摘要
实际干热岩开采时储层花岗岩会经历高温-水冷冲击耦合过程。将花岗岩加热并分别进行室温冷却及水冷处理,并进行超声波测试、单轴抗压、X射线衍射(X-ray diffraction,XRD)、电镜扫描等试验来探究高温及冷却方式对花岗岩损伤特征的影响。发现高温导致花岗岩体积增大、质量降低、纵波波速降低、弹性模量降低、抗压强度减弱等,500~700℃下花岗岩的物理力学性质劣化迅速;微观上高温导致微裂缝的生成,水冷处理促进微裂缝的开裂和传播;宏观上水冷花岗岩的物理力学性能始终较低且塑性及延展性特征明显较高。
Usually,when dry hot rock is exploited,reservoir granite often experiences the coupling process of high temperature-water cooling shock.The granite was heated and cooled at room temperature and water cooled respectively.Ultrasonic test,uniaxial compression test,X-ray diffraction(XRD)and scanning electron microscope were carried out to explore the influence of high temperature and cooling mode on the damage characteristics of granite.The results show that high temperature results in the increase of granite volume,decrease of mass,decrease of p-wave velocity,decrease of elastic modulus and decrease of compressive strength,and the physical and mechanical properties of granite deteriorate rapidly at 500℃to 700℃.Microcosmic high temperature leads to the formation of microcracks,and water cooling treatment promotes the cracking and propagation of microcracks.Macroscopically,the physical and mechanical properties of water-cooled granite are always low and the ductility and ductility are obviously high.
作者
余莉
祝瀚政
李国伟
张钰
韩子豪
彭海旺
YU Li;ZHU Han-zheng;LI Guo-wei;ZHANG Yu;HAN Zi-hao;PENG Hai-wang(College of Civil Engineering and Architecture, Hebei University, Baoding 071002, China)
出处
《科学技术与工程》
北大核心
2022年第14期5784-5791,共8页
Science Technology and Engineering
基金
河北省高等学校科学技术研究项目(BJ2018046)。
关键词
高温
冷却方式
损伤特征
力学响应
high temperature
cooling mode
damage characteristics
mechanical response
作者简介
第一作者:余莉(1985—),女,汉族,四川绵阳人,博士,副教授,研究方向:岩土工程,E-mail:yulihejibin@126.com;通信作者:祝瀚政(1997—),男,汉族,河北保定人,硕士研究生,研究方向:岩土工程,E-mail:1315316408@qq.com。
