基于循环荷载损伤定量控制的岩石CWFS改进模型研究

doi:10.13722/j.cnki.jrme.2023.0462

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摘要黏聚力强度弱化–摩擦力强度强化(CWFS)模型形式简洁且参数物理意义明确，但模型准确度和适用性欠佳。开展花岗岩(致密结晶硬岩)和粉砂岩(多孔弱胶结岩)的三轴分级循环加卸载损伤控制试验，对传统CWFS模型进行黏聚力和内摩擦角方程、剪胀角方程、横纵应变比方程3个方面的改进。首先，优化模型应力水平定量表征点并统一塑性参数以准确获取模型参数定量结果；而后，适应岩石试验黏聚力弱化和摩擦力先强化后弱化的特征结果，引入强化和弱化控制系数，构建非线性黏聚力和内摩擦角方程；最后，对应屈服阶段的非线性剪胀和屈服前弹性阶段的显著非线性横向变形，分别建立非线性剪胀角方程和横纵应变比方程。适用性验证结果表明，改进后的CWFS模型可准确适用于试验花岗岩和粉砂岩，亦可准确适用于北山花岗岩和砂岩，能够合理地描述岩石全应力–应变过程中的应变软化、剪胀扩容和弹塑性应变演化规律，较传统CWFS模型准确度和适用性均有显著提高。

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	苗胜军1
	2
	刘泽京1
	2
	梁明纯1
	2
	赵子岐1
	2

关键词 ：岩石力学, CWFS模型, 黏聚力强度, 摩擦力强度, 非线性剪胀, 横纵应变比

Abstract：The simplicity form and clear physical meaning of parameters are possessed by the cohesion weakening and friction strengthening(CWFS) model. However，the accuracy and applicability of the traditional CWFS model are not satisfactory. In this study，triaxial graded cyclic loading and unloading damage control tests of granite(tight crystalline hard rock) and siltstone(porous weak cemented rock) were performed. The traditional CWFS model was improved in three aspects：cohesion and friction angle equation，dilation angle equation，lateral to axial strain ratio equation. Firstly，the quantitative characterization points of the model stress level were optimized and the plastic parameters were unified to accurately obtain the quantitative results of the model parameters. Secondly，in response to the characteristic results of weakening cohesion and strengthening and then weakening friction，the strengthening and weakening control coefficients were introduced to construct nonlinear cohesion and friction angle equations. Finally，nonlinear dilation angle equations were established to account for the nonlinear dilation during the yield stage，and nonlinear lateral to axial strain ratio equations were developed to capture the significant nonlinear lateral deformation during the elastic stage before yield. Applicability verification shows that the improved CWFS model can be accurately applied to granite and siltstone，as well as Beishan granite and sandstone. The improved CWFS model reasonably describes the evolution phenomena of strain softening，dilatancy，elastic strain and plastic strain during the complete stress-strain process of rocks. Importantly，the improved CWFS model has significantly improved accuracy and applicability compared to traditional CWFS models.

Key words： rock mechanics CWFS model cohesion strength friction strength nonlinear dilatation lateral to axial strain ratio

引用本文:

苗胜军1，2，刘泽京1，2，梁明纯1，2，赵子岐1，2. 基于循环荷载损伤定量控制的岩石CWFS改进模型研究[J]. 岩石力学与工程学报, 2024, 43(4): 781-796.
MIAO Shengjun1，2，LIU Zejing1，2，LIANG Mingchun1，2，ZHAO Ziqi1，2. Rock improved CWFS model based on cyclic loading quantitative damage control experiment. , 2024, 43(4): 781-796.

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http://rockmech.whrsm.ac.cn/CN/10.13722/j.cnki.jrme.2023.0462 或 http://rockmech.whrsm.ac.cn/CN/Y2024/V43/I4/781

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