Vertical Displacement Accuracy Analysis of Foundation Pit Monitoring

2014 ◽  
Vol 608-609 ◽  
pp. 895-898
Author(s):  
Guang Zhang ◽  
Chang Chuan Chen ◽  
Yi Wen Yang ◽  
Xiu Ling Jiang
Keyword(s):  
Influence Factors ◽  
Vertical Displacement ◽  
High Light Intensity ◽  
Worker Safety ◽  
Monitoring Data ◽  
Deep Foundation ◽  
Foundation Pit ◽  
Monitoring Point ◽  
Deep Foundation Pit ◽  
Practical Engineering

Foundation pit monitoring requirement for data accuracy is very high, especially the deep foundation pit. Monitoring data accurate or not directly related to the project of construction safety and worker safety. This paper analyzes the influence factors of foundation pit vertical displacement monitoring, Combined with practical engineering to improve the accuracy of monitoring, the conclusion: Reasonable layout of monitoring point reasonable ,Fixed observers,Fixed level and matched leveling rod,Take an umbrella when high light intensity,Observation in construction vibration is small, such measures can effectively improve the accuracy of monitoring data

scholarly journals Deformation prediction analysis of vertical displacement of deep foundation pit based on LIBSVM

2020 ◽  
Vol 206 ◽  
pp. 01021
Author(s):  
Yueyao Zhao ◽  
Jiawei Zhang ◽  
Haojie Li
Keyword(s):  
Support Vector Machine Model ◽  
Hot Spot ◽  
Vertical Displacement ◽  
Support Vector ◽  
Deep Foundation ◽  
Foundation Pit ◽  
Machine Model ◽  
Deformation Prediction ◽  
Deep Foundation Pit ◽  
Good Agreement

The reliable prediction of the surface vertical displacement deformation of deep foundation pits is of great significance to the excavation of large foundation pits. The support vector machine model (LIBSVM) has become a hot spot in the prediction of deep foundation pit deformation and provides a new prediction for the deformation of deep foundation pits. In this paper, taking the deep foundation pit of Daoxianghu Road Station in xx as an example, a prediction model of vertical displacement on the ground is established based on LIBSVM and analysis shows that the prediction results based on the model are in good agreement with the measured data, and the MSE reaches 0.0323. The model is effective and has an effective prospective skill.

scholarly journals Study on Flexural Bearing Capacity Calculation Method of Enclosure Pile with Partial Excision in Deep Foundation Pit

2019 ◽  
Vol 2019 ◽  
pp. 1-10 ◽  
Author(s):  
Mingfeng Lei ◽  
Linghui Liu ◽  
Yuexiang Lin ◽  
Jin Li
Keyword(s):  
Flexural Strength ◽  
Bearing Capacity ◽  
Calculation Method ◽  
Deep Foundation ◽  
Foundation Pit ◽  
Theoretical Derivation ◽  
Deep Foundation Pit ◽  
Practical Engineering ◽  
Capacity Calculation ◽  
Partial Excision

During deep foundation pit construction, the structural clearance intrusion, which is caused by the complex formation conditions and the inefficient drilling equipment, is usually detected due to the vertical deviation of piles. To meet construction requirements, pile parts intruding into the structural clearance are supposed to be excised. However, the sectional flexural strength of the pile is bound to decrease with partial excision, which would reduce the bearing capacity of the enclosing structure during construction. In this paper, a theoretical derivation of the normal sectional flexural strength of the partially excised circular pile is proposed. The derivation adopts the assumption of the plane section and steel ring equivalence and can be solved by the bisection method. Furthermore, the calculation method is applied to the pile evaluation of a practical engineering; also, the method is verified by the numerical method. The application results show that the excision of rebar and pile’s sectional area will cause a rapid linear decline in the sectional flexural strength. After excising 18 cm radial thickness of the circular pile (ϕ800 mm) and 6 longitudinal rebars, the sectional flexural strength of the pile decreases to 58% from the origin, which cannot meet the support requirement. The analysis indicates that pile reinforcements must be carried out to maintain the construction safety.

Analysis on the Design and Application of Prestressed Concrete Supporting Piles

2010 ◽  
Vol 44-47 ◽  
pp. 173-176
Author(s):  
Dong Ming Yu ◽  
Zhi Qin Liu ◽  
Feng Guang Chen
Keyword(s):  
Prestressed Concrete ◽  
Deep Foundation ◽  
Engineering Project ◽  
Foundation Pit ◽  
Deep Foundation Pit ◽  
Concrete Piles ◽  
Adjacent Building ◽  
Practical Engineering ◽  
Concrete Materials ◽  
Actual Settlement

The supporting piles of deep foundation pits are usually made in reinforced concrete materials and rarely in prestressed concrete materials. But prestressed concrete materials have higher stiffness and less deformation and are suitable for controlling displacements or settlements. So, in this paper a practical engineering project as an example, the prestressed concrete supporting piles of the deep foundation pit are calculated and designed. Then, the settlement and inclination of the building adjacent the foundation pit with the prestressed concrete piles are calculated in the numerical software, FLAC. The results calculated in FLAC are compared with the actual settlement and inclination of the adjacent building during the foundation pit is excavated. The comparison confirms the feasibility of the supporting structure. This is a useful trial on the design of the prestressed concrete supporting piles.

Monitoring and Analysis on the Supporting Structure for Deep Foundation Pit

2014 ◽  
Vol 580-583 ◽  
pp. 787-790
Author(s):  
Hai Xia Sun ◽  
Ke Zhang ◽  
Si Li Chen
Keyword(s):  
In Situ Monitoring ◽  
Monitoring Data ◽  
Deep Foundation ◽  
Foundation Pit ◽  
Metro Station ◽  
Deep Foundation Pit ◽  
Supporting Structure ◽  
Deformation Features ◽  
The Stability

This article mainly expounds the importance of in-situ monitoring on the construction process of deep foundation pit. Taking the deep foundation pit of some Shenyang metro station for example, the deformation features of the supporting structure and the internal and external of foundation pit is analyzed, according to the monitoring data of the fender pile displacement during the excavation of deep foundation pit. The conclusion is obtained that the timely and accurate in-situ monitoring information is necessary to guaranteeing construction safety. We should pay more attention to the excavation speed and exert the interior support timely during the excavation of foundation pit to avoid large deformation and danger. The analytical results of monitoring data shows that the whole stage of foundation pit excavation is stable and the fender pile with internal supports can guarantee the stability of foundation pit.

Research on Application of Deep Foundation Pit Decompression Dewatering Technology and Impact on Surrounding Environment

2013 ◽  
Vol 671-674 ◽  
pp. 101-104
Author(s):  
Dong Dong Zhang ◽  
Jun Wen Ding ◽  
Rong Biao Wang
Keyword(s):  
Engineering Application ◽  
Pumping Test ◽  
Rail Transit ◽  
Deep Foundation ◽  
Foundation Pit ◽  
Deep Foundation Pit ◽  
Hydrogeological Parameters ◽  
Surrounding Environment ◽  
Practical Engineering ◽  
Research On Application

The studies application of deep foundation pit decompression technology focusing on special engineering geological and hydrogeological conditions. Taking foundation pit dewatering of certain rail transit station as an example, designs deep foundation pit decompression precipitation technology scheme with hydrogeological parameters obtained through pumping test, and assesses and monitors its impacts on surrounding environment according to measured data on project site, which has achieved good results in practical engineering application and provides foundation for construction of rail transit lines.

Study on Engineering Materials with the Comparison and Discussion of Support Scheme in a Foundation Pit

2013 ◽  
Vol 788 ◽  
pp. 623-626
Author(s):  
Zheng Zhen ◽  
Ren Wang Liang
Keyword(s):  
Numerical Simulation ◽  
Shear Force ◽  
Simulation Analysis ◽  
Bending Moment ◽  
Engineering Material ◽  
Deep Foundation ◽  
Foundation Pit ◽  
Cost Performance ◽  
Deep Foundation Pit ◽  
Practical Engineering

Taking a deep foundation pit engineering in Taiyuan as research background, this paper used two different supporting structure of foundation pit to make numerical simulation analysis by using Li zheng software. The engineering material had high cost performance. In addition, the paper studied the displacement, bending moment, shear force with the change of the excavation depth, and it came to the conclusion that some outcome can be used for reference in the practical engineering.

Compared Analysis of Deformation Monitoring with Numerical Simulation on Pile-Anchor Supporting System of Deep Foundation Pit in Soil-Rock Dualistic Area

2013 ◽  
Vol 353-356 ◽  
pp. 3598-3605
Author(s):  
Xiao Dong Yi ◽  
Peng Huang ◽  
Zhi Chao Wang
Keyword(s):  
Deformation Monitoring ◽  
Deep Foundation ◽  
Foundation Pit ◽  
Dual Structure ◽  
Deep Foundation Pit ◽  
Finite Element Software ◽  
Whole Process ◽  
Practical Engineering ◽  
Similar Location ◽  
Design Construction

Deep foundation pit supporting in soil-rock areas has been occurred commonly in Dalian. In the dual structure deep foundation pit in which platform is reserved, pile-anchor support as a typical form of foundation pit support, how to play its role effectively and make the design economical and safety is the subject which was explored continuously in recent years. Through a practical engineering case, this paper will use finite element software ABAQUS to simulate the whole process of pit excavation. Simulation results show that the boundary of the dual structure is the key position that caused the “sharp deformation” of the supporting structure. Compared with monitoring data, the results indicate that the reliability of the numerical model and the relevant deformation laws are verified, which can be used for the reference for the design, construction and monitoring of the deep foundation pit support in the similar location.

Finite Element Analysis of Utility Pipe Tunnel Affected by Adjacent Deep Excavation

2011 ◽  
Vol 368-373 ◽  
pp. 1327-1331
Author(s):  
Wei Min Qiu ◽  
Hai Lin Zhang ◽  
Gang Wang
Keyword(s):  
Finite Element ◽  
Simulation Analysis ◽  
Underground Structure ◽  
Vertical Displacement ◽  
Practical Significance ◽  
Deep Excavation ◽  
Deep Foundation ◽  
Foundation Pit ◽  
Deep Foundation Pit ◽  
Finite Element Software

With the development of urban construction, deep large pits are often located at intensive underground structure area, and the utility pipe tunnel within various pipelines is the lifeline engineering of urban environment .Thus, there is the very necessary practical significance to research on utility pipe tunnel influenced by adjacent deep Excavation. Using large finite element software ANSYS, we analysis the problem with the deep foundation pit, support system, the soil around and adjacent tubes as an entirety. In considering of the mutual interaction between support structure and soil, as well as the element birth-death technology and restart analysis technology, the deep foundation pit mode is simulated and analyzed according to the actual construction process, including the gravity initial stress analysis and the simulation analysis on the each layer soil excavation. After simulation analysis the level of utility pipe tunnel’s horizontal and vertical displacement environment in different affecting factors and reinforcement measures, it is concluded that the law of utility pipe tunnel’s horizontal and vertical displacement, further the reasonable economic measure is put forward to protect the safety of the utility pipe tunnel. Therefore the conclusion has certain reference value for designing the foundation pit construction and the protection measures on the adjacent utility pipe tunnel.

Discussion on the Control and Monitoring of Groundwater in Deep Foundation Pit Engineering

2020 ◽  
Vol 5 (1) ◽  
pp. 14-16
Author(s):  
Jingyi Zhang ◽  
◽  
Hefei Li ◽  
Jie Yang ◽  
Xupeng Zhang ◽  
...  
Keyword(s):  
Finite Element ◽  
Working Conditions ◽  
Monitoring Data ◽  
Ground Settlement ◽  
Deep Foundation ◽  
Foundation Pit ◽  
Deep Foundation Pit ◽  
Finite Element Software ◽  
Important Observation ◽  
Excavation Support

Ground settlement is very important in the settlement of foundation pit soil, and this index is an important observation index. By comparing the results of the foundation pit deformation simulated by the MIDAS GTS/NX finite element software with the actual monitoring data, the deep foundation pit dewatering construction excavation support simulation under different working conditions is analyzed, and the deep foundation pit deformation is analyzed.

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