灰岩加载力学特性及渐进破坏试验研究  

Experimental Study on Mechanical Properties and Progressive Failure of Limestone under Loading Conditions

作　　者：胡桂林[1] 熊承仁[1] 谢放[1] 陶建明[2] 

机构地区：[1]中国地质大学教育部长江三峡库区地质灾害研究中心,武汉430074 [2]中国地质大学教育部工程学院,武汉430074

出　　处：《科学技术与工程》2015年第30期45-49,共5页Science Technology and Engineering

基　　金：国家自然科学基金(41272309)资助

摘　　要：以武隆鸡尾山滑坡滑体灰岩为研究对象,基于室内常规岩石力学试验,探讨了饱水与风干岩样的物理力学特性及其对高边坡稳定的影响机制,研究了灰岩渐进破坏过程中裂纹应变随加载的变化情况。试验结果表明,与风干试样相比,饱水试样的峰值强度和弹性模量较低,而泊松比较高,表现出较强的软化性;试样的裂纹起裂应力较低,而裂纹破坏应力较高。研究表明在岩质高边坡稳定性早期识别分析时,计算参数和稳定性判据的选取尤为关键,应引起足够的重视。Based on conventional laboratory rock experiment of the limestone of Ji Weishan landslide mass in Wulong County,the physical and mechanical properties of saturated and dried rock samples are discussed as well as its impact on stability of high rock slopes,and the crack strain is also studied increasing with loading during the progressive failure. The results show that,compared with the dried sample,the peak strength and elastic modulus of the saturated sample are lower,the passion＇s ratio is higher,the saturated sample show strong softening; the crack initiation stresses under two conditions are relatively low,while crack damage stresses are higher. Studies show that,during the early identification of high rock slope stability,the selection of calculation parameters and stability criterion are particularly critical and should be taken seriously enough.

关 键 词：岩石力学 灰岩 室内试验 力学特性 渐进破坏 裂纹应变 

分 类 号：TU458.3[建筑科学—岩土工程]