随着黄土高原地区暖湿化加剧，湿度、降雨影响下含盐黄土体变形发展至失稳破坏的机理不明，成为地质灾害领域面临的新难题。数据以兰州地区黄土为研究对象，通过饱和盐溶液蒸汽平衡法控制吸附吸力、压力膜仪控制毛细吸力，获取广吸力下含盐黄土的土-水特征曲线，结合三轴剪切试验，开展吸附吸力（代表湿度）、毛细吸力（代表自由水）和溶质吸力（代表盐分）“三吸力”影响下非饱和黄土力学行为演化的研究。
", "ds_source": "目前，三轴试验是研究岩土体力学性质最广泛的试验方法。本试验采用西安康拓力仪器设备有限公司生产的 B&W 全自动非饱和三轴仪进行。该设备主要由内外双压力室、气压控制器、数据采集器等 3 部分组成。内压力室主要通过为试样提供孔隙气压和孔隙水压，从而产生所需的毛细吸力；外压力室主要提供围压和轴压，并通过管道和传感器与内压力室连接测定试样的体积变化量；气压来源于空压机并通过气压控制器控制；数据采集器连接高精度的传感器收集围压、轴压、孔隙气压、孔隙水压等试验参数。
", "ds_process_way": "（1）控制毛细吸力的三轴试验工作方案
\n分别以黄土、人工伊利石、人工高岭土为研究对象，采用非饱和土三轴剪切仪开展控制毛细吸力的三轴 固结不排水(CU) 剪切试验 。三轴试样尺寸为Ф38 mm×75 mm ，剪切速率统一设定为 0.3 mm/min ，以轴向应变达到 20%作为终止试验的标准。
\n①研究不同毛细吸力及 NaCl对黄土抗剪强度的影响：毛细吸力采用 70kPa、 100kPa、130kPa 三个吸力值，净围压采用 120kPa、220kPa、320kPa 三个压力级，试样采用含 0%NaCl 、2%NaCl 、4%NaCl 的黄土试样，共计 27 个试样。
\n②研究毛细吸力演化下其他盐分类型对黄土抗剪强度的影响：以 100kPa 的毛细吸力为代表，净围压采用 120kPa 、220kPa 、320kPa 三个压力级，试样采用含 0%NaCl 、2%NaCl 、4%NaCl 的黄土试样，共计 9 个试样。
\n③研究毛细吸力演化下黏土矿物对黄土抗剪强度的影响：以 100kPa 的毛细吸力为代表，净围压采用 120kPa 、220kPa 、320kPa 三个压力级，试样采用不掺盐的人工伊利石试样和不掺盐的人工高岭土试样，最后与不掺盐的黄土试样进行对比，共计 6 个试样。
\n（2）控制吸附吸力的三轴试验工作方案
\n黄土试样在 3.3MPa 、21.8MPa 、113.3MPa 三个吸附吸力养护完成后，将试样安装于三轴仪上进行固结不排水剪切试验，此时待剪试样已经在相应的吸附吸力下养护完成，因此在仪器中设置毛细吸力值为 0 ，为了避免毛细现象影响待测试样的吸附吸力值，试验过程中须关闭孔隙水压和孔隙气压阀门。剪切速率统一设定为 0.3mm/min ，以轴向应变达到 20%作为剪切破坏标准。净围压分别采用120kPa、220kPa、420kPa 三个压力级，待测试样为不掺盐、掺 2%NaCl、掺 4%NaCl、掺 1%NaHCO3 、掺 0.5%Na2SO4 、掺 0. 1%Na2CO3 的黄土，共 18 个试样。
", "ds_quality": "通过非饱和土三轴固结不排水剪切试验和直剪快剪试验，研究多种吸力控制下对非饱和黄土及人工土抗剪强度的影响规律，并比较不同剪切试验方法的量测误差。
", "ds_acq_start_time": "2022-01-01 00:00:00", "ds_acq_end_time": "2023-12-31 00:00:00", "ds_acq_place": "中国,甘肃", "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": 216710012, "ds_files_count": 0, "ds_format": "*.slidata", "ds_space_res": "", "ds_time_res": "", "ds_coordinate": "无", "ds_projection": "", "ds_thumbnail": "e78be724-ee96-4764-b822-714f344193f3.png", "ds_thumb_from": 2, "ds_ref_way": "", "paper_ref_way": "", "ds_ref_instruction": "", "ds_from_station": "", "organization_id": "bf138922-7121-438c-8d1b-19d5f751c907", "ds_serv_man": "李红星", "ds_serv_phone": "0931-4967592", "ds_serv_mail": "ncdc@lzb.ac.cn", "doi_value": "", "subject_codes": [ "140", "410.30" ], "quality_level": 0, "publish_time": "2026-05-21 11:40:30", "last_updated": "2026-05-21 11:47:56", "protected": false, "protected_to": null, "lang": "zh", "cstr": "11738.11.ncdc.loess.db7338.2026", "i18n": { "en": { "title": "Unsaturated Consolidation Undrained Triaxial Shear Test Dataset", "ds_format": "*.slidata", "ds_source": "Currently, the triaxial test is the most widely used experimental method for investigating the mechanical properties of geomaterials. This test employs the B&W fully automated unsaturated triaxial apparatus produced by Xi'an Kangtuoli Instrument Equipment Co., Ltd. The device primarily consists of three components: an inner and outer pressure chamber, an air pressure controller, and a data acquisition system. The inner pressure chamber is primarily responsible for applying pore air pressure and pore water pressure to the specimen, thereby generating the desired capillary suction. The outer pressure chamber provides confining pressure and axial pressure, and is connected to the inner pressure chamber via pipes and sensors to measure the specimen's volume change. The air pressure is supplied by an air compressor and regulated by the air pressure controller. The data acquisition system is connected to high-precision sensors to collect experimental parameters such as confining pressure, axial pressure, pore air pressure, and pore water pressure.", "ds_quality": "
The influence of various suction-controlled conditions on the shear strength of unsaturated loess and artificial soils was investigated through consolidated-undrained (CU) triaxial shear tests and direct quick shear tests, with a comparative analysis of the measurement errors between different shear testing methods.", "ds_ref_way": "", "ds_abstract": "
With the intensification of warming and humidification in the Loess Plateau region, the mechanism of deformation and instability of saline loess under the influence of humidity and rainfall is unknown, which has become a new challenge in the field of geological hazards. This article takes the loess in Lanzhou area as the research object, and controls the adsorption suction by saturated salt solution vapor equilibrium method and the capillary suction by pressure film instrument to obtain the soil water characteristic curve of saline loess under wide suction. Combined with triaxial shear test, the mechanical behavior evolution of unsaturated loess under the influence of adsorption suction (representing humidity), capillary suction (representing free water) and solute suction (representing salt) is studied.", "ds_time_res": "", "ds_acq_place": "Gansu, China", "ds_space_res": "", "ds_projection": "", "ds_process_way": "
(1) Triaxial Test Work Plan for Controlling Capillary Suctio\r\n
Loess, artificial illite, and artificial kaolinite were selected as study subjects. Unsaturated soil triaxial shear apparatuses were utilized to conduct consolidated-undrained (CU) shear tests under controlled capillary suction conditions. The triaxial specimens had dimensions of Φ38 mm × 75 mm, with a unified shear rate set at 0.3 mm/min. The termination criterion for the tests was defined as 20% axial strain.\r\n
①Investigation of the Impact of Different Capillary Suction Pressures and NaCl on the Shear Strength of Loess:Capillary suction pressures: 70 kPa, 100 kPa, 130 kPa.Net confining pressures: 120 kPa, 220 kPa, 320 kPa.Specimen compositions: Loess samples with 0% NaCl, 2% NaCl, and 4% NaCl.Total number of specimens: 27.\r\n
②Investigation of the Impact of Other Salt Types on the Shear Strength of Loess under Capillary Suction Evolution: Representative capillary suction pressure: 100 kPa.Net confining pressures: 120 kPa, 220 kPa, 320 kPa.Specimen compositions: Loess samples with 0% NaCl, 2% NaCl, and 4% NaCl.Total number of specimens: 9.\r\n
③ Investigation of the Impact of Clay Minerals on the Shear Strength of Loess under Capillary Suction Evolution:Representative capillary suction pressure: 100 kPa.Net confining pressures: 120 kPa, 220 kPa, 320 kPa.Specimen compositions: Unsalted artificial illite samples, unsalted artificial kaolinite samples, and unsalted loess samples for comparison.Total number of specimens: 6.\r\n
(2) Triaxial Test Work Plan for Controlling Adsorption Suction\r\n
After curing loess specimens under adsorption suction pressures of 3.3 MPa, 21.8 MPa, and 113.3 MPa, the specimens were installed in a triaxial apparatus for consolidated-undrained shear tests. Since the specimens had already been cured under the respective adsorption suction pressures, the capillary suction value in the apparatus was set to 0 kPa. To avoid the influence of capillary phenomena on the measured adsorption suction values, the pore water pressure and pore air pressure valves were closed during the test. The shear rate was uniformly set at 0.3 mm/min, with 20% axial strain as the failure criterion.Net confining pressures: 120 kPa, 220 kPa, 420 kPa.Specimen compositions:Unsalted loess,Loess with 2% NaCl、4% NaCl,、1% NaHCO₃、0.5% Na₂SO₄、0.1% Na₂CO₃.Total number of specimens: 18.", "ds_ref_instruction": "" } }, "submit_center_id": "ncdc", "data_level": 0, "recommendation_value": 0, "license_type": "https://creativecommons.org/licenses/by/4.0/", "doi_reg_from": "reg_local", "cstr_reg_from": "reg_local", "doi_not_reg_reason": null, "cstr_not_reg_reason": null, "is_paper_in_submitting": false, "ds_topic_tags": [ "非饱和", "固结不排水", "静三轴" ], "ds_subject_tags": [ "物理学", "工程地质学" ], "ds_class_tags": [], "ds_locus_tags": [ "中国", "甘肃" ], "ds_time_tags": [ 2022, 2023 ], "ds_contributors": [ { "true_name": "张彤炜", "email": "ztw@lzu.edu.cn", "work_for": "兰州大学", "country": "中国" }, { "true_name": "彭忠宝", "email": "1033987087@qq.com", "work_for": "兰州大学", "country": "中国" } ], "ds_meta_authors": [ { "true_name": "彭忠宝", "email": "1033987087@qq.com", "work_for": "兰州大学", "country": "中国" } ], "ds_managers": [ { "true_name": "张彤炜", "email": "ztw@lzu.edu.cn", "work_for": "兰州大学", "country": "中国" } ], "category": "灾害" }