天然沉积结构性黏土的不排水强度性状

通过对福州天然沉积黏土原状样及不同初始含水率重塑样进行三轴固结不排水剪切试验,探讨土结构性对天然沉积黏土强度性状的影响规律及作用机理。研究结果表明：结构性对天然沉积土固结不排水抗剪强度的作用程度受固结压力大小影响可以分为3个阶段：固结压力小于屈服压力阶段,不排水抗剪强度主要由土结构性控制,与应力水平基本无关；土结构逐渐屈服阶段,固结压力大于屈服压力,不排水抗剪强度随固结有效应力的增大逐渐趋于重塑样的强度线；土结构性影响消失阶段,原状样的不排水抗剪强度随固结有效应力的增长规律与重塑样相同。

Undrained shear strength behaviour of natural sedimentary structural clay

Isotropically consolidated undrained triaxial compression shear tests are performed on both undisturbed and remolded Fuzhou clays to compare their difference in mechanical behavior caused by soil structure. It is understood that the strength behavior of natural clays can be classified into three regimes: (a) the pre-yield regime, in which the undrained shear strength is controlled mainly by soil structure; (b) the transitional regime, in which the strength behavior is affected by both soil structure and stress level, and it gradually coincides with that of the remolded specimens as the soil structure gradually damages with the increase in applied stress; (c) the destructured regime, in which the strength behavior becomes the same as that of the remolded specimens.