裂隙岩体地下工程冒落空间预测模型

FORECASTING MODEL OF CAVING SPACE FOR UNDERGROUND ENGINEERING IN JOINTED ROCKMASSES

根据地下工程冒落体形成的基本条件,讨论了结构面迹线和开挖面迹线的交集关系,由此构造出冒落体的概率空间,利用岩体中的结构面随机分布的特性,推出冒落空间的概率预测公式。通过工程实例分析,求出了冒落高度、冒落体积的分布概率和随结构面间距变化的冒落空间概率曲面。

According to the fundamental condition to form a falling block in underground engineering,the interset relationship of structural plane traces and excavation traces is analysed. Then a possibility space of falling blocks is found. Using the random distribution character of structural plane in rockmass,the forecasting formula of falling space possibility is obtained. By analyzing engineering cases,the possibility of falling height and falling volume,and the curved surface of falling space possibility are given,which changes with the variation of the interval distance of structural planes.