循环高温淬火后花岗岩三点弯曲试验研究

张帆; 吕敦波

doi:10.11988/ckyyb.20220153

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raybet体育在线院报 ›› 2023, Vol. 40 ›› Issue (7) : 96-103. DOI: 10.11988/ckyyb.20220153

岩土工程

循环高温淬火后花岗岩三点弯曲试验研究

张帆, 吕敦波

作者信息 +

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

ZHANG Fan, LÜ Dun-bo

Author information +

文章历史 +

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。

Abstract

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.

导出引用

张帆, 吕敦波. 循环高温淬火后花岗岩三点弯曲试验研究[J]. raybet体育在线院报. 2023, 40(7): 96-103 https://doi.org/10.11988/ckyyb.20220153

ZHANG Fan, LÜ Dun-bo. Experimental Study on Three Point Bending of Granite after High Temperature Quenching and Thermal Cycling[J]. Journal of Changjiang River Scientific Research Institute. 2023, 40(7): 96-103 https://doi.org/10.11988/ckyyb.20220153

中图分类号： TU458.3

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