宫凤强, 代金豪, 王明洋, 等. 2022. 高地应力“强度 & 应力”耦合判据及其分级标准[J]. 工程地质学报, 30(6): 1893-1913. doi: 10.13544/j.cnki.jeg.2022-0644.
    引用本文: 宫凤强, 代金豪, 王明洋, 等. 2022. 高地应力“强度 & 应力”耦合判据及其分级标准[J]. 工程地质学报, 30(6): 1893-1913. doi: 10.13544/j.cnki.jeg.2022-0644.
    Gong Fengqiang, Dai Jinhao, Wang Mingyang, et al. 2022. "Strength & Stress" coupling criterion and its grading standard for high geostress[J]. Journal of Engineering Geology, 30(6): 1893-1913. doi: 10.13544/j.cnki.jeg.2022-0644.
    Citation: Gong Fengqiang, Dai Jinhao, Wang Mingyang, et al. 2022. "Strength & Stress" coupling criterion and its grading standard for high geostress[J]. Journal of Engineering Geology, 30(6): 1893-1913. doi: 10.13544/j.cnki.jeg.2022-0644.

    高地应力“强度 & 应力”耦合判据及其分级标准

    "STRENGTH & STRESS" COUPLING CRITERION AND ITS GRADING STANDARD FOR HIGH GEOSTRESS

    • 摘要: 众多地下工程建设始终处于高地应力环境中,岩体初始应力是地下工程围岩变形破坏的先天条件和主导因素。“高地应力”术语及概念出现和地下工程围岩特殊破坏现象紧密联系,属于工程概念范畴。随着地下工程数量越来越多并逐渐向深部发展,高地应力诱发的围岩破坏现象日益显著,严重影响工程稳定性。现有的高地应力定量分级判据多采用强度应力比值形式,没有充分考虑岩石强度、应力两个指标的绝对值大小和耦合关系。本文在讨论现有分级判据、收集实际工程案例数据以及分析高地应力破坏现象显现过程的基础上,提出了高地应力“强度& 应力”耦合判据及其定量分级标准。高地应力“强度& 应力”耦合判据的表现形式为3条考虑岩石饱和单轴抗压强度Rc以及和初始最大主应力σ1耦合的边界线,边界线以内的区域为高地应力区、边界线以外的区域为低地应力区。该判据特点是既考虑初始最大主应力、岩石饱和单轴抗压强度的绝对值边界条件,同时也考虑两者耦合区间。研究结果表明:基于二维尺度提出的“强度& 应力”耦合判据,针对86个典型地下工程的高地应力判别结果和工程现场高地应力显现形式完全相符,可以在实际地下工程中推广应用。基于“强度& 应力”耦合判据的高地应力区分级标准能较好地判别围岩破坏现象的剧烈程度,可为工程灾害的预防提供参考。

       

      Abstract: The construction of many underground projects can be in high geostress environment,and the initial geostress is the precondition and dominate factor for deformation and failure of underground surrounding rock. The term and concept of "high geostress" are closely related to the abnormal failure of surrounding rock in underground engineering and belong to the engineering concept category. The failure of surrounding rock attributed to high geostress is becoming increasingly significant with increasing burial depth of underground projects,which seriously influences the stability of engineering projects. Although various quantitative classification criteria have been proposed,they are mostly established in the form of rock strength to geostress ratio,without fully considering the absolute magnitude and coupling relationship between rock strength and geostress. In this paper,a "strength & stress" coupling criterion and its quantitative grading standard for high geostress rock failure are proposed via discussing the existing classification criteria,collecting the related engineering cases,and analyzing the failure progress of high geostress rock. This coupling criterion is expressed by 3 boundary lines considering the saturated rock uniaxial compressive strength Rc and the initial maximum principal stress σ1. The area enclosed by the boundary lines represents the high geostress zone,and that outside the boundary lines represents the low geostress zone. The coupling criterion is characterized by considering both the absolute boundary conditions of Rc and σ1,as well as their coupling interval. Through an evaluation of geostress grades in 86 typical underground projects,it is found that the judgments of this two-dimensional "strength & stress" coupling criterion are favorably consistent with the in situ rock failure phenomena. Thus,this criterion can be applied to the practical underground engineering. Moreover,the rating standards of high geostress zone of this "strength & stress" coupling criterion can better identify the failure intensity of surrounding rock,which can provide a reference for the prevention of engineering disasters.

       

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