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A study on crack damage stress and the damage constitutive model of frozen sandstone
Bulletin of Engineering Geology and the Environment ( IF 3.7 ) Pub Date : 2021-07-09 , DOI: 10.1007/s10064-021-02361-9
Feng Ming 1 , Shujuan Zhang 1 , Fujun Niu 1 , Zhiwei Zhou 1
Affiliation  

The artificial ground freezing (AGF) method has been widely used in underground engineering construction. As the main load-bearing elements of the AGF method, the strength of frozen walls is expected to play a crucial role in engineering stability. To improve the accuracy of quantitative evaluations of engineering stability, it is necessary to grasp the strength characteristics of frozen rock during service. To achieve this, the red sandstone taken from a frozen shaft project was tested via triaxial compression at different temperatures (−5°C,−10°C,−15°C,−20°C,−25°C, and −30°C). After that, a damage constitutive model with a Weibull distribution was derived to characterize the damage development of the frozen sandstone. Based on the validated model, the variation of damage degree was analyzed. The results show that the crack initiation stress, crack dilation stress, and peak strength all increase with decreasing temperature. The crack damage threshold increases as the frozen sandstone strength increases. The presented damage constitutive model can reflect the damage evolution of frozen sandstone. When the stress exceeds the crack initiation stress, the damage degree begins to increase, and it increases quickly when the stress approaches the peak strength. The model parameters can reflect the influence of negative temperatures on the strength of frozen sandstone. The crack damage threshold could be treated as an essential intrinsic property for predicting the failure process of frozen sandstones. The results can provide an important reference for the design and construction of frozen ground engineering.



中文翻译:

冻砂岩裂纹损伤应力及损伤本构模型研究

人工地面冻结(AGF)方法在地下工程建设中得到了广泛的应用。作为 AGF 方法的主要承重元素,冻结墙的强度预计在工程稳定性中起着至关重要的作用。为提高工程稳定性定量评价的准确性,需要掌握冻结岩在服役过程中的强度特征。为实现这一目标,从冻结竖井项目中提取的红砂岩在不同温度(-5°C、-10°C、-15°C、-20°C、-25°C 和 -30 ℃)。之后,推导出具有威布尔分布的损伤本构模型来表征冻砂岩的损伤发展。基于验证的模型,分析了损伤程度的变化。结果表明,裂纹萌生应力、裂纹扩展应力和峰值强度都随着温度的降低而增加。裂纹损伤阈值随着冻结砂岩强度的增加而增加。提出的损伤本构模型可以反映冻砂岩的损伤演化过程。当应力超过裂纹萌生应力时,破坏程度开始增加,当应力接近峰值强度时破坏程度迅速增加。模型参数可以反映负温度对冻结砂岩强度的影响。裂纹损伤阈值可以作为预测冻结砂岩破坏过程的一个重要的内在属性。研究结果可为冻土工程的设计和施工提供重要参考。裂纹损伤阈值随着冻结砂岩强度的增加而增加。提出的损伤本构模型可以反映冻砂岩的损伤演化过程。当应力超过裂纹萌生应力时,破坏程度开始增加,当应力接近峰值强度时破坏程度迅速增加。模型参数可以反映负温度对冻结砂岩强度的影响。裂纹损伤阈值可以作为预测冻结砂岩破坏过程的一个重要的内在属性。研究结果可为冻土工程的设计和施工提供重要参考。裂纹损伤阈值随着冻结砂岩强度的增加而增加。提出的损伤本构模型可以反映冻砂岩的损伤演化过程。当应力超过裂纹萌生应力时,破坏程度开始增加,当应力接近峰值强度时破坏程度迅速增加。模型参数可以反映负温度对冻结砂岩强度的影响。裂纹损伤阈值可以作为预测冻结砂岩破坏过程的一个重要的内在属性。研究结果可为冻土工程的设计和施工提供重要参考。当应力超过裂纹萌生应力时,破坏程度开始增加,当应力接近峰值强度时破坏程度迅速增加。模型参数可以反映负温度对冻结砂岩强度的影响。裂纹损伤阈值可以作为预测冻结砂岩破坏过程的一个重要的内在属性。研究结果可为冻土工程的设计和施工提供重要参考。当应力超过裂纹萌生应力时,破坏程度开始增加,当应力接近峰值强度时破坏程度迅速增加。模型参数可以反映负温度对冻结砂岩强度的影响。裂纹损伤阈值可以作为预测冻结砂岩破坏过程的一个重要的内在属性。研究结果可为冻土工程的设计和施工提供重要参考。裂纹损伤阈值可以作为预测冻结砂岩破坏过程的一个重要的内在属性。研究结果可为冻土工程的设计和施工提供重要参考。裂纹损伤阈值可以作为预测冻结砂岩破坏过程的一个重要的内在属性。研究结果可为冻土工程的设计和施工提供重要参考。

更新日期:2021-07-12
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