不同应力状态土的动强度问题

On dynamic strength of soil under different stress conditions

土的动强度与静强度之关系 ,国内外学者的研究成果不尽一致 .通过工程实践及试验 ,土的动强度与土体的原位应力状态直接相关 .当K0 (=σ1/σ3)等于 1 0时 ,土的动强度最低 ;不论K0 >1 0或K0 <1 0时 ,即土体存在偏应力时 ,土的动强度都随之增长 .K0 又随土的固结状态之不同而不同 .因此 ,研究土的动强度必须与研究土的原位应力 (土的固结状态 )同时进行 。

The relationship between dynamic and static strength of soil is worth discussing.The engineering practice and test show that the dynamic strength of soil is directly related with the in_situ stress conditions.When K 0(= σ 1/ σ 3)=1 0,the dynamic strength of soil is the lowest.The dynamic strength will increase if there is a diviative stress,whatever K 0>1 0 or K 0<1 0.And K 0 varies with the consolidation state of soil.Accordingly,the dynamic strength of soil should be studied simultaneously with the in_situ stress of soil.And a statisfying result can be achieved if the test of dynamic strength of soil is carried out under the in_situ stress condition.