关键词: 老黏土, 干湿循环, 浸泡作用, 强度衰减, 横向变形

Abstract: In order to explore the effect of dry-wet cycle and continuous soaking on the strength and deformation of the remolded Paleo-clay， a large number of triaxial compression tests were carried out systematically. Meanwhile， with the adoption of the mathematical statistics method， a strength and deformation degradation model of remodeled Paleo-clay subjected to dry-wet cycle and soaking was established. The results indicate that the cohesion decreases exponentially with the increasing dry-wet cycles， the early degradation range is large， the degradation trend slows down and gradually stabilizes. The crack develops from the periphery to the middle during the dry-wet cycle， the crack length， width and amount all increased， fracture development is one of the root causes of strength degradation， the shear strength decreases significantly with increasing dry-wet cycles， and the sample exhibits a strain hardening phenomenon. In addition， the cohesion degrades exponentially with increasing soaking time， as well， and the early degradation is obvious. The most significant degradation of peak strength occurs after soaking for 1 or 2 days. The proximal deformation is less pronounced due to the end effect， the lateral deformation is concentrated at a distance of 40~50mm from the top， and the lateral deformation increases with dry-wet cycles and soaking time. The degradation effect of dry-wet cycle on soil strength and deformation is obviously stronger than that of soaking effect.

Key words: Paleo-clay, dry-wet cycle, soaking effect, strength degradation, lateral deformation