Method of static calculation of underground generator rooms at hydroelectric and pumped-storage stations

Mostkov, V. M.; Reznikov, R. A.

doi:10.1007/bf02304309

Cited by 4 publications

(1 citation statement)

References 2 publications

(1 reference statement)

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“…Assigning a particular value of coefficient kln in accordance with the standards, we can construct [8] the contours of the region in which the rock is in an unstable state [7]. The segments of this region adjacent to the walls and roof of the working are potentially hazardous with respect to caving in.…”

Section: (18)mentioning

confidence: 99%

Calculation of underground hydraulic structures by the finite-element method in a nonlinear formulation

Zolotov¹,

Ksenofontov²

1983

Hydrotechnical Construction

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624.131.522 ~"k~o main types of nonlinearity are important in calculations of underground structures: physical (nonlinearity of the stress--strain relation) and morphological (nonlinearity of the structure of the calculation schemes).The first nonlinearity is a consequence of the known manifestation of the physical and mechanical properties of the material: The rock mass is practically always deformed nonlinearly when driving workings owing to the development of decompression.The more specific type, the second nonlinearity, is determined by the conSiderable effect on the formation of the stress field in the finished structure of technological construction factors and especially the stepwise opening of the section of the workings and sequence of driving them. The latter necessitates examining structurally nonlinear mathematical models, i.e., those models which are transformed during calculation, reflecting the most characteristic stages of development of the structure during its construction.We will examine certain problems related to the construction and realization of geomechanicalmodels of underground structures incorporating the two indicated types of nonlinearity. Construction of Discrete Models of Structures.The development of a discrete model is the most essential stage of the calculation process when using the finite-element method (FEM). Unfortunately, in the majority of cases the given procedure is presently difficult to formalize [i]. Its realization requires from the calculator, apart from a good understanding of the statics of the structure, skill in constructing approximating meshes. Discretization of nonlinear models has a number of characteristic features.When performing this procedure the approximRting mesh is condensed at places of presumed oscillation of the sought functions in order to provide the necessary accuracy, condensing being accomplished in proportion to the increase of their gradient. In the elastic model oscillation is expressed as pronounced concentrations near sources of disturbances of the field of the function --concentrators --and therefore condensation of the approximating mesh is usually performed according to the law of geometric progression (Fig. la). In the nonlinear model the character of oscillation is somewhat more complex --the site of the extremum is generally not known beforehand and the size of the zone of disturbance of the field of the function can be estimated only approximately.Therefore, when solving nonlinear problems it is better to perform discretization of the models within the indicated zones by uniform partition into finite elements of the minimum necessary size (Fig. ib). Thus the character of the approximating meshes in the elastic and nonelastic models is substantially different. .... Translated from Gidr0tekhnicheskoe Stroitel 'stvo, No. 12, pp. 13-i9, December, 1983.

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Section: (18)mentioning

confidence: 99%

Calculation of underground hydraulic structures by the finite-element method in a nonlinear formulation

Zolotov¹,

Ksenofontov²

1983

Hydrotechnical Construction

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Comprehensive investigations of the strength and stability of workings of the powerhouse works of an underground hydroelectric station

Vasil'ev¹,

Vladimirov²,

Matrosov³

et al. 1983

Hydrotechnical Construction

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Scientific basis of the designs of the underground structures of the Rogun hydroelectric station

Ilyushin¹,

Mostkov²,

Osadchii³

1982

Hydrotechnical Construction

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The complex of underground structures of the Rogun hydroelectric station is unique not only in Soviet but also in foreign practice of underground hydrotechnical construction.The specific features of the structures are characterized by the parameters of the hydrostation and by the natural conditions of the zone of its site [i, 2].In a geological respect the zone of the site represents a single tectonic block bounded by several faults.The seismicity of the zone of the hydrostation, as of the entire region, is rated at intensity 9.Relative displacements of the walls are occurring along the sutures of the faults -the Ionakhsh and No. 35 --at a rate of 1-2 mm/yr.It is presumed that in the case of an intensity 9 earthquake the one-time displacement along the suture of fault No. 35 can reach 10-15 cm and along the Ionakhsh fault a few tens of centimeters.A characteristic feature of the rock mass of the hydrostation zone is the presence of high tectonic compressive stresses in it. The values of the vertical stresses exceed by a factor of 1.3-2 the stresses from the overlying rock stratum; the horizontal stresses exceed the vertical by a factor of 1.4-2.3.

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Method of static calculation of underground generator rooms at hydroelectric and pumped-storage stations

Cited by 4 publications

References 2 publications

Calculation of underground hydraulic structures by the finite-element method in a nonlinear formulation

Calculation of underground hydraulic structures by the finite-element method in a nonlinear formulation

Comprehensive investigations of the strength and stability of workings of the powerhouse works of an underground hydroelectric station

Scientific basis of the designs of the underground structures of the Rogun hydroelectric station

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