不同峰前卸荷与循环侵水作用后的黄砂岩再承载蠕变特性研究

doi:10.13722/j.cnki.jrme.2023.0644

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摘要针对水利水电等涉水边坡工程开挖卸荷后长期稳定性问题，利用CDT1305–2微机控制电子压力试验系统和YAW–3000A电液式压力试验系统，开展不同峰前卸荷与循环侵水作用后黄砂岩单轴压缩与分级加载蠕变试验。以岩石无损状态为基准，运用损伤力学理论和推广后的应变等价原理，构建岩石宏细观耦合损伤变量；探究不同影响因素作用下岩石再承载蠕变性能并引入弹黏塑性理论建立一种新型非线性蠕变损伤模型。研究结果表明：(1) 岩石经，峰前卸荷作用后( 为岩石单轴抗压强度)，其内部竖向孔隙逐渐扩展，横向孔隙被压密致使轴向均质性提高，但岩石经，峰前卸荷作用后，其内部竖、横向孔隙均进一步发育、扩张使岩石整体非均质性越显著；(2) 随着峰前卸荷点逐渐增大，岩石蠕变破坏角逐渐增大且裂纹增多，蠕变变形随峰前卸荷量增加较原岩样呈先减小后增加趋势，且循环侵水作用次数越多，蠕变应力水平越大越显著；(3) 根据岩石蠕变过程中变形模量演化规律，定义全局损伤和局部时变损伤变量揭示岩石损伤演化机制，分析并构建考虑峰前卸荷、循环侵水与蠕变荷载作用的岩石宏细观耦合损伤变量；(4) 结合线性元件非定常化和损伤处理的方法建立非线性蠕变损伤本构模型，基于试验数据进行模型识别与验证，该模型既能反映整个蠕变过程中损伤演化规律，还能准确描述加速蠕变阶段非线性变形规律。研究成果对涉水高陡岩质边坡开挖卸荷后蠕变型滑坡灾害防控具有重要意义。

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	秦哲1
	刘永德1
	逄文龙1
	王旌2
	张润昌1
	杨旭旭1

关键词 ：岩石力学, 峰前卸荷, 循环侵水, 损伤演化, 变形特性, 蠕变模型

Abstract：To address the long-term stability of water-related slope projects such as water conservancy and hydropower after excavation and unloading，the CDT1305–2 microcomputer-controlled electronic pressure test system and the YAW–3000A electro-hydraulic pressure test system were used to carry out the uniaxial compression and graded load creep tests of yellow sandstone after different pre-peak unloading and cyclic water intrusion. Taking the undamaged state of the rock as the base state，the damage mechanics theory and the principle of strain equivalence after promotion are applied to construct the ，the macroscopic and microscopic coupled damage variable of the rock. The creep properties of the rock reloading under the action of different influencing factors are investigated，and the elastic-visco-plasticity theory is introduced to establish a new type of nonlinear creep damage model. The results show that：(1) After and pre-peak unloading，the internal vertical pores of the rock are gradually expanded and the transverse pores are compacted，resulting in the improvement of axial homogeneity，but after and pre-peak unloading，the internal vertical and transverse pores are further developed and widened，making the whole inhomogeneity of the rock more significant. (2) The rock creep damage angle α and the cracks gradually increase with the pre-peak unloading point，while the creep deformation shows a tendency to first decrease and then increase，and the level of creep stress increases with the number of cyclic water intrusion. (3) According to the deformation modulus evolution law in the rock creep process，the variables of global damage and local time-varying damage are defined to reveal the rock damage evolution mechanism，then the rock macroscopic and microscopic coupled damage variable are analysed and constructed，taking into account the effects of pre-peak unloading，cyclic water intrusion and creep loading. (4) A nonlinear creep damage constitutive model is established by combining the nonlinear components and damage processing，and the model identification and validation are carried out based on the experimental data，which can not only satisfy the whole creep process damage evolution law，but also accurately describe the nonlinear deformation law in the stage of accelerated creep. The results are of great significance for the prevention and control of creep-type landslide disaster following the excavation and unloading of wading and high steep rocky slopes.

Key words： rock mechanics pre-peak unloading cyclic water intrusion damage evolution deformation characteristic creep model

引用本文:

秦哲1，刘永德1，逄文龙1，王旌2，张润昌1，杨旭旭1. 不同峰前卸荷与循环侵水作用后的黄砂岩再承载蠕变特性研究[J]. 岩石力学与工程学报, 2024, 43(2): 358-370.
QIN Zhe1，LIU Yongde1，PANG Wenlong1，WANG Jing2，ZHANG Runchang1，YANG Xuxu1. Reloading experimental research on the creep properties of yellow sandstone samples considering pre-peak unloading and cyclic water intrusion damage. , 2024, 43(2): 358-370.

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http://rockmech.whrsm.ac.cn/CN/10.13722/j.cnki.jrme.2023.0644 或 http://rockmech.whrsm.ac.cn/CN/Y2024/V43/I2/358

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