Three-dimensional back-analysis method for the mechanical parameters of the new ground ahead of a tunnel face

2008 ◽  
Vol 23 (4) ◽  
pp. 373-380 ◽  
Author(s):  
M. Hisatake ◽  
Y. Hieda
Keyword(s):  
Three Dimensional ◽  
Back Analysis ◽  
Mechanical Parameters ◽  
Analysis Method ◽  
Tunnel Face

An interpretation of ground movements recorded during construction of the Donkin-Morien tunnel

1991 ◽  
Vol 28 (2) ◽  
pp. 239-254 ◽  
Author(s):  
F. Pelli ◽  
P. K. Kaiser ◽  
N. R. Morgenstern
Keyword(s):  
Three Dimensional ◽  
Back Analysis ◽  
Tunnel Boring Machine ◽  
Laboratory Measurements ◽  
Tunnel Face ◽  
Tunnel Boring ◽  
Deformation Properties ◽  
Dimensional Finite Element ◽  
Strength And Deformation ◽  
Three Dimensional Finite Element

A tunnel excavated by a tunnel boring machine was monitored extensively by means of extensometers installed near the tunnel face. Consequently, the three-dimensional state existing at the time of installation must be considered for the interpretation of the monitoring data. Results from three-dimensional finite element simulations are used to back-calculate rock mass strength and deformation properties. The purpose of this study was to establish and test various approaches of back-analysis. Results are compared with field and laboratory measurements. On the basis of these analyses, the paper provides guidance on how field data can be used for back-analysis purposes even when the ground behaves in a nonelastic manner. Key words: tunnelling, monitoring, tunnel boring, back-analysis, nonlinearity.

The Mechanical Parameters of a Rock Slope Displacement Back Analysis Based on the Orthogonal Test Design

2012 ◽  
Vol 256-259 ◽  
pp. 207-210
Author(s):  
Chun Lai Qu ◽  
Ke Jiang ◽  
Min Xue ◽  
Zhao Cai Zhang
Keyword(s):  
Three Dimensional ◽  
Back Analysis ◽  
Orthogonal Test ◽  
Mechanical Parameters ◽  
The Neural Network ◽  
Measurement Results ◽  
Orthogonal Test Design ◽  
Slope Treatment ◽  
Slope Displacement ◽  
The Relationship

The mechanics parameters of a slope are difficult to determine accurately by conventional methods, because of weathering, fracture and excavation induced stress release. Based on the orthogonal test and three-dimensional numerical calculation to get the learning samples of displacement, By using the neural network method to obtain the relationship between the mechanical parameters and displacement, Combined with measurement results of deformation in the field mining, Obtained the reasonable strata parameters to provide the basis for slope treatment.

IDE-MLSSVR-Based Back Analysis Method for Multiple Mechanical Parameters of Concrete Dams

2020 ◽  
Vol 146 (8) ◽  
pp. 04020155
Author(s):  
Tengfei Bao ◽  
Jianming Li ◽  
Yuanfu Lu ◽  
Chongshi Gu
Keyword(s):  
Back Analysis ◽  
Mechanical Parameters ◽  
Concrete Dams ◽  
Analysis Method

Back Analysis for Rock Mechanical Parameters and Calculation of Ground Stress Based on GA-FLAC3D

2012 ◽  
Vol 462 ◽  
pp. 468-473
Author(s):  
Ze Zhang ◽  
Tong Bin Zhao ◽  
Yun Liang Tan ◽  
Chong Guang Zhang
Keyword(s):  
Genetic Algorithm ◽  
Deep Level ◽  
Back Analysis ◽  
In Situ Stress ◽  
Mechanical Parameters ◽  
Analysis Method ◽  
Stress Relieving ◽  
Ground Stress ◽  
Rock Mechanical Parameters

In order to obtain the stress distribution in deep level of Datai mine, a nonlinear back analysis method for rock mechanical parameters was proposed by combining genetic algorithm and FLAC3D (GA-FLAC3D). First the hollow inclusion stress gauge (stress relieving method) was used to complete the measurement of local in-situ stress; and then the rock mechanical parameters were obtained by using back analysis; at last the ground stress in deep level was obtained. The results showed, this method is quick in calculation, and has global convergence. The convergence accuracy of normal stress is about 90%.

Study the Impact of Differential Settlement on Frame Structure through Back-Analysis Method

2013 ◽  
Vol 671-674 ◽  
pp. 799-803
Author(s):  
Nan Jiang ◽  
Li Ming Huang
Keyword(s):  
Three Dimensional ◽  
Back Analysis ◽  
Bending Moment ◽  
Measured Data ◽  
Differential Settlement ◽  
Frame Structure ◽  
Analysis Method ◽  
Piled Raft Foundation ◽  
The Impact ◽  
Pile Length

This paper studied the impact of differential settlement of foundation on the inner force of architectural structure by applying back-analysis method. By taking the three-dimensional coactions system of upper structure-piled raft foundation-foundation with different pile length and different raft thickness as the research object, its differential settlement law of foundation under the effect of load was studied, which was combined with the practical measured data to fit the quadratic settlement surface equation of the foundation. The analysis demonstrated that the differential settlement of foundation will change the inner force of upper structure significantly, thus enabling most of construction components to produce great additional axial force, additional shearing force and additional bending moment, especially changing the additional inner force of corner post more evidently.

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