新型岩石直接拉伸试验对中装置研制及应用  

Development and application of new centering device for rock direct tensile test

作　　者：张强勇[1] 范清涵 王鹏飞 周子晗 ZHANG Qiangyong;FAN Qinghan;WANG Pengfei;ZHOU Zihan(Geotechnical and Structural Engineering Research Center,Shandong University,Jinan 250014,China;Hohai-Lille College,Hohai University,Nanjing 211100,China)

机构地区：[1]山东大学岩土与结构工程研究中心,山东济南250014 [2]河海大学河海里尔学院,江苏南京211100

出　　处：《实验技术与管理》2023年第8期149-154,共6页Experimental Technology and Management

基　　金：国家自然科学基金项目(42172292);山东能源集团揭榜挂帅项目(SNKJ2022A01-R26)。

摘　　要：岩石直接拉伸试验中普遍存在受拉偏心的问题,使得试验的成功率较低。该文研制了一套岩石直接拉伸试验对中装置,包括黏接对中装置和动态拉伸对中装置两部分,可直接匹配万能试验机和标准岩石试件使用。为验证该装置的可靠性,对8种不同类型的岩样开展了直接拉伸试验,准确获得了岩石抗拉强度、拉伸弹性模量等拉伸力学参数,以及岩石拉伸全应力-应变曲线,证明装置能够有效解决直接拉伸试验中岩石试件偏心受力的问题,也为工程提供了重要的直接拉伸力学参数。Eccentric tension is a common problem in rock direct tensile test,which makes the success rate of the test low.In this paper,a set of rock direct tensile test centering device is developed,including bonding centering device and dynamic tensile centering device,which can be directly matched with universal testing machines and standard rock specimens.In order to verify the reliability of the device,direct tensile tests are carried out on 8 different types of rock specimens.The tensile mechanical parameters such as tensile strength and tensile elastic modulus of rock,as well as the full stress-strain curve of rock in tension are accurately obtained through the tests,which proves that the device can effectively solve the problem of eccentric stress on rock specimens in direct tensile test,and also provided important direct tensile mechanical parameters for engineering.

关 键 词：岩石直接拉伸试验 拉伸对中装置 抗拉强度 极限拉应变 拉伸全应力-应变曲线 

分 类 号：TU45[建筑科学—岩土工程]