深部岩体地质力学模型试验相似材料脆性的调整和表征

摘要

峰后脆性是深部岩体岩爆、分层断裂等变形破坏的决定性因素之一，因此深部岩体地质力学模型试用相似材料必须要重点考虑峰后脆性。在分析无机材料脆性机理的基础上，提出通过调整骨料粒径和水泥矿物组成以及使用掺合料等技术手段来调整水泥基相似材料的脆性；以石英砂—水泥—硅灰—水体系相似材料的破坏变形特征参数为基础，采用表观弹性模量来描述相似材料变形阶段的脆性，该参数具有数据处理简单、物理意义直观等优点。%On the basis requirement of equivalent material of geo-mechanical model test for deep rock, the process of deformation and failure characteristics especially the post- peak brittleness should be studied;Based on analyzing the breakage mechanism of inorganic materials, technology method are put forward to improve the brittleness of inorganic equivalent materials such as adjusting the aggregate size and chemical composition of cement, using the different admixture. The apparent modulus is adopted to character the brittleness which has the virtues of easy numeration and intu-ition.