主应力轴循环旋转下饱和黏土累积孔压显式模型  

EXPLICIT MODEL FOR CUMULATIVE PORE PRESSURE OF SATURATED CLAY UNDER CYCLIC ROTATION OF PRINCIPAL STRESS AXIS SUBJECTED TO CYCLIC LOADING

作　　者：姚兆明[1,2] 赵小龙[1] 方庆 

机构地区：[1]t安徽理工大学土木建筑学院,安徽淮南232001 [2]中煤矿山建设集团有限责任公司,合肥230000 [3]江苏省岩土工程公司,南京210002

出　　处：《工业建筑》2014年第3期85-90,118,共7页Industrial Construction

基　　金：安徽省自然科学基金项目(1408085ME79);安徽高等学校自然科学基金重点项目(KJ2012A072);国家博士后基金项目(2013M531493);住房和城乡建设部项目(2012-R3-12);安徽省住房和城乡建设厅项目(2012YF-25)

摘　　要：交通荷载下饱和黏土累积孔压消散是导致交通荷载下路基沉降的重要因素。在详细介绍黏土空心圆柱试样制作过程的基础上,在各向等压条件下,分别对黏土试件在100,150,200 kPa压力下固结,而后进行主应力轴旋转角连续变化范围分别为[-15°,15°]、[-30°,30°]、[-45°,45°]和[-60°,60°]的不排水循环加载试验,循环次数为10 000次。得到了循环累积孔压的变化受静偏应力、初始固结压力及空心圆柱试样主应力轴连续旋转角影响的规律。运用修正动偏应力水平来考虑初始静偏应力和动偏应力对不排水累积孔压的影响,建立了常剪应力循环主应力轴偏转角循环加载下累积孔压模型。通过非各向等压固结循环扭剪试验累积孔压值对所建立的累积孔压模型的正确性进行验证。The cumulative pore pressure dissipation of saturated clay is an important factor in the settlement of roadbed under traffic load. According to the characteristics of making the hollow cylindrical specimens of saturated clay, it was introduced the fabrication process of saturated clay hollow cylindrical specimen in detail. The specimens were consolidated under 100 kPa,150 kPa, and 200 kPa, then, the undrained cyclic loading test was done with the change in the principal stress axis rotation continuous range being[-15°,15°]、[-30°,30°]、[-45°,45°] and [-60°,60°] , therefore, the effect rules that were confining pressure, the principal stress axis rotation angle and the static deviator stress respectively on the cycle cumulative pore pressure were obtained. Using the modified dynamic deviator stress level to consider the effect of initial static deviator stress and dynamic deviator stress on the undrained cumulative pore pressure, the cumulative pore pressure model of constant shear stress cycle deviation angle of principal stress axis under cyclic loading was established. Through the cumulative pore pressure value of non-isotropic consolidation cyclic torsional shear test, the correctness of the established cumulative pore pressure model was verified.

关 键 词：常广剪应力 主应力轴循环旋转 循环扭剪试验 饱和黏土 累积孔压显式模型 

分 类 号：TU442[建筑科学—岩土工程]