| Jinping 1st hydropower station arch dam is of similar construction in the world highest dam. As the steep bank slope of Jinping dam site, excavation of large, complex body excavation, foundation rock unloading and relaxation is very conspicuous, the selection of mechanical parameters of rock has become the key problems. In this paper, based on review of dam foundation rock mass of large-situ test data, geophysical test data to collate statistical analysis, the foundation rock of the rock mechanical parameters of test values. On this basis, beginning on the use of velocity and the correlation between rock mechanical parameters, RQD and rock mass quality index model of the correlation between changes on the foundation rock by rock-and by parts of the rock mass mechanical parameters to predict Reliability methods and used the strength parameters of foundation rock of the experimental data were then analyzed. Also studied the relaxation characteristics of foundation rock blasting and the aging characteristics of relaxation, unloading and relaxation on the dam foundation rock mass mechanical parameters selected after a preliminary study. Specific contents and results are as follows:(1) The basic engineering geological conditions in the basis of the analysis, combined with foundation excavation revealed after the geological conditions, a more comprehensive review of the dam foundation rock mass characteristics, show characteristics of rock mass after excavation with a stage of feasibility study stage of the basic features of rock mass quality has been.(2)Detailing phase of E050 by in situ test data collation and review, validate parameters of the proposed preliminary E050 reasonable value and reliability. Recommended value for the pre-preliminary conclusions are reasonable and reliable.(3) Layout design stage through to the E050 with the wear obtained the data on acoustic Vcp feasibility study stage and the establishment of the E050 ~ Vcp relations review, that early establishment of the E050 ~ Vcp relationship is reasonable and reliable.(4) Through the various stages of feasibility study and detailing Adit, foundation and body of the single-hole acoustic resistance and acoustic data on the wear-related research, verify pre-Vp ~ Vcp relations, and on this basis and the establishment of E0 ~ Vp relations, the forecast for the rock mechanics parameters to do further analysis. (5) Feasibility study stage by Adit received E050 with RQD data correlation study established the correlation between E050 ~ RQD. And the foundation rock obtained from the survey line, the RQD of data were analyzed to carry out mass changes the forecast model E050. At the same time as the rock mass mechanical parameters predicted a new way to provide.(6) The reliability of methods used rock strength parameters of a re-analysis of experimental data obtained excellent reliability methods and basic findings of the slope method will have, but the result is slightly lower reliability methods. Reliability Prediction mechanical parameters of rock that is reasonable and feasible.(7) Classic Hoek-Brown criterion developed on the basis of the geological strength index GSI method of physical parameters of the construction of rock by rock-level prediction for the strength parameters.(8) To the dam foundation rock of Vp of the Long View data based on preliminary analysis, obtained after the relaxation of foundation rock burst characteristics and aging characteristics of relaxation, on this basis, the whole development of foundation rock of the relaxation law analyzed the relaxation of the rock foundation rock mechanical parameters, and the relaxed state of the rock foundation rock mechanical parameters for prediction. |
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