Application of Damage Rheology Model in Study on an Underground Cavern Group

2011 ◽  
Vol 90-93 ◽  
pp. 760-763
Author(s):  
Yin Ping Qi ◽  
Lv Xiang ◽  
Wei Shen Zhu
Keyword(s):  
Large Scale ◽  
Southwest China ◽  
Back Analysis ◽  
Great Depth ◽  
Underground Cavern ◽  
In Situ Stresses ◽  
The Stability ◽  
Damage Rheology ◽  
Hydropower Stations

A great number of large-scale hydropower stations are to be constructed in southwest China. Many of them feature great depth or high in situ stresses. In this paper, a coupled damage and rheology method is adopted for stability analysis of an underground cavern group with time effect to consider the rock deformation. Meanwhile, a new method considering the crackopening displacement is used for back analysis. The stability of the surrounding rock masses is then evaluated.

Development of ultrasonic methods for measuring in-situ stresses at great depth

1983 ◽  
Vol 1 (1) ◽  
pp. 21-42 ◽  
Author(s):  
W.H. Su ◽  
S.S. Peng ◽  
S. Okubo ◽  
K. Matsuki
Keyword(s):  
Great Depth ◽  
Ultrasonic Methods ◽  
In Situ Stresses

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

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.

Research on Back Analysis of Parameters for Excavation of the Underground Cavern Group of a Large-Scale Hydro-Power Station by Using Orthogonal Optimization

2012 ◽  
Vol 170-173 ◽  
pp. 3356-3360
Author(s):  
Wen Dong Yang ◽  
Xi Chao Gao ◽  
Yan Mei Zhang ◽  
Jia Yang ◽  
Gang Wang ◽  
...  
Keyword(s):  
Rock Mass ◽  
Large Scale ◽  
Back Analysis ◽  
Element Model ◽  
Optimization Method ◽  
Orthogonal Experimental Design ◽  
Grey System ◽  
Power Station ◽  
Hydro Power ◽  
Underground Cavern

Engineering rock mass is a highly complex grey system, it is impossible to get all the parameters of rock mass by theoretical methods or field measurement approach. Underground engineering feedback analysis method is a reliable way to improve the design, optimization and construction. Based on the field data of underground cavern of a large-scale hydro-power station, the three-dimensional finite element model is established, and orthogonal experimental design and multi-objective optimization method are used for the rapid back analysis. This method could be used for obtaining the rock parameters by inversion calculating in the underground cavern construction of a large-scale hydro-power station. Meanwhile, the inversion parameters could also be applied in the excavation simulation for the next phase and the rock deformation and stability is predicted afterwards. The design and construction sectors are supposed to get its feedback in time, which effectively guarantees the stability of the surrounding rocks.

scholarly journals Evaluating shear mobilization in rockfill columns used for riverbank stabilization

2009 ◽  
Vol 46 (8) ◽  
pp. 976-986 ◽  
Author(s):  
Marolo C. Alfaro ◽  
James A. Blatz ◽  
Wisam F. Abdulrazaq ◽  
Chang-Seok Kim
Keyword(s):  
Large Scale ◽  
Experimental Testing ◽  
Test Results ◽  
Lake Agassiz ◽  
Shearing Resistance ◽  
Glacial Lake Agassiz ◽  
The Stability ◽  
Rockfill Columns ◽  
The City

The major rivers within the City of Winnipeg are founded in glacial Lake Agassiz clay and silt sediments that have low shear strength. As such, riverbank instabilities are a common issue along many stretches of the rivers. The use of rockfill columns has become an increasingly utilized approach for stabilizing failing banks. Recent cases in Winnipeg have shown that movements can occur following installation of rockfill columns. Uncertainty regarding the magnitude of these movements that is required to mobilize shearing resistance in the rockfill columns has resulted in situations where the stability of riverbanks following remediation has been questioned. This has provided a need to improve our understanding about how much movement a stabilized slope must undergo before sufficient shear resistance of the rockfill column will be mobilized. The results of experimental testing conducted to assess the shear mobilization of rockfill column materials using a large-scale direct shear test apparatus are presented in this paper. The testing methodology is described along with the test results. The results show that the development of material specifications, construction, and placement methods and appropriate methods of analysis requires understanding of the stress–strain properties of the in situ soil and the rockfill material.

Study on the Stability and Deformation of the Roadway Subjected to High In-Situ Stresses

2017 ◽  
Vol 35 (4) ◽  
pp. 1615-1628 ◽  
Author(s):  
Chunhuang Du ◽  
Ping Cao ◽  
Yu Chen ◽  
Jie Liu ◽  
Yanlin Zhao ◽  
...  
Keyword(s):  
In Situ Stresses ◽  
The Stability

scholarly journals In-situ rock tests for fault gouge zone：A case in Fengman hydropower station, China

2021 ◽  
Vol 293 ◽  
pp. 03008
Author(s):  
Xinchuan Xu ◽  
Zhaoyue Yu ◽  
Fangfang Xue ◽  
Xiaogang Long ◽  
Xinyu Mao ◽  
...  
Keyword(s):  
Large Scale ◽  
Scientific Basis ◽  
Test Point ◽  
Actual Condition ◽  
Hydropower Station ◽  
Bearing Plate ◽  
Dam Site ◽  
Fault Gouges ◽  
The Stability

The existence of faults in the dam site area threatens the stability and safety of large-scale hydropower projects in China. The fault argillaceous zone is the worst kind of fault fracture zone, and the determination of its deformation and strength parameters is the key point of rock engineering investigation. In this study, the in-situ bearing plate test and direct shear test were carried out on the gouge zone of F67 fault in the dam site of Fengman Hydropower Station. The test results show that the deformation and shear law of each test point is good, which is basically consistent with the actual condition of the measured rock mass. However, due to the limited number of measurements, the results are limited in terms of macroscopic representation. The experimental results provide scientific basis for subsequent engineering design and further enhance the understanding of mechanical properties of fault gouges.

scholarly journals A chemo-enzymatic oxidation cascade to activate C–H bonds with in situ generated H2O2

2019 ◽  
Vol 10 (1) ◽  
Author(s):  
Simon J. Freakley ◽  
Svenja Kochius ◽  
Jacqueline van Marwijk ◽  
Caryn Fenner ◽  
Richard J. Lewis ◽  
...  
Keyword(s):  
Palladium Nanoparticles ◽  
Large Scale ◽  
Reaction Vessel ◽  
Enzymatic Oxidation ◽  
Catalytic Systems ◽  
In Situ Generation ◽  
Temperature And Pressure ◽  
The Stability ◽  
By Products

Abstract Continuous low-level supply or in situ generation of hydrogen peroxide (H2O2) is essential for the stability of unspecific peroxygenases, which are deemed ideal biocatalysts for the selective activation of C–H bonds. To envisage potential large scale applications of combined catalytic systems the reactions need to be simple, efficient and produce minimal by-products. We show that gold-palladium nanoparticles supported on TiO2 or carbon have sufficient activity at ambient temperature and pressure to generate H2O2 from H2 and O2 and supply the oxidant to the engineered unspecific heme-thiolate peroxygenase PaDa-I. This tandem catalyst combination facilitates efficient oxidation of a range of C-H bonds to hydroxylated products in one reaction vessel with only water as a by-product under conditions that could be easily scaled.

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