高边墙洞室劈裂破坏机制的试验与理论及计算分析研究

doi:10.13722/j.cnki.jrme.2022.0314

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摘要高边墙洞室的劈裂破坏现象已成为影响大型水电站地下厂房施工开挖安全的重要因素。为弄清劈裂破坏现象的形成机制，以瀑布沟水电站地下主厂房高边墙洞室为研究背景工程，开展真三维高地应力条件下高边墙洞室开挖卸荷三维地质力学模型试验，揭示高边墙洞室开挖卸荷的非线性变形特征与劈裂破坏规律。在地质力学模型试验研究的基础上，建立基于应变梯度的地下洞室劈裂破坏弹塑性损伤软化模型和岩体劈裂破坏准则，并据此依托ABAQUS软件开发地下洞室劈裂破坏计算分析程序，通过多工况数值模拟分析，有效揭示高边墙洞室劈裂破坏的产生条件和形成力学机制。研究表明：洞区初始最大主应力平行于洞轴向且其量值达到一定程度是产生劈裂破坏的重要条件；开挖卸荷过程中高边墙洞壁应力出现波峰与波谷间隔交替的振荡变化是引起劈裂破坏的根本力学成因，该研究成果为下一步进行高边墙洞室劈裂破坏防治提供了重要试验和理论依据。

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	李帆1
	张强勇1
	向文2
	丁炎志1
	薛天恩1
	张瑞新1

Abstract：The splitting failure of high sidewall caverns has become an important factor affecting the construction and excavation safety of the underground powerhouse of large hydropower stations. In order to clarify the formation mechanism of this phenomenon，taking the high sidewall cavern of the main powerhouse of Pubugou Hydropower Station as a case study，the true 3D geomechanical model test of excavation and unloading of high sidewall cavern under high in-suit stress is carried out，and the nonlinear deformation characteristics and splitting failure law of excavation and unloading of high sidewall cavern are revealed. On the basis of the model test，an elastic-plastic damage-softening model of splitting failure of underground cavern based on strain gradient and the failure criterion of splitting failure are established. Based on this，the calculation and analysis program of underground cavern splitting failure is developed based on ABAQUS software. Through the numerical simulation of multiple working conditions，the generation conditions and formation mechanism of splitting failure of high sidewall cavern are effectively revealed：the important condition of splitting failure is that the initial maximum principal stress is parallel to the direction of tunnel axis and the value reaches a certain degree. In the process of excavation and unloading，the oscillating change of the stress of the high sidewall is the fundamental mechanical cause of splitting failure. The research results provide an important experimental and theoretical basis for the prevention and control of splitting failure of high sidewall caverns.

Key words： rock mechanics high sidewall cavern splitting failure geomechanical model test strain gradient elastoplastic damage softening model numerical simulation of splitting failure

引用本文:

李帆1，张强勇1，向文2，丁炎志1，薛天恩1，张瑞新1. 高边墙洞室劈裂破坏机制的试验与理论及计算分析研究[J]. 岩石力学与工程学报, 2023, 42(7): 1662-1679.
LI Fan1，ZHANG Qiangyong1，XIANG Wen2，DING Yanzhi1，XUE Tianen1，ZHANG Ruixin1. Experimental，theoretical and computational analysis on splitting failure mechanism of high sidewall caverns#br#. , 2023, 42(7): 1662-1679.

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http://rockmech.whrsm.ac.cn/CN/10.13722/j.cnki.jrme.2022.0314 或 http://rockmech.whrsm.ac.cn/CN/Y2023/V42/I7/1662

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