Development of a strain/temperature/suction-controlled true triaxial testing device for modeling unsaturated soil behavior under multi-axial stress states

开发应变/温度/吸力控制的真三轴试验装置，用于模拟多轴应力状态下非饱和土的行为

• 批准号: 0216545
• 负责人: Laureano Hoyos
• 金额: --
• 依托单位: University of Texas at Arlington
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2002
• 资助国家: 美国
• 起止时间: 2002-08-01 至 2007-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0216545&HistoricalAwards=false
• 关键词: Development; strain; temperature; suction; controlled

A true triaxial testing apparatus will be developed to test 3-in per side, cubical specimens of unsaturated soil under simultaneous strain-, temperature- and suction-controlled conditions. The equipment will be a mixed-boundary type of device, with the specimen seated on top of an arrangement of nine 5-bar ceramic disks and between five flexible membranes on the remaining sides of the cube. The device will feature two independent pore-air and pore-water pressure control/monitoring systems. Several specimens of silty sand will be subjected to a wide range of simple-to-complex stress paths for calibration and validation of the proposed device. Suction states in the specimens will be induced via the axis-translation technique. Successful completion of this development effort will considerably advance the existing knowledge and fundamental understanding of the stress-strain-strength behavior of unsaturated soils. The device will be the first of its kind to be ever implemented at any academic setup in the US, and will constitute a major state-of-the-art instrumentation for research and integrated research/education activities at UTA in the geomechanics discipline. Development of this equipment is also aimed at promoting partnerships between academic researchers and private instrument developers interested in the advancement of the unsaturated soil mechanics discipline.

将开发一种真三轴试验装置，在同时控制应变、温度和吸力的条件下，对每侧3英寸的非饱和土立方体试样进行试验。 该设备将是一个混合边界类型的设备，与标本坐在一个安排的9个5酒吧陶瓷盘和五个灵活的膜之间的立方体的其余方面的顶部。 该装置将具有两个独立的孔隙空气和孔隙水压力控制/监测系统。 几个样本的粉质砂将受到广泛的简单到复杂的应力路径的校准和验证所提出的设备。 将通过轴平移技术在试样中诱导抽吸状态。 成功完成这一发展工作将大大推进现有的知识和基本的理解的应力-应变-强度行为的非饱和土。 该设备将是第一个在美国任何学术机构实施的同类设备，并将构成UTA地质力学学科研究和综合研究/教育活动的主要最先进仪器。 该设备的开发还旨在促进学术研究人员和对非饱和土力学学科发展感兴趣的私人仪器开发商之间的伙伴关系。