超深钻岩芯地质环境真三轴试验装置研制及应用

doi:10.16285/j.rsm.2022.1697

岩土力学 ›› 2023, Vol. 44 ›› Issue (7): 2161-2169.doi: 10.16285/j.rsm.2022.1697

超深钻岩芯地质环境真三轴试验装置研制及应用

石磊^{1, 2}，张希巍^{1, 2}

1. 东北大学深部金属矿山安全开采教育部重点实验室，辽宁沈阳 110819；2. 东北大学深部工程与智能技术研究院，辽宁沈阳 110819

收稿日期:2022-10-28 接受日期:2022-12-14 出版日期:2023-07-17 发布日期:2023-07-16
通讯作者: 张希巍，男，1976年生，博士，教授，主要从事试验岩石力学方面的研究工作。E-mail: zhangxiwei@mail.neu.edu.cn E-mail:shileizl@163.com
作者简介:石磊，男，1992年生，博士，博士后，主要从事硬岩脆性破裂方面的研究工作。
基金资助:
国家重点研发计划（No.2018YFC0407006）；教育部基本科研业务费资助项目（No.N2101035）。

Development and application of an ultra-deep drilling core geological environment true triaxial apparatus

SHI Lei^{1, 2}, ZHANG Xi-wei^{1, 2}

1. Key Laboratory of Ministry of Education on Safe Mining of Deep Metal Mines, Northeastern University, Shenyang, Liaoning 110819, China; 2. Institute of Deep Engineering and Intelligent Technology, Northeastern University, Shenyang, Liaoning 110819, China

Received:2022-10-28 Accepted:2022-12-14 Online:2023-07-17 Published:2023-07-16
Supported by:
This work was supported by the National Key Research and Development Program of China (2018YFC0407006) and the Fundamental Research Funds for the Central Universities of China (N2101035).

摘要/Abstract

摘要： 为研究超深部岩芯的变形与破裂行为，研制了超深钻岩芯地质环境真三轴试验装置。该装置主要用于测试超深钻岩芯加工的试样（25 mm×25 mm×50 mm）在真三轴应力下的全应力−应变行为、循环加卸载破裂行为和时效变形行为，解决了试样变形测量不准确、加载系统低刚度、高油压与作动器压力互相干涉等技术难题。利用该装置完成了山东黄金集团三山岛金矿西岭副井工勘孔岩芯真三轴应力下力学行为的测试，发现：循环加卸载弱化了试样的脆性破裂特征，诱导3个方向的变形表现出各向异性；分级蠕变试验中，试样3个方向的变形均表现出初始蠕变、稳态蠕变、加速蠕变，且3个方向的蠕变速率均随偏应力的增加近似线性增加。

关键词: 超深钻岩芯, 真三轴试验, 全应力?应变, 循环加卸载, 时效破坏

Abstract: To study the deformation and fracture behavior of ultra-deep drilling core, an ultra-deep drilling core geological environment true triaxial apparatus was developed. The apparatus was mainly designed to obtain the complete stress-strain behavior, cyclic loading and unloading fracture behavior, and time-dependent deformation behavior of specimens (25 mm×25 mm×50 mm) processed by ultra-deep drilling cores under a true triaxial stress, mainly solving the technical problems such as inaccurate measurement of specimen deformation, low stiffness of the apparatus, mutual interference between pressure chamber oil pressure and actuator pressure. The device was used to test the mechanical behavior of the cores from the Xiling engineering exploration hole at the Sanshandao Gold Mine of Shandong Gold Group under the true triaxial stress. It was found that the true triaxial cyclic loading and unloading weakened the brittle fracture characteristics of the specimen, and induced deformation in three directions to show anisotropy. In the multi-stage true triaxial creep test, the deformation of specimen in three directions showed primary creep, steady creep, and accelerated creep. The creep strain rates in the three directions increased approximately linearly with deviatoric stress.

Key words: ultra-deep drilling core, true triaxial test, complete stress-strain, cyclic loading and unloading, time-dependent failure

中图分类号:

TU415

石磊, 张希巍, . 超深钻岩芯地质环境真三轴试验装置研制及应用[J]. 岩土力学, 2023, 44(7): 2161-2169.

SHI Lei, ZHANG Xi-wei, . Development and application of an ultra-deep drilling core geological environment true triaxial apparatus[J]. Rock and Soil Mechanics, 2023, 44(7): 2161-2169.

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超深钻岩芯地质环境真三轴试验装置研制及应用

Development and application of an ultra-deep drilling core geological environment true triaxial apparatus

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