Rock foundation of dams

To conduct optical fiber monitoring rock slide model test and optical fiber monitoring of steel concrete interface slip model test, the large triaxial shear test of geotechnical engineering was used. First, the data of sliding distance and optical loss and their dynamic range were obtained. Second, the slide distance and fiber loss relation curve and the fitting equation were worked out. Finally, the typical applications of optical fiber sensing technology in Rock Engineering (high slope engineering, rock foundation of Dam Engineering) slope stability and geological disaster monitoring were put forward.The results showed that optical fiber sensing was very sensitive, and the loss value was 30 to 50dB. The dynamic range of rock slide monitoring fiber was 3 to 3.5mm, and the dynamic range of the interface slip monitoring fiber was 1.6mm. Thus, the sensing system can detect the sliding process of the interface between the concrete and the steel plate. It provides some reference for the sliding monitoring of the composite materials.

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Influence of intermediate principal stress on correction formula of bearing capacity of rock foundation

Geotechnical Aspects of Underground Construction in Soft Ground ◽

10.1201/b17240-106 ◽

2014 ◽

pp. 567-570

Author(s):

Zhang Zhi-Min ◽

Lei Wei-Dong

Keyword(s):

Bearing Capacity ◽

Principal Stress ◽

Intermediate Principal Stress ◽

Rock Foundation ◽

Correction Formula

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Comments on calculation of the stress state in an anisotropic rock foundation

Hydrotechnical Construction ◽

10.1007/bf01427526 ◽

1983 ◽

Vol 17 (12) ◽

pp. 615-617

Author(s):

V. P. Merzlyakov

Keyword(s):

Stress State ◽

Rock Foundation ◽

Anisotropic Rock

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Hydromechanical analysis of flow behavior in concrete gravity dam foundations

Canadian Geotechnical Journal ◽

10.1139/t05-095 ◽

2006 ◽

Vol 43 (3) ◽

pp. 244-259 ◽

Cited By ~ 16

Author(s):

Evandro Gimenes ◽

Gabriel Fernández

Keyword(s):

Flow Behavior ◽

Distinct Element ◽

Jointed Rock ◽

Design Guidelines ◽

Engineering Practice ◽

Rock Foundation ◽

Gravity Dams ◽

Concrete Gravity Dams ◽

Rock Interface ◽

Dam Foundations

A key requirement in the evaluation of sliding stability of new and existing concrete gravity dams is the prediction of the distribution of pore pressure and shear strength in foundation joints and discontinuities. This paper presents a methodology for evaluating the hydromechanical behavior of concrete gravity dams founded on jointed rock. The methodology consisted of creating a database of observed dam behavior throughout typical cycles of reservoir filling and simulating this behavior with a distinct element method (DEM) numerical model. Once the model is validated, variations of key parameters including lithology, in situ stress, joint geometry, and joint characteristics can be incorporated in the analysis. A site-specific simulation of a typical reservoir cycle was carried out for Albigna Dam, Switzerland, founded on granitic rock, to assess the nature of the flow regime in the rock foundations and to evaluate the potential for sliding surfaces other than the damrock interface to develop. The factor of safety against sliding of various rock wedges of differing geometry present within the dam foundations was also evaluated using the DEM model and conventional analytical procedures. Estimates of crack propagation patterns and corresponding uplift pressures and factors of safety against sliding along the damrock interface obtained with the DEM were also compared with those from simplified procedures currently used in engineering practice. It was found that in a jointed rock, foundation uplift estimates after crack development obtained from present design guidelines can be too conservative and result in factors of safety that are too low and do not correspond to the observed behavior.Key words: hydromechanical, jointed rock, flow, dam design.

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A Study on Three-Dimensional Seepage of Dam on the Deep Pervious Fracture Rock Foundation

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.542-543.1061 ◽

2012 ◽

Vol 542-543 ◽

pp. 1061-1064

Author(s):

Hai Tao Mao ◽

Xiao Ju Wang

Keyword(s):

Finite Element ◽

Fractured Rocks ◽

Three Dimensional ◽

Rock Foundation ◽

Range Limit ◽

Fracture Rock ◽

Seepage Field ◽

Dam Foundation ◽

Flow Through ◽

Hydro Project

The theme of this paper concentrates on hydro- projects’ seepage field in rocks, including the properties of the seepage which flow through both hole qualitative like rocks and fractured rocks. Present the finite element analyzing program which can solve the problem of three dimensional seepage field in hole qualitative rock medium. Apply the program some hydro-project, computed the seepage field in the dam foundation and dam abutments. Besides, further research is done on the decision of the model range limit. And the influence of the pariah shape.

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