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.

Prestressed Anchor Bolt Impact on the Deformation of Composite Soil Nailing

2013 ◽  
Vol 353-356 ◽  
pp. 11-15
Author(s):  
Deng Qun Wang ◽  
Yan Peng Zhu
Keyword(s):  
Axial Force ◽  
Horizontal Displacement ◽  
Vertical Displacement ◽  
Soil Nailing ◽  
Foundation Pit ◽  
Obvious Effect ◽  
Anchor Bolt ◽  
Soil Nail ◽  
Finite Element Software ◽  
The Impact

Finite element software was employed to establish a model to simulate the compound soil nailing. The model simulates the process of constructing prestressed compound soil nailing. Compared the condition prestressed with no prestress, analyzed the Impact of prestress anchor on the deformation in the process of construction and the effect on axial force of soil nail. Applying prestress is able to control the horizontal displacement obviously, but has not obvious effect on vertical displacement, especially place the anchor bolt at the lower part of the slope. In the process of construction, prestress has an advance effect on the deformation of foundation pit and the axial force of soil nails near the anchor bolt.

Influence of degree of saturation on soil nail pull-out resistance in compacted completely decomposed granite fill

2007 ◽  
Vol 44 (11) ◽  
pp. 1314-1328 ◽  
Author(s):  
Li-Jun Su ◽  
Terence C.F. Chan ◽  
Y.K. Shiu ◽  
Tony Cheung ◽  
Jian-Hua Yin
Keyword(s):  
Shear Strength ◽  
Degree Of Saturation ◽  
Interface Shear Strength ◽  
Interface Shear ◽  
Soil Nails ◽  
Soil Nail ◽  
Pull Out ◽  
Decomposed Granite ◽  
Soil Interface ◽  
Completely Decomposed Granite

The nail–soil interface shear strength is a key parameter in the design and stability assessment of soil nailing systems. A number of factors will influence the nail–soil interface shear strength. Among these factors, the degree of saturation (Sr) of the soil is an important one especially for permanent soil nail structures. To study the influence of Sr on soil nail pull-out shear resistance, a series of laboratory pull-out tests have been conducted on soil nails in compacted completely decomposed granite (CDG) fill prepared to different Sr. The tests were conducted using two specially designed pull-out boxes (with same specifications). In the near-saturated tests, a high Sr (about 98%) was achieved using two special features of the apparatus: a waterproof front cap and back-water pressure pipes at the bottom of the pull-out box. Test results showed that the nail–soil shearing plane migrated outwards into the soil when the Sr of the soil increased. Also, peak pull-out strengths of soil nails were strongly influenced by the Sr of the soil. Among the tested Sr, the highest values of peak pull-out shear strength were obtained at Sr values between 50% and 75%.

The Time History of Axial Force of Soil Nail in Deep Excavation Course

2011 ◽  
Vol 243-249 ◽  
pp. 2259-2265
Author(s):  
Feng Li ◽  
Yuan Cheng Guo ◽  
Gang Shi ◽  
Hui Qian
Keyword(s):  
Axial Force ◽  
Time History ◽  
Time Dependent ◽  
Construction Process ◽  
Deep Foundation ◽  
Foundation Pit ◽  
Soil Nail ◽  
Deformation Curves ◽  
Axial Forces ◽  
History Of

This paper presents a theoretically study on the time-dependent characteristic of soil-nail axial force in the whole construction process of foundation pit. Firstly, the time-varying performance of axial forces of soil nails is analyzed according to the measured lateral deformation curves of pile-anchor and soil-nail composite supporting deep foundation pit. Then combined with a soil rheological model, a time-dependent formula of soil nail axial force is put forward, and the simulated results are compared to the back-analyzed ones. Finally, a formula to predict the time-dependent axial force of soil nail in the whole construction process of foundation pit is established and an example is investigated to validate the method.

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.

Soil Nailing Reliability Optimization Design of Foundation Pit Based on Response Surface Method

2014 ◽  
Vol 556-562 ◽  
pp. 4655-4659
Author(s):  
Jing Cao ◽  
Tian Liu ◽  
Hai Ming Liu
Keyword(s):  
Response Surface ◽  
Optimization Design ◽  
Failure Modes ◽  
Soil Nailing ◽  
Foundation Pit ◽  
Geotechnical Parameters ◽  
Soil Nail ◽  
Alternating Conditional Expectation ◽  
Surface Method ◽  
The Monte Carlo Method

Aiming at the randomness and variability of geotechnical parameters, the uniform test and nonparametric regression technique of alternating conditional expectation (ACE) is used to establish the efficiency response surface. On the basis of response surface, the Monte Carlo method was used to research the reliability optimal design and analysis method of soil nailing structure. Considering various failure modes of soil nailing structure, and setting the system failure probability as constraint, and per linear meter length of soil nail as the objective function, than to establish the reliability optimal model of soil nailing structure of foundation pit with the indexes of soil shear strength c, φ and ground overload as random variables. Through an engineering case analysis, the feasibility and effectiveness of this method are verified. Finally, the superiority of the proposed method is proved compared with the deterministic method.

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.

The effect of cemented soil strength on the frictional capacity of precast concrete pile–cemented soil interface

2020 ◽  
Vol 15 (11) ◽  
pp. 3271-3282 ◽  
Author(s):  
Jiajin Zhou ◽  
Jianlin Yu ◽  
Xiaonan Gong ◽  
M. Hesham El Naggar ◽  
Rihong Zhang
Keyword(s):  
Precast Concrete ◽  
Soil Strength ◽  
Cemented Soil ◽  
Concrete Pile ◽  
Soil Interface

On Overloading Design Method for the Slope of Deep Foundation Pit with Layered Soil Braced by Soil Nail

2013 ◽  
Vol 438-439 ◽  
pp. 724-727
Author(s):  
Li Hua Li
Keyword(s):  
Design Method ◽  
Limit Equilibrium ◽  
Work Rate ◽  
Layered Soil ◽  
Plastic Limit ◽  
Deep Foundation ◽  
Foundation Pit ◽  
Deep Foundation Pit ◽  
Soil Nail ◽  
Limit Equilibrium Theory

Based on plastic limit equilibrium theory of soil, the suitable values of energy safety factor are discussed here from energy work rate, the new design method for vertical slope of deep foundation pit with layered soil braced by soil nail with even overloading on slope top is proposed and engineering example is given out.

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