糯扎渡心墙坝反滤料的静动力特性研究

Study on Static and Dynamic Characteristics of Anti-filter Material in Nuozhadu Dam

采用糯扎渡心墙反滤料进行静动力三轴试验。静力试验分别进行了K0固结和三向等压固结下的排水剪切试验,结果表明,两者的排水剪强度大致相同;K0固结排水剪试验的初始弹性模量Ei小于等压固结排水剪试验在相同围压下的初始弹性模量,体积模量则反之。动强度试验则表明,不同破坏标准对动强度影响明显,液化标准、应变破坏标准下的强度均大于极限平衡破坏标准下的强度,且随着固结比的增大其"地震总应力"抗剪强度也增大。

The static and dynamic triaxial tests are carried out by using the anti-filter material of Nuozhadu Dam. In the static test, K0 CD triaxial test and isotropic CD triaxial test are performed. The results show that the strength of K0 CD triaxial test is roughly equal to that of isotropic CD triaxial test; The initial elastic modulus Ei obtained from K0 CD triaxial test is less than that obtained from isotropic CD triaxial test, but the bulk modulus is reverse. The dynamic triaxial tests show that the different failure criteria have the obvious influence on the dynamic strength. The dynamic strengths un- der liquefaction criterion and strain failure criteria are larger than the strength under limit equilibrium failure criteria, and with the increase of consolidation ratio, the shear strength of total earthquake stress also increases.