高温后花岗岩的劈裂试验及热损伤特性研究

doi:10.13722/j.cnki.jrme.2014.1631

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摘要采用电液伺服试验系统对高温后的花岗岩试样进行巴西圆盘劈裂试验，比较分析不同温度(25 ℃～ 1 000 ℃)作用后花岗岩的劈裂破坏形态、荷载–位移曲线、抗拉强度等，提出径向模量的概念，并据此定义热损伤变量，从损伤力学角度研究花岗岩在拉伸破坏条件下的热损伤特性。研究结果表明：随着温度的升高，花岗岩试样发生脆–塑性转化，其荷载–位移曲线由“下凹”向“上凸”转变，试样的抗拉强度与径向模量均呈下降趋势，并表现出较明显的阶段特征，其中径向模量在100 ℃时不减反增；热损伤变量总体上随温度升高而递增，但在100 ℃时出现“负损伤”；最后，推导适用于本文条件的热损伤演化方程与热–力耦合本构模型，模型曲线与试验曲线基本吻合。

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	方新宇1
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关键词 ：岩石力学, 高温后, 花岗岩, 巴西圆盘, 劈裂试验, 热损伤

Abstract：Electrohydraulic servo test system was adopted to conduct the Brazilian disk splitting tests of granite specimens after heated. The failure modes，load-displacement curves and tensile strengths of granite heated to different temperatures (25 ℃–1 000 ℃) were compared and analyzed. The two parameters，radial modulus and thermal damage variable，were defined in order to study the thermal damage properties of granite under the condition of tensile failure. The results show that with the increase of heating temperature，a brittle-plastic transition occurs inside the granite specimens，of which the load-displacement curves vary from concave-shape to convex-shape. The tensile strength and radial modulus both show a downward trend and obvious staged characteristics，wherein the radial modulus grows up rather than decreases at 100 ℃. Similarly，the thermal damage variable increases with the growth of temperature on the whole，but shows negative at 100 ℃. At last，the thermal damage evolution equation and temperature-mechanics constitutive model suitable for the condition herein are deduced and discussed while the model curves basically match the experimental curves.

Key words： rock mechanics post-high temperature granite Brazilian disk splitting tensile tests thermal damage

引用本文:

方新宇1，许金余1，2，刘石1，王鹏1. 高温后花岗岩的劈裂试验及热损伤特性研究[J]. 岩石力学与工程学报, 2016, 35(S1): 2687-2694.
FANG Xinyu1，XU Jinyu1，2，LIU Shi1，WANG Peng1. . , 2016, 35(S1): 2687-2694.

链接本文:

https://rockmech.whrsm.ac.cn/CN/10.13722/j.cnki.jrme.2014.1631 或 https://rockmech.whrsm.ac.cn/CN/Y2016/V35/IS1/2687

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