循环剪切吸水条件下饱和砂土的应力应变规律 - 地震工程与工程振动.PDF

30 6 Vo.l 30 No. 6 2010 12 JOURNAL OF EARTHQUAKE ENGINEERING AND ENG INEERING V IBRATION Dec. 2010 : 2010) 0601740 1, 2 1 王富强 , 张建民 ( 1. , 100084; 2. , 100011) : , , , , , : , ; , : ; ; ; : P31 . 98 : A Stressstrain response of sau trated sand during cyclic water ab sorp tion sh earing 1, 2 1 WANG Fuqiang , ZHANG Jianm in ( 1. State K ey Laboratory ofHydroscience and Engineering, T singhua U niversity, Beijing 100084, China; 2. Hydropow er and W ater Resources P lanning Design G eneral Institute, Beijing 100011, China) Abs tract: In many cases of boundary value problem s in geotechnical earthquake engineering, saturated sand is not in a comp letely undrained condition; it may behave as in different drainage conditions due to the factors, such as soil properties or different level types. In order to study the influence of drainage conditions, w ater absorption tests of saturated sand under cyclic shearing w ere carried out using porew ater injection control system, w hich was new ly developedw ith the help of cyclic triaxial devices. It is found that the cyclic resistance or cyclic strength of speci mens decreases because ofw ater absorption, w hile the axial strain is enlarged for same cyclic shearing history. The liquefaction strength dim inishes and the axial strain enlarges significantly w ith the increase ofw ater absorption rate. F inally, the mechanism of stressstrain characteristics of saturated sand underw ater absorption shearing is revealed on the basis of test resu lts and prio