平面蠕变仪的改造及黄土平面蠕变试验  

Reformation for Plane Creepmeter and Plane Creep Tests of Loess

作　　者：胡连信 骆亚生[1] 

机构地区：[1]西北农林科技大学水利与建筑工程学院,陕西杨凌712100

出　　处：《人民黄河》2015年第5期122-124,共3页Yellow River

基　　金：国家自然科学基金资助项目(51178392)

摘　　要：在岩土工程界,对于一些平面应变状态下的黄土蠕变沉降问题,采用三轴蠕变或单向压缩试验不能准确反映其应力应变与时间的关系。为此,先将真三轴仪改造为平面应变仪,然后改进成为平面蠕变仪,保证试样在整个试验过程中处于平面应变状态,且能准确反映其蠕变过程。利用该仪器开展了黄土固结平面蠕变试验,试验结果表明,在偏应力较小时平面蠕变轴向形变量及稳定时间均小于在偏应力较大情况下的值,试样侧面形变规律类似轴向形变规律。同时,试验结果也验证改造后的仪器能较好地应用于平面蠕变相关试验。In the geotechnical engineering, it isn＇ t such accurate to adopt triaxial creep test or unidirectional compression test to reflect the relationship of σ-ε-t as to the creep settlement problems of loess in plane strain conditions. Therefore, the true-triaxial apparatus was transformed into plane creepmeter, by which a series of plane compression and creep tests of loess were conducted. The results show that as for the axial deformation, the value of deformation and the time for stabilization under the low deviator stress is larger than the value when the deviator stress is high, while the law of less lateral deformation resembles the one of axial deformation. At the meantime, the results can also prove the fact that the reformed apparatus can suit plane creep test well.

关 键 词：平面蠕变 仪器改造 轴向形变 侧向形变 黄土 

分 类 号：TV131.6[水利工程—水力学及河流动力学] TU411.7[建筑科学—岩土工程]