不同应力路径下饱和黄土应力应变及孔压特性分析  

The Influence of Different Stress Path on Stress and Strain Relation and Pore Pressure Characteristic of Saturated Loess

作　　者：郅彬[1] 王番[1] 胡梦玲[1] 吴长炎 任兴[1] 

机构地区：[1]西安科技大学建筑与土木工程学院,西安710054

出　　处：《科学技术与工程》2016年第22期244-248,共5页Science Technology and Engineering

基　　金：国家自然科学基金(51508462)资助

摘　　要：通过GDS多应力路径试验仪,对饱和重塑黄土开展不同应力路径下的固结不排水试验。分析和探讨了常规三轴压缩、增p、减p和等p应力路径下饱和黄土的应力与应变关系和孔压特性变化规律。试验结果表明,不同固结方式所得到的应力峰值和稳定的孔隙压力明显不同。在等压固结方式下,减p、等p和增p路径所对应的应力峰值和稳定孔隙压力值依次增大;且减p、等p和增p三种路径下的应力峰值和稳定时的孔隙压力值均随初始固结应力增大;在偏压固结方式下,减p、等p和增p路径所对应的应力峰值依次减小,减p、增p路径所对应的稳定孔隙压力值大于等p路径,减p路径下的稳定孔隙压力值最大。By means of the GDS stress path test instrument, the tests were carried out with different stress paths under consolidated undrained condition on saturated remolded loess, which include conventional triaxial compression、increase pressure、keep constant pressure and decrease pressure, the influence of different stress path on stress and strain relation and pore pressure characteristic of saturated remolded loess is studied. The experiment results indicated that under different consolidation styles, the stress peak and pore pressure in stable condition are obviously different. Under the equipressure consolidation, the stress peak and pore pressure in stable condition are increasing in the order of increase pressure、keep constant pressure and decrease pressure, and increase with initial consolidation stress. Under the anisotropic consolidation, the stress peak is decreasing in the order of increase pressure、keep constant pressure and decrease pressure ,the pore pressure in stable condition corresponding to the increase pressure and decrease pressure path are more than that of the keep constant pressure, the pore pressure in stable conditon under the decrease pressure is the largest.

关 键 词：黄土 应力路径 三轴试验 孔压 应力应变关系 

分 类 号：TU411.3[建筑科学—岩土工程]