水电边坡岩体稳定性分级系统研究

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Abstract Most slope rockmass rating originated or amended from rockmass classification designed for underground engineering，those classification systems don?t take into account the influence of failure-mechanism differences on slopes. To make up this theoretical defects of slope rockmass classification，this paper presents a rockmass classification based on slope failure mechanism. In this study，hydropower slopes were used as samples for the establishment of this classification system；eight impact factors for potential planar or already plane failed slopes were analyzed and collected，these factors are the slope geometry，the intact rock strength，the rockmass integrity features，the discontinuities characteristics，the geometrical relationship between discontinuities and slope，the engineering environment，the climate conditions and the failure history；then the multiple linear regression method was used to explore the relationship between the slope rockmass stability and the impact factors，the weights of each factor was obtained hereafter；and finally，the slope rockmass stability classification (SRSC) system was established by eliminating the factors whose weights were almost zero. Compared with the existing slope rockmass rating(SMR，CSMR) system，SRSC system?s evaluation results are closer to the experience scores which based on field condition，standard error is smaller，and evaluation accuracy rate is larger；moreover，twelve hydropower slopes were used to verify SRSC?s accuracy and applicability，correctness rate of evaluation is 100%，which indicates excellent evaluation results of SRSC system. Thus SRSC system based on slope failure mechanism is a superior rockmass classification system for slopes.

Key words： hydropower project slope rockmass stability classification planar failure impact factors slope rockmass rating(SMR) Chinese slope rockmass rating(CSMR)

Received: 02 July 2010

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https://rockmech.whrsm.ac.cn/EN/Y2011/V30/IS2/3481

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