中文摘要：

结构面的大小规模不仅影响岩体的力学性质,而且影响工程岩体的力学作用及其稳定性.假定岩体结构面的形态为圆盘状,利用建立的结构面迹长与其直径间的概率关系综合模型,结合结构面迹长的估计值可以反算结构面直径,从而用来直接反映结构面的规模大小.以龙滩水电站蠕变体B区为例,在该区某监测平硐结构面测量的基础上,运用Dips软件对所测结构面进行优势分组,然后采用广义H-H法对每组优势结构面迹长进行估计.基于3种结构面迹长与其直径间的基本概率关系模型,分析取样面的分布特征,考虑2个主要影响因素,推导了适用于该区域结构面迹长与其直径间的综合模型.计算得到3组优势结构面的直径分别为3.80,3.29,1.00,表明结构面的规模较小,该区域岩体较为稳定.

英文摘要：

The scale of discontinuities not only affects the mechanical properties, but also affects the engineering function and stability of rock mass. Assumed discontinuities form of rock mass is thin disc, the diameter can be obtained according to the probabilistic model between trace length and diameter and the value of trace length d rock mass discontm＇ uities. Regarding creep rock mass zone B at Longtan hydropower station as a case and based on the n~umrement of discontinuities in monitoring ff tunnel in this zone, the software Dips is used to group the discon ＇tmuifies and the methods of generalized H- H is applied to estin~es the size d trace length d each group. There are three pwbability mot~ bet~：en the trace length and the diaracter of discontinuities and according to the distribution characters of the sampling plane, a comprehensive model is ~Rhli~hed that is applicable to the project. ~ di~ d each group is calculated and is 3.80,3.29 and 1 .~ respectively,it shows that the scale discontinuities is smaller and the rock mass in this zone is stable.