Time-dependent behavior of tunnel lining in weak rock mass based on displacement back analysis method

2013 ◽  
Vol 38 ◽  
pp. 348-356 ◽  
Author(s):  
Mostafa Sharifzadeh ◽  
Abolfazl Tarifard ◽  
Mohammad Ali Moridi
Keyword(s):  
Rock Mass ◽  
Back Analysis ◽  
Tunnel Lining ◽  
Time Dependent ◽  
Weak Rock ◽  
Analysis Method ◽  
Dependent Behavior ◽  
Displacement Back Analysis ◽  
Weak Rock Mass

Longitudinal deformation profile of a tunnel in weak rock mass by using the back analysis method

2018 ◽  
Vol 71 ◽  
pp. 478-493 ◽  
Author(s):  
Yanbin Luo ◽  
Jianxun Chen ◽  
Yi Chen ◽  
Pengsheng Diao ◽  
Xiong Qiao
Keyword(s):  
Rock Mass ◽  
Back Analysis ◽  
Weak Rock ◽  
Analysis Method ◽  
Longitudinal Deformation ◽  
Weak Rock Mass

Numerical Analysis of Time Dependent Behavior for Celadon Clay Rock

2013 ◽  
Vol 353-356 ◽  
pp. 1067-1072
Author(s):  
Lian Xing Hu ◽  
Yi Lin Fan ◽  
Xiang Dong Zhu
Keyword(s):  
Back Analysis ◽  
Time Dependent ◽  
Clay Rock ◽  
Analysis Method ◽  
Time Dependency ◽  
Dependent Behavior ◽  
Good Consistency ◽  
Dam Site ◽  
The Stability ◽  
Test Hole

A dam site, whose main rock is celadon clay rock, has an obvious time-efficient behavior in the respect of displacement and mechanics from the field observation. This feature has a certain effect to the safety of the dam site. In order to simulate the characteristic of time dependency of this rock with numerical method, this paper first use the monitoring data of test hole to determine the constitutive model, then the rock mechanics parameters were obtained by back analysis method. The results show that there is a good consistency between numerical modeling and field monitoring. This achievement can be used to analysis the stability of project dam.

Back Analysis Methods in Geotechnical Engineering

2014 ◽  
Vol 1020 ◽  
pp. 423-428 ◽  
Author(s):  
Eva Hrubesova ◽  
Marek Mohyla
Keyword(s):  
Rock Mass ◽  
Geotechnical Engineering ◽  
Back Analysis ◽  
Rheological Parameters ◽  
Analysis Method ◽  
Direct Optimization ◽  
Initial Stress State ◽  
Analytical Functions ◽  
Is Evaluation

The paper deals with the back analysis method in geotechnical engineering, that goal is evaluation the more objective and reliable parameters of the rock mass on the basis of in-situ measurements. Stress, deformational, strength and rheological parameters of the rock mass are usually determined by some inaccuracies and errors arising from the complexity and variability of the rock mass. This higher or lower degree of imprecision is reflected in the reliability of the mathematical modelling results. The paper presents the utilization of direct optimization back analysis method, based on the theory of analytical functions of complex variable and Kolosov-Muschelischvili relations, to the evaluation of initial stress state inside the rock massif.

scholarly journals Approach for Optimisation of Tunnel Lining Design

2020 ◽  
Vol 10 (19) ◽  
pp. 6705
Author(s):  
Marek Mohyla ◽  
Karel Vojtasik ◽  
Eva Hrubesova ◽  
Martin Stolarik ◽  
Jan Nedoma ◽  
...  
Keyword(s):  
Rock Mass ◽  
Numerical Models ◽  
Tunnel Lining ◽  
Time Dependent ◽  
Design Element ◽  
Heterogeneous Structure ◽  
Underground Engineering ◽  
Software Application ◽  
Tunnel Lining Design ◽  
Dependent Property

This paper presents an approach that enables the specific characteristics of a primary tunnel lining implemented using numerical modelling to be taken into account during its design. According to the fundamental principles of the New Austrian Tunnelling Method, the primary lining undergoes time-dependent deformation, which is determined by its design. The main design element is shotcrete, which, shortly after its application, interacts with the surrounding rock mass and steel arch frame. The primary lining ensures the equilibrium stress–strain state of “rock mass–tunnel lining” during excavation. The structural interaction varies depending on the hardening of the shotcrete, the rheological properties of the rock mass, and other factors. The proposed approach uses the Homogenisation software application, which was developed by the Faculty of Civil Engineering at the Department of Geotechnics and Underground Engineering of the VSB—Technical University of Ostrava. This software allows the heterogeneous structure of the lining to be considered by replacing it with a homogenous structure. The parameters of the homogeneous primary lining, which take into account the steel reinforcement elements and the time-dependent property of the shotcrete, are included in numerical models.

scholarly journals An analysis on the slaking and disintegration extent of weak rock mass of the water tunnels for hydropower project using modified slake durability test

2019 ◽  
Vol 79 (4) ◽  
pp. 1919-1937 ◽  
Author(s):  
Lena Selen ◽  
Krishna Kanta Panthi ◽  
Gunnar Vistnes
Keyword(s):  
Rock Mass ◽  
Test Method ◽  
Weak Rock ◽  
Hydropower Project ◽  
Durability Test ◽  
Slake Durability ◽  
Operational Life ◽  
Heterogeneous Rock ◽  
Weak Rock Mass ◽  
Slake Durability Test

AbstractWater tunnels built for hydropower passing through weak and heterogeneous rock mass pose challenges associated to slaking and disintegration, as they are first exposed to dry condition during excavation and are then filled with water to produce hydropower energy. Over the period of operational life, these tunnels are drained periodically for inspections and repair leading to drainage and filling cycles. The weakening of rock mass caused by cycles of drying, saturation and drainage may lead to the propagation of instabilities in the tunnels. Therefore, it is important to study the slaking and disintegration behavior of the weak rock mass consisting of clay and clay-like minerals. This paper assesses the mineralogical composition of flysch and serpentinite from the headrace tunnel of Moglicë Hydropower Project in Albania. Further, to determine the slaking and disintegration behavior of these rocks, extensive testing using both the ISRM, Int J Rock Mech Min Sci Geomech Abstr 16(2):143-151, (1979) suggested test method and a modified variant of this test are performed. Finally, comprehensive assessments, discussions and comparisons are made. It is found that the modified slake durability test better suits for the tunnels built as water conveying systems such as hydropower tunnels.

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