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茅洲河河口在2011年发生一次大型堤岸滑坡,河堤向河道内滑移最大40m,塌陷深度最大4m,滑坡范围内出现多处宽大裂缝,河道内淤泥隆起。本文针对该软土堤岸滑塌的特征,分析了荷载及水位变化对岸坡稳定性的影响,并进行了有限元数值模拟,阐明了岸坡失稳破坏的机理,最后对滑塌后的土体强度进行了现场原位测试,分析其强度变化及边坡滑动面的位置,并与有限元计算结果进行了比较。本文的研究成果对于软土地区类似的堤岸工程有一定的参考价值。
In 2011, a large embankment landslide occurred at the mouth of Maozhou estuary. The embankment slides up to 40m in the river course and has a maximum collapse depth of 4m. There are many large cracks in the landslide area, and silt uplift in the river course. In this paper, according to the characteristics of the slump of soft clay embankment, the influence of load and water level changes on the stability of slope is analyzed, and the finite element numerical simulation is carried out to illustrate the mechanism of the failure of bank slope failure. Finally, Strength of the site in situ testing, analysis of the strength changes and the location of the slip surface of the slope, and compared with the results of finite element analysis. The research results of this paper have certain reference value for similar embankment projects in soft soil areas.