Test Embankment Dam of Fracture Grouting
Publication: Journal of Geotechnical Engineering
Volume 115, Issue 11
Abstract
A fracture-grouting test section is a 7.1-m-high homogeneous dam of compacted silty clay on a foundation of the same material. Four test holes with different depths and lengths of casing are drilled at the dam crest along the dam axis. The grouting pressure variation curves are measured while the holes were grouted, and the shape and orientation of grout vein are recorded while the test section is excavated. The fracturing pressure is found to be directly related to the stress of the dam where fracturing started. The fracturing in an uncased hole starts near the middle height of the dam and expanded laterally and vertically. If long casing restricts fracturing within the lower part of the dam, the grout vein will have uniform thickness along the depth and be able to extend into foundation soil. All the grout veins are parallel to the dam axis and vertical.
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References
1.
Chen, Y. J. (1982). “Grouting for sealing the cohesive fill of embankment dam.” Question 55, Report 46, Trans. 14th Int. Congress on Large Dams, International Commission on Large Dams, 4, 785–797.
2.
Chen, Y. J., Kong, F. L., and Zhu, J. H. (1985). “The hydraulic fracturing tests of a compacted clay.” Contributions for Commemorating the Jubilee Anniversary of ISSMFE, Chinese Nat. Soc. of Soil Mech. of Foundation Engrg., 1–6.
3.
Chen, Y. J. (1987). “Water loss from boreholes in an embankment dam.” Proc., 8th Asian Regional Conf. on Soil Mech. and Foundation Engrg., Japanese Soc. of Soil Mech. and Foundation Engrg., 1, 445–448.
4.
Chen, Y. J. (1988). Discussion of “Hydraulic fracturing in embankment dams” by J. L. Sherard. J. Geotech. Engrg. Div., ASCE, 114(6), 737–740.
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Published In
Journal of Geotechnical Engineering
Volume 115 • Issue 11 • November 1989
Pages: 1668 - 1672
Copyright
Copyright © 1989 ASCE.
History
Published online: Nov 1, 1989
Published in print: Nov 1989
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