节理平均迹长与统计窗选位关联性分析

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Abstract Now the assumed condition of common sampling window methods is that joint centers obey the uniform distribution，it means that the location of sampling windows has no effect on mean trace length of joints. Yet in fact，as products of the lengthy geological evolution，joints have been suffered from multiple geological formations and tectonic movements，shapes and scales have been changed largely；so their distributes display typical geological rhythm characteristics. If sampling windows are arranged at random，they will generate different mean trace length results. In order to find the relationship between mean trace length of joints and location of sampling window，taking the underground main powerhouse of Dagangshan hydropower station for example，firstly，the geological evolution rule of joints at its downstream wall was analyzed，and that diabase dikes and their influence areas were identified as the dominant joint sets，then choosing diabase dike ?81 and its influence areas to research their geological rhythm characteristics in detail；based on their characteristics，these proposals about the locations，sizes and estimation methods of sampling windows for deciding mean trace length of joints are put forward. Finally，five kinds of methods are used to calculate and compare the estimation results of mean trace length in different sections. The results indicate that the mean trace length of joints has a strong relationship with the location of sampling window；different distribution characters of joints and different locations of sampling windows will lead to different calculated values. So when using sampling window methods，it is needed to adequately consider the development rules of objective joints，and assign the location of sampling window accurately in order to contain all kinds of joints as far as possible；the sampling window should include intersecting，transecting and contained traces synchronously；and the estimation method should be chosen adequately.

Key words： rock mechanics location of sampling window mean trace length dominant joint sets geological rhythm characteristics relationship

Received: 18 November 2010

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https://rockmech.whrsm.ac.cn/EN/Y2011/V30/I3/596

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