循环荷载下温州超固结软土动强度与变形分析-自然灾害学报.pdfVIP

18 4 Vo.l 18 No. 4 2009 8 JOURNAL OF NATURAL D ISASTERS Aug. 2009 : 1004- 4 74( 2009) 04- 012 - 07 1 2 1 王 军, 陈春雷, 丁光亚 ( 1. , 32 027; 2. , 32 000) : , , ; , , , , , , , : ; ; ; : O319. 6 : A Analy sis of dynam ic strength and deform ation of W enzhou overconsolidated soft clay under cyclic loading 1 2 1 WANG Jun , CHEN Chun-lei, D ING Guang-ya ( 1. Architecture and Civ ilEng ineering College, W enzhou University, Wenzhou 32 027, China; 2. W enzhou U rban Construction Design Institute, W enzhou 32 000, China) Abs tract: The dynam ic behavior ofW enzhou overconsolidated soft clay under cyclic load ing w as studied by cyclic triaxial tests. The change of dynam ic stress, porew ater pressure and axial strain of norma,l light overconsolidated, and strong overconsolidated soft clay w ith oyclic numberw ere investigated respectively. It is observed that negative pore w ater pressure is generated for overconsolidated clay under cyclic loading. For light overconsolidated clay, the negative pore pressure turnspositive w ith the increase of cyclic number. How ever, for strong overconsolidated clay, the pore pressure is alw ays negative. The dynam ic strain of the clay accumu latesmore slow ly, turn ing strain decrea- ses, critical cyclic stress ratio and dynam ic strength increase alongw ith the increase of overconsolidated ratio. Com- pared w ith normal consolidated clay, the dynam ic strength curves of overconsolidated clay are smootherw ith a less degradation rate. K ey w ord s: cyclic loading; overcons