新型土体抗拉强度测定仪的研制与应用  

DEVELOPMENT AND APPLICATION OF NEW MEASURING INSTRUMENT FOR TENSILE STRENGTH OF SOIL

作　　者：赵秀峰[1] 罗惠芬[1] 陆志锋[1] 曹景洋[1] ZHAO Xiu-feng;LUO Hui-fen;LU Zhi-feng;CAO Jing-yang(Geological Survey of Jiangsu Province(Key Laboratory of Earth Fissures Geological Disaster,MNR),Nanjing 210018,China)

机构地区：[1]江苏省地质调查研究院(自然资源部地裂缝地质灾害重点实验室),南京210018

出　　处：《地质灾害与环境保护》2020年第4期63-67,共5页Journal of Geological Hazards and Environment Preservation

基　　金：中国地质调查局地质调查项目(DD20160095-15);自然资源部地裂缝地质灾害重点实验室开放课题(NO.201301)。

摘　　要：研制了一种已获实用新型专利证书的全自动卧式土的单轴抗拉强度测定仪,该测定仪解决了因粘结过程试样与固定头不同轴而导致的应力集中和偏心受拉问题,有效减小了粘性土试样表面与支撑板面之间因吸附作用而产生的摩擦力,实现了在0.001 mm/min和2.0 mm/min之间的无级调速,数据的自动化采集、处理、分析软件更加方便试验人员研究土的拉伸特性。应用该测定仪测定了两种重塑粘性土的抗拉强度,结果表明:土的抗拉强度随拉伸速率的增大而增大,0.02 mm/min是抗拉强度随拉伸速率的增大由缓慢增大到快速增大的转折点速率,土的抗拉强度随着试样长径比的变化无显著变化。A fully-automatic horizontal soil uniaxial tensile strength measuring instrument that has obtained a utility model patent certificate is reported.The instrument solves the stress concentration and eccentricity caused by the different axes of the sample and the tensile head during the bonding process.Effectively reduces the friction force between the surface of the cohesive soil sample and the support plate due to adsorption.Achieve stepless speed regulation between 0.001 mm/min and 2.0 mm/min.Automated data collection,processing,and analysis software makes it easier for testers to study the tensile properties of soil.The instrument was used to measure the tensile strength of two disturbed clays.The results show that the tensile strength of the soil increases with the increase of the tensile rate.0.02 mm/min is the turning point rate of the tensile strength from the slow increase to the rapid increase with the increase of the tensile rate,the tensile strength of the soil with the change of the sample length-diameter ratio,there is no significant change.

关 键 词：土体 抗拉强度 拉伸速率 长径比 

分 类 号：TU43[建筑科学—岩土工程]