Seepage and Pore Pressure in the Core of a Earth-and-Rockfill Dam

2016 ◽  
Vol 50 (4) ◽  
pp. 378-384 ◽  
Author(s):  
N. A. Aniskin ◽  
L. N. Rasskazov ◽  
E. Kh. Yadgorov
Keyword(s):  
Pore Pressure ◽  
The Core ◽  
Rockfill Dam ◽  
Earth And Rockfill Dam

scholarly journals Numerical Simulation of Hydraulic Fracturing in Earth and Rockfill Dam Using Extended Finite Element Method

2018 ◽  
Vol 2018 ◽  
pp. 1-8
Author(s):  
Enyue Ji ◽  
Zhongzhi Fu ◽  
Shengshui Chen ◽  
Jungao Zhu ◽  
Zhizhou Geng
Keyword(s):  
Hydraulic Fracturing ◽  
Crack Length ◽  
Initial Crack ◽  
Extended Finite Element ◽  
Critical Crack ◽  
Propagation Length ◽  
Critical Crack Length ◽  
The Core ◽  
Rockfill Dam ◽  
Earth And Rockfill Dam

Hydraulic fracturing is one of the most important factors affecting the safety of earth and rockfill dam. In this paper, the extended finite element method (XFEM) is used to simulate the hydraulic fracturing behavior in an actual high earth and rockfill dam. The possibility of hydraulic fracturing occurrence is analyzed, and the critical crack length is obtained when hydraulic fracturing occurs. Then, the crack propagation path and length is obtained by inserting initial crack of different lengths at different elevation. The results indicate that hydraulic fracturing will not occur without the permeable weak surface (initial crack). The critical initial crack length required for hydraulic fracturing is 5.3 m of the calculation model in this paper. The propagation length decreases with the increase of elevation, and the average propagation length decreases from 9.4 m to 3.4 m. Furthermore, it is proved that the direction of crack propagation has a certain angle with the horizontal plane toward the downstream. Considering the up-narrow and down-wide type of the core wall, the possibility of hydraulic fracturing to penetrate the core is extremely high when the upper part of the core wall reaches the critical crack length.

Delineation of leakage pathways in an earth and rockfill dam using multi-tracer tests

2016 ◽  
Vol 212 ◽  
pp. 136-145 ◽  
Author(s):  
Haizhou Dong ◽  
Jiansheng Chen ◽  
Xiaoying Li
Keyword(s):  
Tracer Tests ◽  
Rockfill Dam ◽  
Earth And Rockfill Dam

Finite Element Analysis of El Infiernillo Dam

1973 ◽  
Vol 10 (2) ◽  
pp. 129-144 ◽  
Author(s):  
N. A. Skermer
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Soil Structure ◽  
Triaxial Tests ◽  
Soil Parameters ◽  
Element Analysis ◽  
The Core ◽  
Rockfill Dam ◽  
The Finite Element Analysis ◽  
Fundamental Understanding

A simple trapezoidal element is presented for use in the analysis of thin core rockfill dams with nonlinear soil parameters. Handling of nonlinear soil parameters and allowance for the intermediate principal stress in plane strain problems are discussed. The analysis of El Infiernillo rockfill dam using trapezoids in the core and transitions, and variable Young's modulus and Poisson's ratio, reveals the transfer of stress that takes place around the core. Comparisons of strain observations at El Infiernillo Dam with results from the analysis are good, except in zones of compacted rockfill. It appears that the actual stiffness of compacted granular fills may be seriously underestimated, if soil parameters are based on data obtained from triaxial tests on normally consolidated samples. A fundamental understanding of soil deformation behavior would lead to an improvement in the finite element analysis of soil structure.

scholarly journals Till Fabric and Deformational Structures in Drumlins Near Waukesha, Wisconsin, U.S.A.

1985 ◽  
Vol 31 (109) ◽  
pp. 220-228 ◽  
Author(s):  
Scott D. Stanford ◽  
David M. Mickelson
Keyword(s):  
Ground Water ◽  
Pore Pressure ◽  
Effective Stress ◽  
Ice Flow ◽  
The Core ◽  
Minimum Drag ◽  
Melt Water ◽  
Sediment Flow ◽  
Till Fabric ◽  
Sand And Gravel

AbstractDeep gravel-pit exposures reveal the distribution and structure of till and underlying sand and gravel in drumlins near Waukesha, Wisconsin. The subglacial sediment is interpreted to have moved laterally into the drumlin sites because the till thickens from the margin to the core of the drumlins, the stone orientation in the till is perpendicular and oblique to ice flow on the drumlin margins, and recumbent isoclinal folds occur in sand on the drumlin margins with axes parallel to the drumlin axes. The resulting accumulations of sediment presented obstacles to ice flow and were streamlined into the minimum-drag drumlin shape by erosion on the margins and by remolding of material in the core of the drumlins. These drumlin nuclei may have formed at spots where there was low effective stress on the bed. The subglacial sediment became mobile as a result of high pore pressure that may have developed as ground water and subglacial melt water were trapped behind a frozen bed at the ice margin. Under certain conditions, however, lateral sediment flow might also have occurred when the sediment was frozen.

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