分级循环加卸载下饱水细黄砂岩的变形破坏特征试验研究

doi:10.13722/j.cnki.jrme.2022.0904

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摘要针对富水隧道在不同施工阶段遭受的变幅荷载扰动下围岩损伤破坏问题，通过开展分级循环加卸载试验，分析循环加卸载过程中应力–应变滞回曲线、岩样变形参量和宏观破裂特征，揭示分级循环加卸载下饱水砂岩的变形破坏规律。结果表明：随加载幅值增加，滞回环迁移量先减小后增大，滞回环面积逐级增大，滞回环沿轴向应变呈“疏–密–疏”的发展；弹性模量呈“骤降→缓慢下降→加速下降”式逐级下降，泊松比呈“梯级式下降→相对稳定→回升”式U形变化规律。围压提高了岩样刚度和抵抗变形能力，整体弹性模量增大，加载起始泊松比增大，残余应变增大，但后期屈服段循环加卸载作用下弱化作用明显；荷载速率越快，加载啮合摩擦作用越明显，平均加卸载模量越大，岩样不可逆变形越小，但泊松效应不明显。围压增大，砂岩由拉剪复合破坏转变成压剪破坏；荷载速率越小，主裂隙越发育，贯通程度越高，破裂面冲刷程度较大。研究揭示的饱水砂岩变形破坏规律对富水隧道的围岩变形损伤和稳定分析具有显著的参考价值。

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	袁和川1
	2
	阿比尔的1
	张洁3
	丛宇4
	刘明维1
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	蒲运杰1
	2
	李浩田1
	2

关键词 ：岩石力学, 饱水砂岩, 分级循环加卸载, 荷载速率, 变形特征参数, 破坏特征

Abstract：For water-rich tunnel in different construction stages under variable amplitude load disturbance of surrounding rock damage problem，by conducting graded loops and unloading test，analysis of loops and unloading stress-strain hysteresis curve，in the process of rock deformation parameters and macro fracture characteristics，revealing the grading loops and uninstall the deformation and failure regularity of saturated sandstone. The results show that with the increase of loading amplitude，the migration of hysteresis loop decreases first and then increases，the area of hysteresis loop increases step by step，and the axial strain of hysteresis loop develops as“sparse-dense-sparse”. The elastic modulus decreases step by step in the form of“sudden drop-slow drop-accelerated drop”，and Poisson?s ratio changes in the form of“step by step drop-relatively stable-rise”. The confining pressure increases the stiffness and deformation resistance of rock samples，the overall elastic modulus，the initial Poisson?s ratio，and the residual strain increase，but the weakening effect is obvious under the cyclic loading and unloading of the late yield section. The faster the loading rate is，the more obvious the load meshing friction effect is，the greater the average loading and unloading modulus is，and the less the irreversible deformation of the rock sample is，but the Poisson effect is not obvious. With the increase of confining pressure，the failure of sandstone changes from tension shear composite failure to compression shear failure；The smaller the load rate is，the more developed the main fracture is，the higher the penetration degree is，and the greater the scouring degree of the fracture surface is. The deformation and failure law of saturated sandstone revealed by the study has significant reference value for the deformation，damage and stability analysis of surrounding rock of rich water tunnel.

Key words： rock mechanics saturated sandstone hierarchical cyclic loading and unloading loading rate deformation characteristic parameters failure characteristics

引用本文:

袁和川1，2，阿比尔的1，张洁3，丛宇4，刘明维1，2，蒲运杰1，2，李浩田1，2. 分级循环加卸载下饱水细黄砂岩的变形破坏特征试验研究[J]. 岩石力学与工程学报, 2023, 42(S2): 3943-3955.
YUAN Hechuan1，2，Abi Erdi1，ZHANG Jie3，CONG Yu4，LIU Mingwei1，2，PU Yunjie1，2，LIN Haotian1，2. Experimental study on deformation and failure characteristics of saturated sandstone under graded cyclic loading and unloading. , 2023, 42(S2): 3943-3955.

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http://rockmech.whrsm.ac.cn/CN/10.13722/j.cnki.jrme.2022.0904 或 http://rockmech.whrsm.ac.cn/CN/Y2023/V42/IS2/3943

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