岩石拉压蠕变试验仪研制及应用  

On the Development and Application of an Experimental Instrument for Rock Creep Behavior Subjected to Tensile and Compressive Action

作　　者：赵宝云[1,2] 刘伟 许年春[1] 李子运[1] 

机构地区：[1]重庆科技学院建筑工程学院,重庆401331 [2]后勤工程学院土木工程系岩土力学与地质环境保护重庆市重点实验室,重庆401311 [3]重庆市地勘局208水文地质工程地质队,重庆400700

出　　处：《实验力学》2016年第2期238-242,共5页Journal of Experimental Mechanics

基　　金：国家自然科学基金(41302223);重庆市基础与前沿研究计划项目(CSTC2013jcyjA90004);重庆市博士后科研项目特别资助项目(Xm2014033)

摘　　要：为了探索岩石在周期性恒定拉伸、压缩荷载作用下的蠕变行为,结合杠杆原理,设计研制了一种岩石杠杆式拉伸、压缩蠕变试验仪。该仪器具有挂重质量小、可方便切换拉、压荷载等特点。首先,通过标定好的数显式拉压荷重传感器对该试验仪拉伸、压缩荷载进行了校正,得出试验仪压缩、拉伸荷载杠杆扩力比分别为81.29倍与59.46倍,挂重质量与施加在岩样荷载呈线性关系(压缩作用下线性关系相关系数R2=0.99975,拉伸作用下R2=0.9991),荷载施加稳定。最后,采用该试验仪对红砂岩进行了单轴恒定拉、压循环荷载下的蠕变试验,探讨了受荷岩样拉压蠕变规律。上述成果丰富了岩石蠕变测试与研究内容,有助于岩石力学试验测试的发展。In order to explore the creep behavior of rock subjected to periodic constant tensile and compressive loading, a lever-type rock tensile and compression creep experimental instrument was designed and developed based on lever principle. The instrument has advantages of light hang weight, easy switching between tension and compression loading etc. First of all, a standadized digital display tension and compression load sensor was used to calibrate the tensile and compressive loads, the tensile and compressive force amplification ratios of the lever are 59.46 and 81.29, respectively; the relation between hang weight and load applied on rock sample is linear （linear correlation coefficients are R^2 =0. 99975 for compression and R^2 =0. 9991 for tension, respectively）, and the loading system runs steadily. Finally, based on uniaxial creep experiment of red sandstone samples subjected to constant tensile and compressive cyclic loading, rock creep behavior was studied by using this experimental instrument. Above results can enrich rock creep experimental method and study content, and are helpful to the development of rock mechanics experiment.

关 键 词：蠕变 岩石力学 试验仪 循环荷载 

分 类 号：TU451[建筑科学—岩土工程]