循环高温淬火后花岗岩三点弯曲试验研究  

Experimental Study on Three Point Bending of Granite after High Temperature Quenching and Thermal Cycling

作　　者：张帆 吕敦波 ZHANG Fan;LU Dun-bo(School of Civil Engineering,Architecture and Environment,Hubei University of Technology,Wuhan 430068,China)

机构地区：[1]湖北工业大学土木建筑与环境学院,武汉430068

出　　处：《长江科学院院报》2023年第7期96-103,共8页Journal of Changjiang River Scientific Research Institute

基　　金：国家自然科学基金面上项目(51979100);山东省鲁南地质工程勘察院开放基金项目(LNY2020-Z08)。

摘　　要：高温作用对地下热储层岩石的力学性质具有重要的影响。为研究高温对花岗岩Ⅰ型断裂韧度的影响,对400℃循环高温淬火(1、3、5、7次)后的半圆弯曲花岗岩试样进行三点弯曲试验。分析了循环高温淬火后花岗岩试样的破坏特征、荷载-位移曲线和断裂韧度随淬火次数的变化规律。结果表明,随着热循环次数的增加,花岗岩的质量和密度逐渐减小,峰值荷载不断降低,断裂面粗糙度逐渐增加,断裂韧度明显下降。研究结果可为地热能开发以及地下岩体工程的安全性和稳定性提供理论依据。High temperatures have a significant impact on the mechanical properties of rocks in geothermal reservoirs.To investigate the influence of high temperature on the fracture toughness of Type I granite,three-point bending tests were conducted on semi-circular bending(SCB)samples of granite subjected to cyclic high-temperature quenching at 400℃for different numbers of cycles(1,3,5,and 7 cycles).The failure characteristics,load-displacement curves,and fracture toughness of the granite specimens after cyclic high-temperature quenching were also analyzed.Results demonstrate that as the number of thermal cycles increases,the mass and density of granite gradually decrease,the peak load continuously declines,the roughness of the fracture surface progressively intensifies,and the fracture toughness noticeably reduces.These findings provide a theoretical basis for the development of geothermal energy and the safety of underground engineering structures.

关 键 词：花岗岩 高温淬火 热循环 断裂韧度 三点弯曲试验 

分 类 号：TU458.3[建筑科学—岩土工程]