岩石材料真实断裂参数确定及断裂破坏预测方法

doi:10.13722/j.cnki.jrme.2017.1235

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摘要现有岩石材料断裂参数的测试方法不统一，测试结果存在尺寸效应；另一方面，即使给出材料参数，对应的岩石材料断裂破坏预测全曲线也尚未能建立。基于边界效应基本理论，研究岩石真实材料参数(断裂韧度及强度)的确定，及由确定的材料参数预测结构断裂破坏这2个拟解决而尚未圆满解决的关键科学问题。考虑岩石颗粒大小对断裂破坏的重要影响，在修正的边界效应计算模型中，引入岩石平均颗粒尺寸，进而实现由处于准脆性断裂状态下的小尺寸岩石试件，确定岩石无尺寸效应材料参数的目的。基于确定的材料参数(断裂韧度与拉伸强度)，建立可描述塑性–准脆性–脆性特性的完整的岩石材料破坏预测曲线；分别考虑和忽略虚拟裂缝扩展影响，确定出满足线弹性断裂力学条件下的理论最小岩石试件尺寸。通过几何相似试件、非几何相似试件、几何相似与非几何相似试件组合的试验验证，证明了所建立理论与模型适用于岩石材料的真实断裂参数确定以及断裂破坏预测的分析。

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	管俊峰1
	钱国双1
	白卫峰2
	姚贤华1
	付金伟1

关键词 ：岩石力学, 断裂韧度, 拉伸强度, 平均颗粒尺寸, 边界效应, 尺寸效应, 破坏预测曲线

Abstract：At present，testing methods for determining the fracture parameters of rock are not consistent，and the test results show the effect of size. Even if the material parameters are given，the corresponding full curve of the fracture prediction of rock materials has not been established. Two key issues that have not yet been satisfactorily resolved，namely，determining the true material parameters(fracture toughness and strength) of rock and predicting the fracture of rock structure，were studied in this paper according to the boundary effect theory. The average grain size of rock was introduced into the modified model of boundary effect，in which the important effect of grain size on fracture was considered. The true material parameters can be determined by using small rock specimens under quasi-brittle fracture control. The complete prediction curve of rock fracture can be constructed using the determined material constants of rocks(fracture toughness and tensile strength) in which the plastic，quasi-brittle，and brittle fractures can be fully described. If the fictitious crack formation is considered or ignored，the minimum size of the rock specimen meeting the requirement of linear elastic fracture mechanics can also be obtained. The tests results from the geometrically similar specimens，non-geometrically similar specimens，and combined specimens that are geometrically similar and non-geometrically similar，were analyzed in detail using the modified model. The rationality of the proposed method for predicting fracture and determining the true material parameters of rocks were confirmed.

Key words： rock mechanics fracture toughness tensile strength average grain size boundary effect size effect predicted curve of fracture

引用本文:

管俊峰1，钱国双1，白卫峰2，姚贤华1，付金伟1. 岩石材料真实断裂参数确定及断裂破坏预测方法[J]. 岩石力学与工程学报, 2018, 37(5): 1146-1160.
GUAN Junfeng1，QIAN Guoshuang1，BAI Weifeng2，YAO Xianhua1，FU Jinwei1. Method for predicting fracture and determining true material parameters of rock. , 2018, 37(5): 1146-1160.

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http://www.rockmech.org/CN/10.13722/j.cnki.jrme.2017.1235 或 http://www.rockmech.org/CN/Y2018/V37/I5/1146

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