摘要
采用共振柱试验方法,提出了一个非均等固结下砂土最大动剪切模量新的增长公式。试验和分析结果表明,描述非均等固结对最大动剪切模量影响较为合适的方式是以幂函数模式建立非均等固结下最大动剪切模量相对于均等固结下最大动剪切模量的增量ΔGm/G0,m和固结比的增量kc-1 之间的关系,即ΔGm/G0,m=C·(kc-1)B。系数B 是一个远小于1 的数,表明最大动剪切模量在kc 接近1 时增长较快,在kc继续增大时增长变慢并趋于平缓,不同于Hardin 公式中最大动剪切模量与kc 间近似直线的增长关系。对文中的两种砂,系数C 为0.55-0.74,表明非均等固结对土最大动剪切模量有重要和不可忽视的影响,kc>1 下最大动剪切模量较kc=1 时增长的程度明显比Hardin 公式要大。
A new formula for evaluating the maximum dynamic shear modulus of the sand under the anisotropic consolidation is presented by using the resonant column method. The test results indicate that the suitable form of the new formula is to use the power function to describe the relation between the relative increment of the maximum dynamic shear modulus due to the anisotropic consolidation, δGm/G0,m, and the increment of the consolidation ratio, kc-1, i.e., δGm/G0,m = C·(kc-1)B. The coefficient B is far less than 1, which means the maximum dynamic shear modulus increases rapidly when kc is near to 1 and then increases slowly, much making a great difference from the nearly straight relation between the maximum dynamic shear modulus and kc as in Hardin and Black's formula. The coefficient C is 0.55-0.74 for two kinds of sands in the paper, which indicates that the increase of the maximum dynamic shear modulus due to kc>1 is significantly larger than that described in Hardin and Black's formula.
出处
《岩土工程学报》
EI
CAS
CSCD
北大核心
2005年第3期264-269,共6页
Chinese Journal of Geotechnical Engineering
基金
国家科技部
国家自然科学基金和地震学联合基金资助项目(102033)
