成型压力对铁-晶-砂混合相似材料性质的影响  

Effects on iron-barite-sand mixed similar material properties induced by molding pressure

作　　者：张绪涛[1,2] 张强勇[1] 曹冠华[1] 许孝滨[1] 

机构地区：[1]山东大学岩土与结构工程研究中心,山东济南250061 [2]聊城大学建筑工程学院,山东聊城252059

出　　处：《山东大学学报（工学版）》2013年第2期89-95,共7页Journal of Shandong University（Engineering Science）

基　　金：国家自然科学基金项目资助(41172268);国家自然科学基金项目资助(51279093);国家重点基础研究发展计划(973)资助项目(2009CB724607)

摘　　要：地质力学模型试验中常用的相似材料多以散粒体为主,相似材料的成型压力对其性质会有显著的影响,而目前的研究中均忽略了这一重要影响因素,基于此对成型压力对铁-晶-砂混合相似材料性质的影响进行了研究。在严格控制试件成型压力的条件下,定量测试了材料的物理力学参数。结果表明:成型压力对相似材料的性质有非常明显的影响,随着成型压力的增大,相似材料的密度、抗压强度、弹性模量、抗拉强度和粘聚力提高明显,而内摩擦角变化不大。相似材料能否满足相似比是地质力学模型试验的前提和关键,开展高地应力条件下的地质力学模型试验时,相似材料在试制阶段试件的成型压力应与模型试验阶段的试验压力保持一致,否则会导致模型试验失真甚至失败。利用铁-晶-砂混合相似材料,在严格控制压力的基础上取得了良好的试验效果,已多次模拟出深部巷道的分区破裂现象。Similar materials used in geo-mechanical model test is commonly granular mixtures, and the influence on iron-barite-sand mixed similar material properties induced by molding pressure is remarkable, which was ignored by most researchers. The study of iron-barite-sand mixed similar materials properties was carried out. Under a certain pres- sure, the physical and mechanical parameters of the similar materials were measured quantitatively. The research results showed that the molding pressure could heavily affect the properties of similar materials. As the molding pressure in- creasing, the density, the compressive strength, the elastic modulus, the tensile strength and the cohesion force of simi- lar material improved significantly, while the internal friction angle had no obvious change. The suitable similar materi- als was the key problem of geo-mechanical model test. Under high in-situ stress condition, the molding pressure of specimens should be equal to the compacting pressure of geo-mechanical model. Otherwise, the model test would be distorted or even be lost. Using the iron-barite-sand mixed similar materials, the zonal disintegration of deep tunnel reappeared repeatedly by stricdy controlling the pressure.

关 键 词：地质力学模型试验 相似材料 成型压力 深部巷道 分区破裂 

分 类 号：TU452[建筑科学—岩土工程]