by using numerical simulation method. The rationality of numerical model was also verified through comparing measured data in field test and numerical results. On the basis of this numerical model, Mechanical and deformation characteristics of pile-anchor retaining structure under three different construction procedures were analyzed individually. The results show that: the maximum horizontal displacement of pile is controlled effectively by applying anchoring force, and the global horizontal displacement of pile increases as well. Forced state of pile is changed from being bended on one side to being bended on both sides, and maximum moment value decreases heavily. Therefore, anchor cable reinforcement should be arranged at the head of construction procedure of pile-anchor retaining structure. The later anchoring force be applied, the closer inflection point nears the pile top.

Effect Analysis of Soil Improvement on Mechanical and Deformation Characteristics of Supporting Structure in Soft Area

2013 ◽  
Vol 353-356 ◽  
pp. 274-277
Author(s):  
Zhi Yu He ◽  
Li Fu ◽  
Jiang Feng Wang
Keyword(s):  
Numerical Model ◽  
Simulation Method ◽  
Soil Improvement ◽  
Measured Data ◽  
Deformation Characteristics ◽  
Replacement Rate ◽  
Replacement Ratio ◽  
Effect Analysis ◽  
Retaining Structure ◽  
Supporting Structure

Mechanical and deformation characteristics of pile-anchor retaining structure was analyzed by using numerical simulation method. The rationality of numerical model was also verified through comparing measured data in field test and numerical results. On the basis of this numerical model, Mechanical and deformation characteristics of supporting structure under the condition of different soil replacement ratio (m) was analyzed. The results show that: mechanical and deformation characteristics of supporting structure was improved by improving soil which behind retaining pile. The higher the soil replacement rate is, the effect to mechanical and deformation characteristics of supporting structure was more obvious.

Numerical Research on the Floor Heave Control of Deep Roadway in Coal Mining

2012 ◽  
Vol 524-527 ◽  
pp. 446-449 ◽  
Author(s):  
Fu Kun Xiao ◽  
Chun Jie Zhang ◽  
Li Wei Gao ◽  
Yang Yang Yue
Keyword(s):  
Numerical Simulation ◽  
Simulation Method ◽  
Good Effect ◽  
Optimal Program ◽  
Anchor Cable ◽  
Geological Conditions ◽  
Floor Heave ◽  
Mine Roadway ◽  
Numerical Research ◽  
Main Factors

On the engineering background of coal mine roadway orbit, according to the destruction of its original roadway, the paper have analyzed the situation of the deformation in the roadway , using the method of numerical simulation. Besides, it also determined the stress distribution and the forces supporting of roadway in the deformation process. Geological conditions, support patterns and bad construction are considered as the main factors of roadway damage and new support method is given. Numerical simulation method is used to study mechanism about anchor rod, anchor cable and anchor mesh coupled with the surrounding, bottom corner anchor rod and grouting to determine the optimal program. The new program is applied to the practice field and monitored, indicating that the application has a very good effect.

scholarly journals Numerical Simulation of Soil Displacement and Settlement in Deep Foundation Pit Excavations Near Water

Geofluids ◽  
2021 ◽  
Vol 2021 ◽  
pp. 1-14
Author(s):  
Zhongjing Hu ◽  
Qingbiao Wang ◽  
Shuo Yang ◽  
Zhenyue Shi ◽  
Bo Liu ◽  
...  
Keyword(s):  
Numerical Simulation ◽  
Large Scale ◽  
Yellow River ◽  
Soft Soil ◽  
Ground Surface ◽  
Horizontal Displacement ◽  
Simulation Method ◽  
Deep Foundation ◽  
Foundation Pit ◽  
Deep Foundation Pit

Advancing urbanization in China requires large-scale high-rise construction and underground transportation projects. Consequently, there is an increasing number of deep foundation pits adjacent to water bodies, and accidents occur frequently. This study uses a numerical simulation method to study the stability of the deep foundation pit near water based on the Biot three-dimensional seepage-stress coupling model, with the open-cut section on the south bank of the Jinan Yellow River Tunnel Project as the engineering field test. This indicates the following: (1) the maximum horizontal displacement of the diaphragm wall occurred in the fifth excavation stage, and a horizontal brace effectively controlled the inward horizontal displacement of the foundation pit; (2) considering the effect of seepage in the soft soil foundation, the maximum vertical displacement of the ground surface at each excavation stage occurred adjacent to the underground continuous wall. As the depth of the foundation pit increased, the vertical surface settlement decreases gradually in the direction away from the excavation face; (3) considering the seepage conditions, within each interval of excavation of the foundation pit, the horizontal displacement of the continuous underground wall and ground settlement declined; and (4) the numerical simulation and field monitoring data were in good agreement. Under the conditions of accurate model simplification and parameter selection, numerical simulations can adequately forecast conditions of the actual project.

Contrastive Analysis between Shifosi Reservoir Impoundment Test and Numerical Simulation Results

2013 ◽  
Vol 353-356 ◽  
pp. 2600-2603
Author(s):  
Jun Pan ◽  
Te Leng ◽  
Yang Liu
Keyword(s):  
Numerical Simulation ◽  
Model Prediction ◽  
Simulation Method ◽  
Measured Data ◽  
Water Levels ◽  
Model Parameters ◽  
Contrastive Analysis ◽  
Reservoir Impoundment ◽  
Simulation Results ◽  
Sensitive Parameters

Using numerical simulation method for project simulating prediction, the built mathematical models of actual conditions often need to be generalized, consequently, there are some inevitably deviations between model prediction results and the measured data, which requires the adjustment of model parameters to improve the model. This paper made a comparative analysis of Shifosi reservoir impoundment test observation water levels and model prediction water levels, adjust the model parameters and boundary conditions, then it would get the sensitive parameters that affect the accuracy and stability of numerical model and boundary condition and improve the fitting degree of measured data and simulation results.

Study on Critical Anchorage Length of Bolts by Numerical Simulation Method

2012 ◽  
Vol 204-208 ◽  
pp. 4771-4775
Author(s):  
Bo Wang ◽  
Jian Nan Zhou ◽  
Feng Nian Jin ◽  
Mei Rong Jiang
Keyword(s):  
Numerical Simulation ◽  
Comparative Analysis ◽  
Frictional Resistance ◽  
Simulation Method ◽  
Calculation Model ◽  
Measured Data ◽  
Anchorage Length ◽  
Numerical Simulation Method

Numerical simulation method was used to study the problems on critical anchorage length of bolts. 3-D calculation model was built by FLAC program. By numerical simulation calculations, the conclusion could be drawn: the frictional resistance contribution had nothing to do with drawing forces, and was relevant to the bond stiffness of anchor mortar. And comparative analysis results of one engineering example showed that the calculated values by the presented method agreed well with the measured data.

Numerical Simulation on Framed Anti-Sliding Piles

2011 ◽  
Vol 393-395 ◽  
pp. 209-212
Author(s):  
Tong Hui Qian ◽  
Hong Xing Ding ◽  
Zhou Bing Cheng ◽  
Fang Chen
Keyword(s):  
Numerical Simulation ◽  
Single Layer ◽  
Horizontal Displacement ◽  
Force Model ◽  
Framework Structure ◽  
Double Row ◽  
Retaining Structure ◽  
Calculation Results ◽  
Soil Arch ◽  
Coordination Action

As a new bracing structure, the framed anti-sliding piless based on spatial framework structure, which have the advantages of less displacement in the top of the piles and large anti-force, are developed as a new retaining structure, and can be used to reduce the piles deformation. However, the previous calculation models of double-row piles ignored the deformation coordination action between linking beams and ring beams, the interaction between piles and beams. Further more the calculation results based on the models are not accurate enough. In this paper, a spatial force model of the framed anti-sliding piles is presented. Taking framed anti-sliding piles as a single-layer multi-span frame affected by piles, beams and soils, the spatial synergic interaction between top ring beam and linking beam, as well as the affection of soil-arch on the frame are analyzed. The horizontal displacement in front of the framed anti-sliding piles and distribution of axial force and moment of piles are studied by Finite element method. The results reflect commendably the stress and distortion character of the framed anti-sliding piles. Finally, some rules about the pile-beam-soil interaction in the pile structure are summarized.

Study on the Deformation Characteristics of Supporting System of Deep Foundation Pit in Subway Station Construction

2011 ◽  
Vol 243-249 ◽  
pp. 546-551
Author(s):  
Hua Zhi Zhang ◽  
Yi Fang Feng
Keyword(s):  
Numerical Simulation ◽  
Horizontal Displacement ◽  
Subway Station ◽  
Deformation Characteristics ◽  
Deep Foundation ◽  
Foundation Pit ◽  
Deep Foundation Pit ◽  
Supporting System ◽  
Simulation Results ◽  
Metro Project

Taking Jiyu Bridge Station of Wuhan Metro Project as example, the deformation characteristics of supporting system of deep foundation pit was studied by means of numerical simulation (FLAC3D) in consideration of construction order. The deformation fields of different excavation depths of diaphram wall were obtained and analyzed in order to gain the maximum horizontal displacement value and settlement value. By comparison with the monitoring data, the simulation results can basically reflect the deformation characteristics. Moreover, the simulation results showed that the application of diaphram wall was feasible for foundation pit supporting in Jiyu Bridge Station, meanwhile, the results can be based on to guide the construction.

Numerical Simulation of Damage and Deformation Characteristics of Rock Mass with Transfixion Joint

2013 ◽  
Vol 405-408 ◽  
pp. 369-372
Author(s):  
Lei Wang ◽  
Jiang Yu ◽  
Jian Xin Han
Keyword(s):  
Numerical Simulation ◽  
Rock Mass ◽  
Strain Curve ◽  
Simulation Method ◽  
Joint Surface ◽  
Deformation Characteristics ◽  
Stress Strain Curve ◽  
Deformation Parameters ◽  
Strength And Deformation ◽  
Set Up

Use FLAC3D, the interface command to define joint surface, set up rock mass models with 15 °, 30 °, 60 °, etc. different dip joint, and in accordance with the laboratory test data of rock and joint surface for a variety of strength and deformation parameters setting, carries on the numerical simulation of uniaxial compression. Got failure mode, plastic zone evolution and the stress strain curve of rock mass with different dip joint, and the result compared with the actual test has a higher similarity, to prove the feasibility of the numerical simulation method.

Numerical Simulation Method of Tensile Behavior of Glass Fiber Laminates

2014 ◽  
Vol 919-921 ◽  
pp. 1386-1389
Author(s):  
Shao Chong Yang ◽  
Jian Hui Zhang
Keyword(s):  
Numerical Simulation ◽  
Finite Element ◽  
Numerical Model ◽  
Glass Fiber ◽  
Test Data ◽  
Structural Characteristics ◽  
Simulation Method ◽  
Fe Analysis ◽  
Tensile Behavior ◽  
Ansys Software

Based on the structural characteristics of glass fiber laminates, a novel finite element numerical model of the laminates was proposed and established with ANSYS software. The results from the FE analysis are compared with available test data in the literature [1], which indicate the numerical model is reasonable and reliable. At same time, tensile behavior and shear behavior of the glass fiber laminates was analyzed. This study can provide reference for glass fiber laminates design and calculation, and has important practical value.

scholarly journals Kinematics of Planetary Roller Screw Mechanism considering Helical Directions of Screw and Roller Threads

2015 ◽  
Vol 2015 ◽  
pp. 1-11 ◽  
Author(s):  
Shangjun Ma ◽  
Tao Zhang ◽  
Geng Liu ◽  
Ruiting Tong ◽  
Xiaojun Fu
Keyword(s):  
Numerical Simulation ◽  
Numerical Model ◽  
Analytical Model ◽  
Analytical Solutions ◽  
Simulation Method ◽  
Screw Thread ◽  
Numerical Simulation Method ◽  
Roller Screw ◽  
Screw Mechanism ◽  
Planetary Transmission

Based on the differential principle of thread transmission, an analytical model considering helical directions between screw and roller threads in planetary roller screw mechanism (PRSM) is presented in this work. The model is critical for the design of PRSM with a smaller lead and a bigger pitch to realize a higher transmission accuracy. The kinematic principle of planetary transmission is employed to analyze the PRSM with different screw thread and roller thread directions. In order to investigate the differences with different screw thread and roller thread directions, the numerical model is developed by using the software Adams to validate the analytical solutions calculated by the presented model. The results indicate, when the helical direction of screw thread is identical with the direction of roller thread, that the lead of PRSM is unaffected regardless of whether sliding between screw and rollers occurs or not. Only when the direction of screw thread is reverse to the direction of roller thread, the design of PRSM with a smaller lead can be realized under a bigger pitch. The presented models and numerical simulation method can be used to research the transmission accuracy of PRSM.

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