软质海崖蚀退是一种重大海岸灾害．通过研究软质海崖大规模蚀退机制，发现蚀退包括海蚀槽发育、坡体滑动与海崖再蚀退3个阶段；建立了软质海崖蚀退计算模型，并以福建省平潭岛软质海崖为例进行了计算．现场调查得到软质海崖单次大规模蚀退量位于0.39～0.92 m 之间，而采用理论计算该值位于0.67～0.90 m 之间．理论计算结果与现场调查结果大部分较为接近，表明该模型能够反映海崖的滑塌机理，且计算结果较为可靠．最后基于该计算模型分别探讨了海蚀槽半径、海崖高度和土体强度与海崖稳定性的关系．%The mechanism of soft sea cliff (SSC)recession,one of the most serious coastal geological hazards,has been studied.We find that 3 stages are included in the process of the recession.They are the development of sea erosion groove,slope sliding and sea cliff re-recession.A computational model for calculating the SSC recession scale at extreme sea conditions has been developed,and the SSC at Pingtan Island in Fujian province has been taken as a case study.The investigated results from the field show that each retreat distance is located between 0.39 m and 0.92 m,and the theoretical results lie between 0.67 m and 0.90m.Most of the theoretical and inves-tigated results are closer,which indicates that the model is reliable for the study of mechanism of SSC slumping. Based on the model,the relationships of the groove radius,sea cliff height and soil strength with the sea cliff stabil-ity are analyzed,respectively.
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