大理岩循环冻融试验研究  

EXPERIMENTAL STUDY ON CYCLES OF FREEZE-THAW OF MARBLE

作　　者：吴刚[1] 何国梁[1] 张磊[1] 邱一平[1] 

机构地区：[1]上海交通大学土木工程系,上海200240

出　　处：《岩石力学与工程学报》2006年第z1期2930-2938,共9页Chinese Journal of Rock Mechanics and Engineering

基　　金：国家自然科学基金资助项目(40272115)

摘　　要：岩石作为天然的建筑材料,通常承受着自然界的风化作用,因此,研究风化对岩石物理力学特性的影响是十分必要的。温度和水分的变化是引起岩石风化的主要原因之一,尤其是循环冻融更易使岩石风化。将采自焦作的大理岩分成饱水、干燥和对比3组岩样,通过对饱水组和干燥组岩样进行60次循环冻融(每个循环24h,即冻18h,融6h)试验研究,以模拟大理岩的风化过程。在冻融前、每10次循环冻融后,量测岩样的质量、体积,利用超声检测分析仪对各岩样进行超声纵、横波探测;利用RMT–150B岩石力学试验系统对上述3组大理岩岩样进行单轴压缩试验,同时采用LOCAN320声发射仪对岩样的变形破坏过程进行监测。通过试验研究,得到冻融前后焦作大理岩的质量、体积变化及超声波速、大理岩的单轴应力–应变全过程曲线、抗压强度、抗冻系数、风化程度系数、动弹性模量以及声发射参数,从而归纳出循环冻融下大理岩的主要物理力学特性。As a kind of natural building material,rock usually is influenced by weathering.Therefore,it is necessary to research the influence of weathering on rock physical and mechanical characteristics.The changes of the temperature and water in rock are mainly reasons of weathering,especially cycles of freeze-thaw.Jiaozuo marble specimens were divided into three groups:saturated,dry and referenced groups.Through test on saturated group and dry group experienced 60 cycles of freeze-thaw(each cycle costs 24 h,namely,18 h freezing and 6 h thawing),weathering process of marble was simulated.Before freezing-thawing and after every 10 cycles of freeze-thaw,the mass and volume of specimens were measured and the ultrasonic P-wave and ultrasonic S-wave velocities of specimens were tested using ultrasonic testing instrument.The uniaxial compressive failure experiments of marble specimens were performed by RMT–150B rock mechanics test system.At the same time,the process of deformation and failure for specimens was monitored using LOCAN 320 acoustic emission test system.Through above-mentioned tests,the changes of the mass and volume,ultrasonic velocities,the complete stress-strain curves,uniaxial compressive strengths,frost resisting coefficient,weathering degree,dynamic elastic modulus and acoustic emission parameters for marble specimens were obtained before and after freeze-thaw.Consequently,main physical and mechanical characteristics of marble were summed up under cycles of freeze-thaw.

关 键 词：岩石力学 大理岩 冻融 试验 物理力学特性 

分 类 号：TU457[建筑科学—岩土工程]