Construction measuring and deformation analysis of foundation pit in deep silt soil layer under complicated environment

2018 ◽  
Vol 18 (1) ◽  
pp. 167-185
Author(s):  
JIANHUI YANG ◽  
DEHI KONG
Keyword(s):  
Soil Layer ◽  
Deformation Analysis ◽  
Foundation Pit

Alternative Mesh Refinement Methods for Analysing Soil Penetration Problems

2016 ◽  
Vol 846 ◽  
pp. 415-420
Author(s):  
M.H. Moavenian ◽  
Majidreza Nazem ◽  
John Phillip Carter
Keyword(s):  
Soil Layer ◽  
Deformation Analysis ◽  
Deep Penetration ◽  
Arbitrary Lagrangian Eulerian ◽  
The Finite Element Method ◽  
Mesh Distortion ◽  
B Splines ◽  
Arbitrary Lagrangian Eulerian Method ◽  
Complex Boundary ◽  
Free Falling

Despite recent advances in the finite element method, mesh distortion due to large deformations may still occur in some problems such as footings subjected to deep penetration or objects penetrating into a soil layer. In order to overcome mesh distortion, robust remeshing techniques are required. In this paper the performance of four remeshing methods is studied by analysing a free falling penetrometer penetrating into an undrained layer of soil. These techniques are implemented within the framework of the Arbitrary Lagrangian-Eulerian method and include the refinement based on an elastic relocation, a technique based on the Radial Basis Functions, the Spring Analogy method, and the Elastic Hardening method. Since one of the challenging problems in a large deformation analysis is dealing with complex boundary shapes, a scheme based on the B-Splines used in isogeometric analysis is also presented here.

Study on Mechanical Behaviors of Underground Pipelines Due to Excavation of Foundation Pit

2011 ◽  
Vol 243-249 ◽  
pp. 2065-2070
Author(s):  
Run Lin Yang ◽  
Juan Juan Wang ◽  
Hai Cheng Zhou
Keyword(s):  
Numerical Simulation ◽  
Comparative Analysis ◽  
Soil Layer ◽  
Mechanical Behaviors ◽  
Foundation Pit ◽  
Underground Pipelines ◽  
Two Factors ◽  
Stress And Deformation ◽  
Ground Load

It is necessary to study the mechanic behavior of underground pipelines during the excavation of the foundation pit, because the excavation will inevitably endanger the nearby underground pipelines. Three factors include the depth of underground pipelines, the distance from the pipeline to the foundation pit and ground load are considered to conform comparative analysis, in order to study the variaty on the stress and deformation of the underground pipelines. The foundation surporting type and the soil layer distribution are also considered during the numerical simulation. The results show that the distance between pipeline and foundation has more influence on the underground pipelines than other two factors, the damage most likely occurred in the bottom right in the pipeline near the foundation pit.

Internal Force and Deformation Analysis of Pile-Brace Support Structure of Foundation Pit Considering Deformation Compatibility

2011 ◽  
Vol 90-93 ◽  
pp. 446-452
Author(s):  
Chang Jie Xu ◽  
Zhi Yuan Luo
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Internal Force ◽  
Deformation Analysis ◽  
Support Structure ◽  
Foundation Pit ◽  
Simplified Calculation ◽  
Deformation Compatibility ◽  
Horizontal Displacements ◽  
Element Method

For the current simplified calculation of pile-brace support structure can not calculate the displacements of pile and brace, the authors try to start from the deflection differential equation of beam on elastic foundation, considering the deformation compatibility of pile and brace, and obtains the internal forces and displacements of pile by using Finite Difference Method. Meanwhile, Finite Element Method is used to analyze and calculate the horizontal displacements of pile. The results show that the values obtained by this article are closer to the measured values than that obtained by Finite Element Method. The method is accurate, reliable and simple. Besides, this author also analysis the different horizontal displacements of pile under different parameter conditions of support structure, which can provide some valuable suggestions for the design of foundation pit.

Application of Prestressed Anchor Composite Soil Nail Wall in Deep Foundation Pit Engineering at Lanzhou Region

2014 ◽  
Vol 1030-1032 ◽  
pp. 714-718
Author(s):  
Hui Tao
Keyword(s):  
Soil Layer ◽  
Horizontal Displacement ◽  
Deep Foundation ◽  
Foundation Pit ◽  
Soil Nails ◽  
Change Rate ◽  
Deep Foundation Pit ◽  
Soil Nail ◽  
Support Engineering ◽  
Prestressed Anchor

The paper introduces the application of prestressed anchors and soil nails support system in complex soil layer deep foundation pit engineering at Lanzhou region based on the deep foundation pit engineering in Gansu Provincial Hospital of TCM as the background and discusses its key technology. The effect shows that scheme of the design of foundation pit support engineering is reasonable and effective.The engineering meets requirements of design and environment.The monitoring results show that prestressed anchors can control the horizontal displacement and the change rate of slope′s vertical settlement effectively. The experience of engineering is significance for similar engineerings at Lanzhou region.

Analyzing the Excavation of Fluid-Solid Coupling Foundation Pit Based on 3D Numerical Simulation and GA-ANN

2010 ◽  
Vol 171-172 ◽  
pp. 394-398
Author(s):  
An Nan Jiang ◽  
Jun Xiang Wang ◽  
Lin Bo Hou
Keyword(s):  
Numerical Simulation ◽  
Orthogonal Design ◽  
Soil Layer ◽  
Soil Parameters ◽  
3D Numerical Simulation ◽  
Foundation Pit ◽  
Feedback Analysis ◽  
Engineering Construction ◽  
Sample Data ◽  
Bp Neural Network Model

Aiming at the complexity mechanism of foundation pit excavation, the paper proposed a feedback analysis flow combining 3D numerical simulation, orthogonal design, artificial neural networks(ANN) and genetic algorithm(GA). The sample data are produced by numerical simulation based on seepage theory and Biot consolidation theory, reflecting the interaction of hydraulics and mechanics. The BP neural network model is trained by above sample data and is optimized by GA, which can map the relation between soil layer parameters and character monitoring displacements well. Based on the relation, the soil parameters could be identified by GA. The method has been applied to analyze the Suzhou Runjie square foundation pit excavation and the permeability coefficients of soil layers were identified. The fluid-solid coupling process of foundation pit excavation based on inversion parameters are simulated. It indicates that the method can get satisfied precision, which provides guide meaning to specific engineering construction and appraisal.

The Numerical Simulation and Deformation Analysis to the Deep Foundation Pit of Diaphragm Wall Based on Midas/GTS

2015 ◽  
Vol 733 ◽  
pp. 456-459
Author(s):  
Jin Jun Liang ◽  
Fei Wang ◽  
Ya Wen Liu ◽  
Xing Yuan Sun
Keyword(s):  
Deformation Analysis ◽  
Deep Foundation ◽  
Foundation Pit ◽  
Deep Foundation Pit ◽  
Traffic System ◽  
Finite Element Software ◽  
Excavation Process ◽  
Connection Line ◽  
Calculation Results ◽  
Adjacent Soil

Taking the J2 area YK10+615~YK10+650 miles section related to the connection line of River-crossing tunnel to Nanjing plum delta--the youth Olympic axis underground traffic system engineering as the background, the 3d model is established by using finite element software MIDAS/GTS, the mileage period of excavation process is simulated, discuss the influence of excavation on adjacent soils. Calculation results show that the excavation will inevitably cause deformation of adjacent soil, and comparing the results of calculate and the actual monitoring data show that the method has certain guiding significance to actual engineering.

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