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在许多场合下,节理化程度是岩体稳定性最重要的因素。体积节理计算(J_v)是节理化程度一种简单的量度。它考虑全部出现的节理和裂隙,并很容易由标准的节理描述计算出来。挪威工程地质师使用(J_v)已有数年,它在岩体描述和分类方面已成为有用的手段。本文叙述(J_v)的计算步骤,并指出节理间距是如何包含在量度之中的。本文示出(J_v)的分类及其对RQD系统及对Q系统的关系;也示出怎样由(J_v)方便地评价内部岩块的尺寸。
In many cases, the degree of jointing is the most important factor in rock stability. The volumetric joint calculation (J_v) is a simple measure of the degree of jointing. It considers all joints and cracks that appear, and is easily calculated from the standard joint description. Used by Norwegian engineering geologists (J_v) for several years, it has become a useful tool for describing and classifying rock masses. This paper describes the calculation steps of (J_v) and points out how the joint pitch is included in the measurement. This article shows the classification of (J_v) and its relationship to the RQD system and to the Q system; it also shows how the dimensions of the internal rock block are conveniently evaluated by (J_v).