基于新型真三轴仪的非饱和土试验研究  

Experimental Study of Unsaturated Soil by True Tri-Axial Apparatus

作　　者：许萍[1] 邵生俊[1] 李佳坤[1] 

机构地区：[1]西安理工大学土木建筑工程学院,陕西西安710048

出　　处：《西安理工大学学报》2013年第1期50-56,共7页Journal of Xi'an University of Technology

基　　金：国家自然科学基金资助项目(41272320);教育部高等学校博士学科点专项科研基金项目(20106118110011)

摘　　要：基于西安理工大学研制和开发的真三轴仪,针对现有压力室密封性差以及试样的孔隙水压力、孔隙气压力、试验过程中液压囊加载侧向变形的准确控制和量测等缺陷,研发了一种轴向刚性加载、侧向柔性加载的真三轴仪压力室试样密封和侧向变形量测装置,实现了试样有效密封,试样孔隙水、气压力和侧向变形的独立控制和量测。开展了非饱和重塑黄土在不同固结应力、不同中主应力比控制基质吸力条件下的真三轴试验,其结果验证了该技术具有良好的应用价值。Based on the research and development of the true tri-axial apparatus in Xi＇an University of Technology,aiming at the poor sealing of existing pressure chamber,being difficult to controlling and measuring the pore-water pressure,pore-air pressure of the specimen and lateral deformations in the two principal stress direction during testing,a true tri-axial pressure cell sealing and lateral deformation measuring device with rigid axial loading and lateral flexible loading has been developed.The device can achieve the specimen tightly sealed,independently-controlled and independently-measured on pore-water pressure,pore-air pressure and lateral deformations in the two principal stress direction.Also,the true tri-axial tests of unsaturated heavy plastic loess in the case of controlling matrix in different consolidated stresses and different middle principal stress ratios is carried out,and the results verifies that this technology is of better practical application value.

关 键 词：真三轴仪 试样密封 孔隙水、气控制与量测 侧向变形量测 非饱和土试验 

分 类 号：TU41[建筑科学—岩土工程]