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Repair, Evaluation, Maintenance, and Rehabilitation Research Program. Re-Evaluation of the Sliding Stability of Concrete Structures on Rock with Emphasis on European Experience.

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Final rept. Apr 87-Apr 88,

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The sliding stability of a rock mass forming the foundation or the abutments of concrete dames, of a natural slope, or of a cut cannot be measured directly but merely conjectured. One knows, however, the nature of the mechanisms which may lead to a failure, and, conversely, remedial measures which may enhance the existing stability. Attention must be paid to sliding hazard if the presence of adversely oriented discontinuities with considerable persistence is evident, if movements take place in the rock mass, if high water pressures are measured in faults, andor if wet spots at critical areas of a slope or downstream of the dam foundation are known to occur. A changes in the flow rate of the drains can also be an indication of an unsafe condition. The most effective way and, in many instances, the only practical solution to increase stability against sliding is to prevent or to eliminate the occurrence of excessive water pressure below the foundation or in the faults. The second possibility involves reinforcements by anchoring and shear keys, and the third is removal or placement of rock masses and concrete in critical areas. The problem which arises in practice is to weigh correctly the different pieces of information relating to the assessment of the degree of stability. The aim of the authors is to draw attention to recent developments in stability analysis and in rock mass behaviour monitoring which may be helpful, in dealing with the problems encountered in practice. kr

Subject Categories:

  • Geology, Geochemistry and Mineralogy
  • Structural Engineering and Building Technology

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