Application of Axial Force Compensation for Steel Support System in Practical Project

2013 ◽  
Vol 477-478 ◽  
pp. 503-508 ◽  
Author(s):  
Shi Min Zhang ◽  
Xing Ming Jia ◽  
Teng Kun Yuan ◽  
Wei Guo Liu ◽  
Yin Jun
Keyword(s):  
Significant Role ◽  
Axial Force ◽  
Support System ◽  
Internal Force ◽  
Compensation System ◽  
Foundation Pit ◽  
Practical Project ◽  
Practical Engineering ◽  
Force Monitoring ◽  
Force Compensation

The problem always exist in foundation pit engineering that the support axial force can not be regulated in the pit system in real time.According to setting the axial force compensation system,the problem would be solved perfectly and efficiently,realizing the fact control and adjust the support axial force and stability. The axial force compensation system which is constituted by jacks distributed in the pit has been confirmed the significant role to control foundation pit deformation and internal force monitoring combined with practical engineering

scholarly journals Preliminary Discussion on Monitoring of Steel Support Axis Force in Metro Engineering

2019 ◽  
Vol 136 ◽  
pp. 04045
Author(s):  
Yiteng Xu ◽  
Feng Xu ◽  
Peirong Deng ◽  
Bin Li ◽  
Zhifa Yu ◽  
...  
Keyword(s):  
Axial Force ◽  
Warning System ◽  
Safety Monitoring ◽  
Control Measures ◽  
Foundation Pit ◽  
Depth Analysis ◽  
Force Monitoring ◽  
And Control ◽  
Monitoring Behavior ◽  
Irregular Behavior

Axial force monitoring of steel support is one of the important factors for foundation pit safety monitoring. In the monitoring of steel support, there are many problems, such as unreasonable installation of axonometer, irregular monitoring behavior of axonometer, incomplete analysis of axial force and imperfect early warning system. Collecting many engineering cases, and in-depth analysis and research on the problems and irregular behavior of steel support axial force monitoring in every link. The influencing factors and control measures of steel support axial force are discussed in detail, and some useful conclusions are obtained. It has been applied in the actual monitoring work and achieved good results. It is of great significance to guide subway safety construction and promote the development of axle force monitoring industry.

Study on Effect of Excavation Depth on Internal Force of Retaining Structure of Arc Row Piles with Arc Ring Beam on the Pile Top

2014 ◽  
Vol 919-921 ◽  
pp. 762-768
Author(s):  
Zhi Wei Zhang ◽  
Rong Gui Deng ◽  
Ze Shuo Chen
Keyword(s):  
Internal Force ◽  
Calculation Model ◽  
Structure Calculation ◽  
Foundation Pit ◽  
Engineering Research ◽  
Retaining Structure ◽  
Body Distribution ◽  
Practical Engineering ◽  
Set Up ◽  
Deformation Compatibility

In order to control deformation of foundation pit effectively and guarantee safety of building around, utilizing the stress characteristics of arch, use the new spatial retaining structure of arc row piles with arc ring beam on the pile top. The arc ring beam can provide constraint to pile top, so internal force of pile body distribution is uniform, and improve the integrity stability of piles. The ring beam with compression mainly can give use of high compression capability of concrete. According to the high order statically indeterminate characteristics of the retaining structure, calculation model of ring beam and pile respectively is established by the redundant forces between beam and pile top. By using deformation compatibility to set up flexibility equation of the retaining structure, and solve the redundant forces, then calculate the internal force and displacement of ring beam and piles. Through calculating the practical engineering, research the effect of excavation depth on internal force and displacement of piles and the arc ring beam on the pile top.

Whole-Process Analysis of the Mechanical Responses of High Formwork Support Systems during Concrete Pouring

2013 ◽  
Vol 368-370 ◽  
pp. 1583-1590
Author(s):  
Chang Ming Hu ◽  
Yan Guo ◽  
Jie Wang ◽  
Qiong Wu
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Axial Force ◽  
Support System ◽  
Mechanical Response ◽  
Process Analysis ◽  
Internal Force ◽  
Element Analysis ◽  
Whole Process ◽  
The Finite Element Analysis

An underground club in Xian is taken as the research object to explore the mechanical response of the internal poles of its high formwork support system during concrete pouring. The internal force static measurement of the high formwork support system is carried out. Each stage of the concrete pouring is simulated by the finite element analysis software ANSYS in the form of load step, whose results are contrasted with the measured results. The contrast reveals that the concrete pouring sequence has direct influence on the tendency of poles axial force and on the location of maximum axial force and that it is reasonable to adopt imaginary horizontal force which simulates the initial defects to carry out the overall stability analysis of the high formwork support system. It is pointed out that the program of setting up the formwork and the concrete pouring sequence should be determined with the finite element analysis.

scholarly journals Comparative Study of Pile Pillared Support and Pile-anchor Retaining in Deep Pit

2020 ◽  
Vol 143 ◽  
pp. 01042
Author(s):  
Chengxiang Wang ◽  
Chengkun Lu ◽  
Wei Han ◽  
Hongsong Sun ◽  
Huailiang Kou
Keyword(s):  
Elastic Modulus ◽  
Internal Friction ◽  
Axial Force ◽  
Soil Layer ◽  
Friction Angle ◽  
Internal Force ◽  
Internal Friction Angle ◽  
Deep Foundation ◽  
Foundation Pit ◽  
Deep Foundation Pit

Support pattern is the most important factor affecting the stability of foundation pit. In order to study the stable state of deep foundation pit, this paper selects pile pillared support and pile-anchor retaining which are high accident rate for comparison, and optimizes the construction scheme combined with the actual deep foundation pit project. The deformation of the supporting structure and the settlement of the foundation pit of Huiquan Square are used to analyze by FLAC3D. The variation range and trend of the internal force of the steel support and the axial force of the anchor cable are analyzed under the different values of the soil layer parameters, such as elastic modulus, cohesion and internal friction angle. The results show that the internal force of pile pillared support is greatly affected by the change of cohesion and the anchor axial force is greatly affected by the change of elastic modulus and internal friction angle. Meanwhile, the influence degree of each soil layer parameter on the internal force of support structure is different, which provides reference suggestions for the selection of support pattern of deep foundation pit.

scholarly journals Application of intelligent anchor cable axial force monitoring system in foundation pit support engineering

2018 ◽  
Vol 175 ◽  
pp. 03019
Author(s):  
HUANG Zheng-jun ◽  
ZHANG Lei ◽  
JIAO Shen-hua ◽  
LIU Yu ◽  
ZHANG Dong ◽  
...  
Keyword(s):  
Real Time ◽  
Monitoring System ◽  
Axial Force ◽  
Engineering Application ◽  
Monitoring Data ◽  
Support Structure ◽  
Foundation Pit ◽  
Anchor Cable ◽  
Force Monitoring ◽  
Support Engineering

Using the self-developed intelligent anchor (cable) axial force monitoring system, real-time on-line monitoring of the axial force of the prestressed anchor and anchor cable in the foundation pit support structure system is realized. The system has automatic acquisition, wireless transmission, real-time monitoring and other advantages. Through actual engineering application and comparative analysis of traditional methods of monitoring data, it can be seen that the monitoring data is also valid and reliable, and the continuity and difference error of the measured curve is better than the traditional method. The system monitoring data can better reflect the relationship between the support structure stress, deformation and construction process in the foundation pit engineering and provide a strong guarantee for the safe and efficient construction of the foundation pit project.

scholarly journals Internal Force on and Deformation of Steel Assembled Supporting Structure of Foundation Pit under Thermal Stress

2021 ◽  
Vol 11 (5) ◽  
pp. 2225
Author(s):  
Fu Wang ◽  
Guijun Shi ◽  
Wenbo Zhai ◽  
Bin Li ◽  
Chao Zhang ◽  
...  
Keyword(s):  
Three Dimensional ◽  
Bending Moment ◽  
High Strength ◽  
Element Model ◽  
Internal Force ◽  
Foundation Pit ◽  
Dimensional Finite Element ◽  
Influence Of Temperature On ◽  
Scale Experiment ◽  
Three Dimensional Finite Element

The steel assembled support structure of a foundation pit can be assembled easily with high strength and recycling value. Steel’s performance is significantly affected by the surrounding temperature due to its temperature sensitivity. Here, a full-scale experiment was conducted to study the influence of temperature on the internal force and deformation of supporting structures, and a three-dimensional finite element model was established for comparative analysis. The test results showed that under the temperature effect, the deformation of the central retaining pile was composed of rigid rotation and flexural deformation, while the adjacent pile of central retaining pile only experienced flexural deformation. The stress on the retaining pile crown changed little, while more stress accumulated at the bottom. Compared with the crown beam and waist beam 2, the stress on waist beam 1 was significantly affected by the temperature and increased by about 0.70 MPa/°C. Meanwhile, the stress of the rigid panel was greatly affected by the temperature, increasing 78% and 82% when the temperature increased by 15 °C on rigid panel 1 and rigid panel 2, respectively. The comparative simulation results indicated that the bending moment and shear strength of pile 1 were markedly affected by the temperature, but pile 2 and pile 3 were basically stable. Lastly, as the temperature varied, waist beam 2 had the largest change in the deflection, followed by waist beam 1; the crown beam experienced the smallest change in the deflection.

On Numerical Simulation of the Stepped Soil-Nail Wall

2013 ◽  
Vol 353-356 ◽  
pp. 692-695
Author(s):  
Chang Zhi Zhu ◽  
Quan Chen Gao
Keyword(s):  
Numerical Simulation ◽  
Numerical Analysis ◽  
Internal Force ◽  
Numerical Results ◽  
Analysis Model ◽  
Foundation Pit ◽  
Soil Nails ◽  
Soil Nail ◽  
Soil Nail Wall ◽  
Design And Construction

Based on an Engineering Example which was supported by the stepped soil-nail wall, a numerical analysis model was established by FLAC3D,and the process of the excavation and supporting was simulated, and the numerical results of the soil nails internal force and foundation pit deformation were obtained. The simulated result was consistent with the measured results. It shows that the method of FLAC3D numerical analysis can be used to the numerical analysis of foundation pit excavation and supporting, and it will provide the basis for the design and construction of practice project.

scholarly journals The Influence of Pile-Driving Vibration on the Soil Nailing Support of a Silty Soil Foundation Pit

2021 ◽  
Vol 2021 ◽  
pp. 1-16
Author(s):  
Yuancheng Guo ◽  
Hao Wu ◽  
Chenglin Li
Keyword(s):  
Axial Force ◽  
Soil Strength ◽  
Interface Strength ◽  
Pile Driving ◽  
Vibration Exciter ◽  
Foundation Pit ◽  
Soil Nail ◽  
Pull Out ◽  
Working Length ◽  
Soil Interface

The ground vibration induced by pile driving affects the safety of the adjacent foundation pit. In this paper, the influence of pile-driving vibration on the soil strength and the nail-soil interface strength was studied, and the variation in the axial force and displacement of the soil nail under vibration was analyzed. The paper studied the effects under different vibration parameters on the soil strength and the nail-soil interface strength by using a vibration exciter and a nail pull-out model box. The results showed that the stronger the excitation force was and the higher the frequency was, the greater the attenuation of the soil strength and nail-soil interface strength was. On the contrary, the change of the internal friction angle of the soil was not obvious under the vibration. The nail-soil interface strength recovered when the vibration terminated. Decreases in c and τp led to an increase in the working length of the soil nail, a redistribution of the axial force, and an augmentation in the soil nail displacement.

scholarly journals Application of Constant Resistance and Large Deformation Anchor Cable in Soft Rock Highway Tunnel

2019 ◽  
Vol 2019 ◽  
pp. 1-19 ◽  
Author(s):  
Xiaoming Sun ◽  
Bo Zhang ◽  
Li Gan ◽  
Zhigang Tao ◽  
Chengwei Zhao
Keyword(s):  
Large Deformation ◽  
Support System ◽  
Field Tests ◽  
Soft Rock ◽  
Internal Force ◽  
Surrounding Rock ◽  
Gansu Province ◽  
Tunnel Engineering ◽  
Anchor Cable ◽  
Constant Resistance

Muzhailing Highway Extra-long Tunnel in Lanzhou, Gansu Province, China, belongs to the soft rock tunnel in the extremely high geostress area. During the construction process, large deformation of the soft rock occurred frequently. Taking the no. 2 inclined shaft of Muzhailing tunnel as the research object, an NPR (negative Poisson’s ratio) constant resistance and large deformation anchor cable support system based on high prestress force, constant resistance, and releasing surrounding rock pressure was proposed. The characteristics of the surrounding rock under the steel arch support and NPR anchor cable support were compared and analyzed by using 3DEC software. A series of field tests were conducted in the no. 2 inclined shaft, and the rock strength, displacement of the surrounding rock, deep displacement of the surrounding rock, internal force of steel arch, and axial force of anchor cable were measured to study the application effect of the NPR anchor cable support system in tunnel engineering. Moreover, the 3DEC numerical simulation results were compared with the field test results. The research results show that the application of NPR constant resistance and large deformation anchor cable support system in tunnel engineering has achieved good results, and it plays a significant role in controlling the large deformation of the tunnel surrounding rock.

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