节理岩体中地下洞室超挖预测

本文着重于岩体中洞室超挖-不稳定楔形体的预测。首先，论述洞室超挖的基本概念、主要原因及评价方法；其次分析和比较目前现有的针对洞室超挖的计算软件及其特征；然后介绍本文作者的计算软件；最后，简单介绍一个计算实例，即从野外地质调查着手，应用数理统计理论评价构成不稳定楔形体的主要地质参数及其模型，推导岩体中洞室超挖预测的一般公式；最后评价构成不稳定楔形体主要地质参数中的主要因素及次要因素，为节理岩体洞室防止超挖及其处理提供依据。

OVERBREAK PREDICTION FOR OPENINGS IN JOINTED ROCKMASS

This article emphasizes a prediction of overbreak,the unstable wedge, for openings in jointed rock mass. Firstly, the basic concept of overbreak in opening, its main cause, and the estimating method are described. Secondly, the calculation softwares and their characteristics for opening overbreak are analyzed and compared. Then, a calculation software edited by the authors is introduced. Finely,a calculation case is given, from field investigation to statistical analysis of the parameters, a general formula for an unstable wedge is inferred; after that, the main factors affecting the unstable wedge are shown. The prediction result provides a basis for treating the overbreak.