|本期目录/Table of Contents|

[1]包 含,郭文明,张国彪,等.基于强度参数脆性指数的岩石Ⅰ型断裂韧度评价[J].建筑科学与工程学报,2018,35(04):97-104.
　BAO Han,GUO Wen-ming,ZHANG Guo-biao,et al.Evaluation of Mode Ⅰ Fracture Toughness of Rock Based on Brittleness Index of Strength Parameters[J].Journal of Architecture and Civil Engineering,2018,35(04):97-104.
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《建筑科学与工程学报》[ISSN:1673-2049/CN:61-1442/TU]

卷:
35卷
期数:
2018年04期
页码:
97-104
栏目:
出版日期:
2018-07-30

文章信息/Info

Title:
Evaluation of Mode Ⅰ Fracture Toughness of Rock Based on Brittleness Index of Strength Parameters
作者:
包 含，郭文明，张国彪，晏长根
长安大学公路学院
Author(s):
BAO Han, GUO Wen-ming, ZHANG Guo-biao, YAN Chang-gen
School of Highway, Chang’an University
关键词:
型断裂韧度; 脆性指数; 强度参数; 多强度指标; 优化模型
Keywords:
mode Ⅰ fracture toughness;  brittleness index;  strength parameter;  multi strength index;  optimization model
分类号:
-
DOI:
-
文献标志码:
A
摘要:
在试验数据收集基础上，选取3种典型强度脆性指数作为考察对象，建立Ⅰ型断裂韧度与脆性指数之间的线性关系，得到基于不同脆性指数的岩石Ⅰ型断裂韧度参数化模型。通过引入交叉验证法获得准确的模型参数，并对模拟结果进行检验，评价各模型的适用性和相互之间的差异。结果表明：3种评价模型在评价和预测岩石Ⅰ型断裂韧度上均有很强的可靠性，可以借助脆性指数评价岩石的Ⅰ型断裂韧度；3种模型的评价和预测精度存在一定差异，总体来看，基于莫尔圆脆性指数的评价模型优于压拉强度脆性指数评价模型和抗压强度脆性指数评价模型，从而证明Ⅰ型断裂韧度是岩石综合力学性质的体现，利用多强度指标建立评价模型将会获得更准确、合理的Ⅰ型断裂韧度值；由于抗压强度获取便捷，利用其建立的评价模型也具有较高的评价精度，在要求快速评价时，可优先考虑选择基于抗压强度脆性指数的岩石Ⅰ型断裂韧度评价模型。
Abstract:
On the basis of experimental data collection, three typical strength brittleness indices were selected as the investigation object. The linear relationship between mode Ⅰ fracture toughness and brittleness index was established, and the mode Ⅰ fracture toughness parameterization models of rock based on different brittleness indices was obtained. The cross validation method was adopted to get the accurate model parameters, and the simulation results were tested to evaluate the applicability and differences between the models. The results show that the three evaluation models have strong reliability in evaluating and predicting the mode Ⅰ fracture toughness of rock, and can be used to evaluate the mode Ⅰ fracture toughness of rock by means of brittleness index. There are certain differences in the evaluation and prediction accuracy of the three models. On the whole, the evaluation model based on the Mohr circle brittleness index is superior to the compressiontension strength brittleness index evaluation model and the compression strength brittleness index evaluation model. It is proved that the mode Ⅰ fracture toughness is the embodiment of the comprehensive mechanical properties of rock, and a more accurate and reasonable mode Ⅰ fracture toughness value will be obtained by using the multi strength index to establish the evaluation model. Because of the convenience of the compressive strength, the evaluation model built with it also has high evaluation accuracy. In the requirement of rapid evaluation, the mode Ⅰ fracture toughness evaluation model of rock based on the compression brittleness index can be considered.

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更新日期/Last Update: 2018-07-18