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Evaluation of excavation-induced relaxation and its application to an arch dam foundation

โœ Scribed by S. H. Chen; G. J. Wang; H. Zhou; W. M. Wang; L. C. Zou

Publisher
John Wiley and Sons
Year
2011
Tongue
English
Weight
838 KB
Volume
36
Category
Article
ISSN
0363-9061

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โœฆ Synopsis

SUMMARY

Based on the damage mechanism of rock during excavation, the maximum tensile strain criterion for pinpointing relaxation region or excavationโ€disturbed (damage) zone (EDZ) is introduced. To simulate the deformation and stress redistribution caused by the deterioration of the deformation and strength parameters in the EDZ, the โ€˜restraintโ€relaxationโ€™ finite element algorithm is formulated using the deformation and strength parameters of preโ€and postโ€relaxation. The Xiaowan arch dam project (292โ€‰m high) is studied by the proposed method, in which the permissible tensile strain and fluidity parameter are evaluated using back analysis. The computation results have good agreement with the field monitoring. An important inference from the study is the necessity of considering the relaxation effects on the dam/foundation system during the construction and operation period. Copyright ยฉ 2011 John Wiley & Sons, Ltd.

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