Analytical solution of energy redistribution in rectangular openings upon in-situ rock mass alteration

The time-dependent behavior of rock mass, which is generally governed by joints and shearing zones, is of great significance for engineering design and prediction of long-term deformation and stability. In situ creep test is a more effective method than laboratory test in characterizing the creep behavior of rock mass with joint or shearing zone due to the complexity of field conditions. A series of in situ creep tests on granite with joint at the shiplock area of the Three-Gorges Project and basalt with shearing zone at the right abutment of the Xiluodu Project were performed in this study. Based on the test results, the stress-displacement-time responses of the joints and basalt are analyzed, and their time-dependent constitutive model and model coefficients are given, which is crucial for the design to prevent the creep deformations of rock masses from causing the failure of the operation of the shiplock gate at the Three-Gorges Project and long-term stability of the Xiluodu arc dam.

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Analysis of TBM Tunnel Behavior in Jointed Rock Mass

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.90-93.2033 ◽

2011 ◽

Vol 90-93 ◽

pp. 2033-2036 ◽

Cited By ~ 1

Author(s):

Jin Shan Sun ◽

Hong Jun Guo ◽

Wen Bo Lu ◽

Qing Hui Jiang

Keyword(s):

Rock Mass ◽

Numerical Models ◽

Jointed Rock ◽

In Situ Stress ◽

Jointed Rock Mass ◽

Joint Orientation ◽

Joint Spacing ◽

Factors Affecting ◽

Dip Angle

The factors affecting the TBM tunnel behavior in jointed rock mass is investigated. In the numerical models the concrete segment lining of TBM tunnel is concerned, which is simulated as a tube neglecting the segment joint. And the TBM tunnel construction process is simulate considering the excavation and installing of the segment linings. Some cases are analyzed with different joint orientation, joint spacing, joint strength and tunnel depth. The results show that the shape and areas of loosing zones of the tunnel are influenced by the parameters of joint sets and in-situ stress significantly, such as dip angle, spacing, strength, and the in-situ stress statement. And the stress and deformation of the tunnel lining are influenced by the parameters of joint sets and in-situ stress, too.

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Post-test assessment of simulations for in situ heater tests in basalt — Part I. Heater test description and rock mass properties

International Journal of Rock Mechanics and Mining Sciences & Geomechanics Abstracts ◽

10.1016/0148-9062(91)93382-g ◽

1991 ◽

Vol 28 (1) ◽

pp. A18

Keyword(s):

Rock Mass ◽

Rock Mass Properties ◽

Mass Properties ◽

Test Assessment ◽

Post Test

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Back Analysis Methods in Geotechnical Engineering

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.1020.423 ◽

2014 ◽

Vol 1020 ◽

pp. 423-428 ◽

Cited By ~ 2

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.

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Study on Deformation and Damage of Rock Mass Subject to High In Situ Stress by Using a Elastoplastic Damage Model and Considering the Impact of Weak Planes

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.838-841.705 ◽

2013 ◽

Vol 838-841 ◽

pp. 705-709

Author(s):

Yun Hao Yang ◽

Ren Kun Wang

Keyword(s):

Rock Mass ◽

Large Scale ◽

Damage Model ◽

Back Analysis ◽

In Situ Stress ◽

Surrounding Rock ◽

High In Situ Stress ◽

Underground Caverns ◽

The Impact

Large scale underground caverns are under construction in high in-situ stress field at Houziyan hydropower station. To investigate deformation and damage of surrounding rock mass, a elastoplastic orthotropic damage model capable of describing induced orthotropic damage and post-peak behavior of hard rock is used, together with a effective approach accounting for the presence of weak planes. Then a displacement based back analysis was conducted by using the measured deformation data from extensometers. The computed displacements are in good agreement with the measured ones at most of measurement points, which confirm the validities of constitutive model and numerical simulation model. The result of simulation shows that damage of surrounding rock mass is mainly dominated by the high in-situ stress rather than the weak planes and heavy damage occur at the cavern shoulders and side walls.

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