Mechanical properties and fracture surface roughness of thermal damaged granite under dynamic splitting
Yijin Qian, Peng Jia, Songze Mao, Jialiang Lu
花岗岩是常用于高放射核废料深埋处理的天然贮存石，研究不同程度热损伤花岗岩在荷载作用下的稳定性对高放射废料深埋处理的长期安全具有重要意义。 本文对热处理后的花岗岩岩样进行了动态巴西劈裂试验，研究结果可用来定量评估动态参数。
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Yijin Qian, Peng Jia, Songze Mao, Jialiang Lu. Mechanical properties and fracture surface roughness of thermally damaged granite under dynamic splitting. Deep Underground Science and Engineering. 2024; 3(1): 103-116. doi:10.1002/dug2.12065
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本文简介：
为探究热损伤花岗岩在动态劈裂条件下的力学性能和断面粗糙度特征，对25, 200, 400, 600°C 热处理后的花岗岩岩样进行了动态巴西劈裂试验。结果表明，热损伤花岗岩的动态峰值劈裂强度随着应变率的增加而增加，表现出明显的应变率敏感性。热损伤温度升高，花岗岩中热裂纹由晶间裂纹发育至晶内裂纹，进一步发育成穿晶裂纹网。热损伤降低了动态峰值劈裂强度和最大吸收能，同时增加了峰值径向应变。热损伤花岗岩在动态荷载作用下的破坏模式为II 型劈裂破坏。利用轴向断面粗糙度指数，可有效区分动态巴西劈裂断面中楔形破坏区和拉伸破坏区的分布范围。径向粗糙度指数对应变率和温度很敏感。与峰值劈裂强度和最大吸收能量呈线性正相关，与峰值径向应变呈线性负相关。根据所提出的模型，可用来定量评估动态参数。
Brief Introduction：
In order to understand the mechanical properties and the fracture surface roughness characteristics of thermal-damaged granite under dynamic splitting, dynamic Brazilian splitting tests were conducted on granite samples after being thermal-treated at 25°C, 200°C, 400°C, and 600°C. Results show that the dynamic peak splitting strength of thermal-damaged granite samples increases with the rising strain rate, exhibiting obvious strain-rate sensitivity. With the increase of temperature, the formation of thermal-induced cracks in granite develops from intergranular cracks, to intragranular cracks and to transgranular crack network. Thermal-induced damages reduce the dynamic peak splitting strength and the maximum absorbed energy while increasing the peak radial strain. The fracture mode of the thermal-damaged granite under dynamic loads is the mode II splitting failure. By using the axial roughness index , the distribution ranges of the wedge-shaped failure zones and the tensile failure zones in the fracture surfaces under dynamic Brazilian splitting can be effectively identified. The radial roughness index is sensitive to the strain rate and temperature. It takes on a linear correlation with the peak splitting strength and the maximum absorbed energy, and a linear negative correlation with peak radial strain. can be used to quantitatively estimate the dynamic parameters based on the models proposed.
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本文亮点：
得到了热损伤温度和加载速率对花岗岩动态劈裂力学性能和断裂面形态特征的影响。
系统分析了巴西劈裂岩样轴向和径向的表面粗糙度指数。
利用轴向粗糙度指数可有效区分断裂面楔形破坏区和拉伸破坏区的分布范围，利用径向粗糙度指数可定量评估动态劈裂强度、动态径向峰值应变和动态劈裂最大吸收能量。据此得到了动态劈裂参数的预测模型。
Highlights：
The effects of thermal-damage and the loading rate on dynamic splitting mechanical properties and fracture surface morphological characteristics of granite were obtained.
The surface roughness index in the axial and radial direction of the Brazilian splitting sample was analyzed.
The distribution ranges of the wedge-shaped failure zones and tensile failure zones of the fracture surfaces can be effectively identified using the axial roughness index , and the radial roughness index can be used to quantitatively estimate the dynamic splitting strength, dynamic radial peak strain, and dynamic splitting maximum absorbed energy. The prediction models of dynamic splitting parameters based on are obtained.
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通讯作者简介：
贾蓬
贾蓬，东北大学资源与土木工程学院教授，博士生导师。主要研究方向为隧道稳定性分析和深部岩石力学。曾获沈阳市政府高层次领军人才称号。主持国家自然科学基金、国家教育部和企业科研项目。在国内外期刊发表研究论文70余篇，授权发明专利10余项。现任中国岩石力学与工程学会软岩工程与深部灾害控制分会理事、中国公路学会隧道工程分会理事、中国岩石力学与工程学会地下工程分会理事。
第一作者简介：
钱一锦
钱一锦，2023年毕业于东北大学资源与土木工程学院，获土木工程硕士学位，师从贾蓬教授。目前研究方向为高温岩石的力学性能。硕士在读期间，曾在《应用基础与工程科学学报》《工程科学学报》和《中南大学学报》（自然科学版）等期刊上发表研究论文。现担任南京地铁运营有限公司工程师。
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