一种改进的节理初始优势产状计算方法  

A Modified Method of Selecting Initial Centers of Joint Orientation Data

作　　者：刘健[1,2] 李珊珊[3] 陈亮[1,2] 王春萍[1,2] 李亚伟[1,2] 

机构地区：[1]核工业北京地质研究院环境工程研究所,北京100029 [2]核工业北京地质研究院中核集团高放废物地质处置评价技术重点实验室,北京100029 [3]北京航空航天大学土木工程系,北京100091

出　　处：《地下空间与工程学报》2014年第5期1053-1058,共6页Chinese Journal of Underground Space and Engineering

摘　　要：节理的优势产状是岩石工程中确定硐室布置方式和开挖方向的必需信息。动态聚类法可以完成节理优势组的自动划分,获得节理的优势产状。而如何选取初始优势产状一直是制约动态聚类法应用的重要因素。本文在最大最小距离法中引入密度项,解决了初始优势产状可能出现在低密度区的问题,提出了稳定有效的初始优势产状计算方案。分别对人造和实测节理产状数据进行试算,结果表明,改进后的最大最小距离法能够保证初始优势产状位于密度极大值点附近,且计算结果对密度搜索半径敏感度较低,具有良好的稳定性。基于选定的初始优势产状,进行优势组划分,所得划分结果的目标函数值更接近其最小值,即初始优势组划分更接近其最优分组。这表明,本文提出的改进最大最小距离法能够给出更为有效的初始优势产状。Dominant occurrences of joints in rock mass are necessary for the design of underground projects. The dynamic cluster method is found to be feasible for the determination of dominant occurrences, but the demand of initial cluster centers is one of its disadvantages. In this paper, a modified max-min distance method of selecting initial cluster centers is proposed. An item of density is added into the distance calculation. This modification moves the initial centers to the high ,density zones and it means that the calculated centers are closer to the actual dominant occurrences. Case studies show that the calculated centers are not sensitive to the radius for density calculation. The clustering results based on the modified method give lower values of objective function. It indicates that the modified method can provide more effective initial centers for the dynamic clustering.

关 键 词：优势产状 最大最小距离法 密度 动态聚类 

分 类 号：TU45[建筑科学—岩土工程]