9. 对土体施加围压sigma3,再施加偏压sigma1-sigma3,在偏压作用下,土体产生孔压增量delta u,由偏压引起的有效应力增量应为:
(A) delta sigma1' =sigma1-sigma3-delta u ; delta sigma3' =-delta u
(B) delta sigma1' =sigma1-delta u ; delta sigma3' =sigma3-delta u
(C) delta sigma1' =sigma1-sigma3-delta u ; delta sigma3' =delta u
(D) delta sigma1' =delta u ; delta sigma3' =-delta u
答案给B, 对?
note : 题目问的是由 偏压 引起的有效应力 增量…