Analysis of Construction Monitoring of Jinzhou Underground Mall Excavation

2013 ◽  
Vol 848 ◽  
pp. 74-77
Author(s):  
Jin Kui Li ◽  
Yue Bo Fan ◽  
Yi Bing Wang
Keyword(s):  
Environmental Conditions ◽  
Horizontal Displacement ◽  
Ground Settlement ◽  
Foundation Pit ◽  
Construction Monitoring ◽  
Construction Period ◽  
Surrounding Environment ◽  
Information Construction ◽  
Real Time Information ◽  
Time Information

Cause the deformation of soil around the foundation pit excavation, have a great impact on the surrounding environment. At the same time, the excavation is limited by surrounding environmental conditions. Relying on the Jinzhou underground mall excavation monitoring project, after monitoring the ground settlement and horizontal displacement of pile top and measurement during the construction period, we realize the real-time information construction ,safe and smooth construction in the process of construction. And we conclude some useful conclusions, which can be a reference for similar engineering and reference.

scholarly journals Application and Research of Soil Mixing Wall

2020 ◽  
Vol 3 (2) ◽  
Author(s):  
Runjie Gu
Keyword(s):  
Support Structures ◽  
Foundation Pit ◽  
Development Potential ◽  
Construction Period ◽  
Supporting Structure ◽  
Soil Mixing ◽  
Surrounding Environment ◽  
Supporting Structures ◽  
Great Development

Soil Mixing Wall can meet the needs of foundation pit support structures in various projects. Compared with other supporting structures, it has the advantages of good permeability resistance, short construction period, and less impact on the surrounding environment. It is a foundation pit supporting structure with great development potential<sup>[1]</sup>.

scholarly journals Numerical Simulation and Optimization Design of End-Suspended Pile Support for Soil-Rock Composite Foundation Pit

2021 ◽  
Vol 2021 ◽  
pp. 1-15
Author(s):  
Qingchao Xu ◽  
Zhenhao Bao ◽  
Tu Lu ◽  
Huarui Gao ◽  
Jiakang Song
Keyword(s):  
Numerical Simulation ◽  
Optimization Design ◽  
Boundary Effect ◽  
Horizontal Displacement ◽  
Element Model ◽  
Composite Foundation ◽  
Ground Settlement ◽  
Foundation Pit ◽  
Simulation And Optimization ◽  
Geological Conditions

In order to design the soil-rock combination foundation pit more safely and effectively, this paper presents the investigations of the mechanical and deformational characteristics of end-suspended piles supporting the structures in Jinan CBD area. Based on the measured data, a finite element model was established through the two-dimensional numerical simulation method to study the deformational characteristics of the end-suspended piles, and the influences of the depth of socketed rock, the width of rock shoulder, and the prestress of anchor cables on the deformations and mechanical property of end-suspended piles were discussed. Some optimization methods are proposed based on these analyses. Results show the following: (1) Rock-socketed depths have boundary effect on end-suspended piles. Under the given geological conditions, the reasonable socketed ratio is within 0.158∼0.200. (2) The anchor cable prestress can effectively slow down the ground settlement, the force, and deformation of the pile body and can be set to 1P∼1.25P under the conditions of the site. (3) Rock-shoulder width has little influence on the ground settlement and horizontal displacement of piles. The reserved width of rock shoulder is suggested to be selected in the range of 1.0 m∼1.5 m.

scholarly journals Analysis of Foundation Pit Design of Metro Station in Complex Environment

2021 ◽  
Vol 2021 ◽  
pp. 1-9
Author(s):  
Yunchao Tao
Keyword(s):  
Environmental Conditions ◽  
Underground Engineering ◽  
Foundation Pit ◽  
Support Design ◽  
Metro Station ◽  
Construction Period ◽  
Geological Features ◽  
Geological Conditions ◽  
The Cost ◽  
Pit Design

The complex engineering geological conditions and the surrounding environmental conditions of the existing subway lines and adjacent buildings have significantly deepened the difficulty of metro station foundation pit design and construction. Based on the foundation pit project of Luboyuan Station of Nanjing Metro Line 9, this study chooses a reasonable foundation pit support design scheme to carry out related research by analyzing the site geological environmental conditions. Through the analysis and evaluation of the engineering geological conditions of the engineering site, the engineering geological problems that may occur in the process of construction are given. According to the lithologic characteristics of the site strata, the hydrogeological conditions, and the features of the underground engineering structure, the design of the foundation pit supporting system is optimized and analyzed. The results show that making full use of the geological features of strata and adopting effective support methods can ensure the safety of foundation pit construction, reduce the cost of engineering description, and shorten the construction period, which can be used as a reference for similar projects and construction.

scholarly journals Deformation Characteristic of a Supported Deep Excavation System: A Case Study in Red Sandstone Stratum

2021 ◽  
Vol 12 (1) ◽  
pp. 129
Author(s):  
Weizheng Liu ◽  
Tianxiong Li ◽  
Jiale Wan
Keyword(s):  
Horizontal Displacement ◽  
Spatial Effects ◽  
Deep Excavation ◽  
Ground Settlement ◽  
Foundation Pit ◽  
Short Side ◽  
Case Record ◽  
Red Sandstone ◽  
Anchor Cable ◽  
Vertical Excavation

A complete case record of a deep foundation pit with pile-anchor retaining structure excavated in red sandstone stratum is presented in this study. The horizontal displacement of pile top, the horizontal displacement at various depths, the axial force of anchor cable, and ground settlement during construction are measured. A three-dimensional numerical model is established to analyze the additional stress and deformation induced by the excavation and the accuracy of the FEM model is verified by comparing with field measured results. Both the measured and numerical simulation results show that the deformation of the pile-anchor supported deep excavation is significantly affected by the spatial effect. The results show that the deformation in the middle of the foundation pit is greater than the pit angle and that the deformation of the long side is greater than that of the short side and gradually decreases from the middle to the pit angle. The deformation and stress in the middle of the long side of the foundation pit are the largest, which is the most unfavorable part. With the increase of vertical excavation depth, the spatial effects tend to increase, and the influence scope of spatial effects is about five times the vertical excavation depth in the red sandstone stratum. The ground settlement outside the pit is mainly distributed in a groove shape, and the maximum settlement occurs about 8.5 m away from the pit edge. Finally, parametric studies of reinforcement parameters indicated that 1.5–2.0 times the initial elastic modulus and cohesive force of soil should be used for reinforcement. It is recommended that the ranges for pile diameter, pile spacing, anchor cable prestressing and inclination angle should be selected as 0.8–1.2 m, 1.4–2.0 m, 100–150 kN, and 10°–20°, respectively.

Research on the Construction Monitoring for Enclosure Structure of Working well

2014 ◽  
Vol 580-583 ◽  
pp. 797-800
Author(s):  
Yuan Liao ◽  
Jian Hui Zhan ◽  
Chen Li
Keyword(s):  
Theoretical Analysis ◽  
Horizontal Displacement ◽  
Internal Force ◽  
River Channel ◽  
Test Results ◽  
Foundation Pit ◽  
Construction Monitoring ◽  
Monitoring Scheme ◽  
Axial Forces ◽  
Nanjing City

Working well of nanjing city latitude three pass by river channel project is taken for example. Underground continuous wall was adopted in this project. Detailed monitoring scheme was formulated and lots of date was obtained by foundation pit. The monitoring data changed sharply analysis shows that the maximum horizontal displacement and the maximum strut axial forces is located near the excavation surface and along with the soil excavating. After structure construction, the change of deformation and internal force of enclosure structure gradually became stable. The theoretical analysis and test results are tend to be consistent. But this two have certain differences due to the influence of various factors.

Study on Superposition Impact and Hazard Control of Surrounding Environment in the Process of Complex Foundation Pit Excavation

2013 ◽  
Vol 353-356 ◽  
pp. 1592-1596
Author(s):  
Tao Liu ◽  
Xiao Wei Wang ◽  
Xue Fu Pan
Keyword(s):  
Control Measures ◽  
Deep Foundation ◽  
Foundation Pit ◽  
Deep Foundation Pit ◽  
Surrounding Environment ◽  
Hazard Control ◽  
Information Construction ◽  
Complex Foundation ◽  
Numerical Calculation Method ◽  
Prevention Methods

In this paper, through theoretical analysis and finite element of numerical calculation method, superimposed influence effect in the process of typical complex foundation pit group excavation was analysis and research. Put forward hazard prevention methods aim at the superposition effect in the process of construction, at the same time, the information construction means monitoring is conducted to be verified. Results show that, the relevant control measures was effectively control the displacement of deep foundation pit and surrounding environment.

The Analysis on the Deformation Predition of Pile-Anchor Retaining Structure in Deep Foundation Pit in Kunming

2012 ◽  
Vol 166-169 ◽  
pp. 1222-1225 ◽  
Author(s):  
Yin Hui Chen ◽  
Yu Wen Wang
Keyword(s):  
Horizontal Displacement ◽  
Deformation Characteristics ◽  
Deep Foundation ◽  
Foundation Pit ◽  
Maximum Displacement ◽  
Deep Foundation Pit ◽  
Retaining Structure ◽  
Information Construction ◽  
Practical Engineering ◽  
Important Means

This article from deformation characteristics of deep foundation pit which support by the pile anchor, then using neural network and Matlab software to establish the time series model to prediction and analysis the deep horizontal displacement of soil. The prediction results show that the overall shape of the curve is similar to "bow” ,and with the depth of excavation the maximum displacement occurred by the beginning of the location of 0.5 m from the surface to move to about half of the excavation depth That is the H/2 up and down position. The results have some reference to the practical engineering in a certain extent, this explain that the prediction is a kind of important means to realize information construction.

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