(東北大學土木工程系，沈陽 110006)
摘 要: 概要性地介紹了塊體理論和巖體中節(jié)理跡長的測量和計算方法，并對被節(jié)理切割的巖體中可能滑落的巖塊——關鍵塊進行了分析；把概率理論引入節(jié)理跡長分布的研究之中， 對巖體中無限長的節(jié)理假定作出有限長的修正。 采用概率分析的方法， 推導了多組節(jié)理切割巖體形成關鍵塊體概率的計算公式， 從而使原來的一些關鍵塊體轉化為穩(wěn)定塊體，減少了關鍵塊的數量。 著重對三組節(jié)理切割巖體形成的關鍵塊體進行了詳細的分析， 得到了關鍵塊滑落的概率值，并證明了體積愈小的關鍵塊愈容易滑落。
關鍵字: 塊體理論 關鍵塊 節(jié)理跡長
BLOCK THEORY
（Department of Civil Engineering, Northeastern University, Shenyang 110006, P. R. China）
Abstract:The measurement and calculation method of the joint trace length were introduced and the key blocks, which probably fall in the rockmass cut by joints, were analyzed. By using the probability theory, the joint was finite instead of infinite. The formula of probability that rockmass including several group of joints formed key blocks was deduced, which converted some original key blocks into stable blocks, so the key blocks' amount was reduced. Based on the detailed analysis for the key blocks formed by three group of joints, the probability value of the sliding of key blocks was obtained. It was proved that the smaller the volume is, the more easily the key blocks fall.
Key words: block theory key block joint trace length
