岩石隧道开挖通常会引起初始应力释放，这与经典三轴压缩试验中的应力路径不同。为了分析开挖扰动区的渗透率变化，采用两种不同的应力路径，例如将经典的三轴压缩和围压卸载应用于花岗岩，并使用气体作为传输介质测量不同损伤程度的渗透率，探讨了变形和破坏机制的差异及其对气体渗透率变化的影响。\n
试验结果表明，卸围压试验样品的横向变形明显大于经典三轴压缩试验。与经典三轴抗压试验渗透率递减—增加过渡不同，卸围压试验渗透率总体呈递增趋势。两个测试中的渗透率在接近失效时显着增加，并达到相同的数量级。两种应力路径下渗透率演化的差异直接归因于它们不同的变形机制。测试结果可以提供对地下开挖过程中渗透性能的新认识。", "ds_source": "
数据来源于试验测量。", "ds_process_way": "
采用两种不同的应力路径并使用气体作为传输介质测量不同损伤程度的渗透率。", "ds_quality": "
数据质量良好。", "ds_acq_start_time": "2019-05-01 00:00:00", "ds_acq_end_time": "2019-05-31 00:00:00", "ds_acq_place": "湖北武汉", "ds_acq_lon_east": null, "ds_acq_lat_south": null, "ds_acq_lon_west": null, "ds_acq_lat_north": null, "ds_acq_alt_low": null, "ds_acq_alt_high": null, "ds_share_type": "apply-access", "ds_total_size": 32467, "ds_files_count": 3, "ds_format": "excel", "ds_space_res": null, "ds_time_res": "", "ds_coordinate": "无", "ds_projection": "", "ds_thumbnail": "f8a72fcd-f307-4053-bbb3-94ac259b8c27.jpg", "ds_thumb_from": 0, "ds_ref_way": "胡大伟，CPUT 中渗透率和体积应变的变化测试数据集，国家冰川冻土沙漠科学数据中心(http://www.ncdc.ac.cn/)，2022，doi：10.12072/ncdc.nieer.db2807.2023", "paper_ref_way": "", "ds_ref_instruction": "为保障平台科技资源的权益、扩展平台中心的服务、提升科技资源的应用潜力，请资源使用者在使用资源所产生的研究成果中（包括公开发表的论文、论著、数据产品和未公开发表的研究报告、数据产品等成果），明确注明资源来源和资源作者。", "ds_from_station": null, "organization_id": "57a5e5a3-6fc5-43b5-a2ba-1f2ca54b7727", "ds_serv_man": "敏玉芳", "ds_serv_phone": "0931-4967596", "ds_serv_mail": "ncdc@lzb.ac.cn", "doi_value": "", "subject_codes": [ "170.50" ], "quality_level": 3, "publish_time": "2023-04-28 17:53:04", "last_updated": "2023-07-03 02:10:10", "protected": false, "protected_to": "2025-01-01 00:00:00", "lang": "zh", "cstr": "11738.11.NCDC.NIEER.DB2807.2023", "i18n": { "en": { "title": "Data set of permeability and volume strain changes in CPUT", "ds_format": "", "ds_source": "
<p>   The data comes from the test measurement.\n <p>   The data quality is good.\n <p>   Rock tunnel excavation usually causes initial stress release, which is different from the stress path in the classic triaxial compression test. In order to analyze the change of permeability in the excavation disturbed area, two different stress paths are adopted, such as applying the classical triaxial compression and confining pressure unloading to granite, and using gas as the transmission medium to measure the permeability with different damage degrees. The differences between deformation and failure mechanisms and their effects on the change of gas permeability are discussed.\nThe test results show that the transverse deformation of the sample in the unloading confining pressure test is obviously larger than that in the classical triaxial compression test. Different from the decline increase transition of the permeability in the classic triaxial compression test, the permeability in the unloading confining pressure test shows an overall increasing trend. Permeability in both tests increased significantly near failure and reached the same order of magnitude. The difference of permeability evolution under two stress paths is directly attributed to their different deformation mechanisms. The test results can provide a new understanding of the permeability during underground excavation.
", "ds_time_res": "", "ds_acq_place": "Wuhan, Hubei", "ds_space_res": "", "ds_projection": "", "ds_process_way": " <p>   Two different stress paths are adopted and gas is used as the transmission medium to measure the permeability of different damage degrees.\n