航道整治岸坡坍岸区的形成条件及机制

Formation conditions and mechanism of slope collapse area in waterway regulation

护岸工程作为航道整治工程的重要部分,岸坡的稳定性关系到工程的整体质量、航道的通航安全,甚至沿岸居民的生命财产安全,因此岸坡的稳定性至关重要。为了对涉水岸坡的稳定性进行有效分析,前期需查明岸坡的物质组成、滑动面位置、形成条件及形成机制。以某航道整治岸坡坍岸区为研究对象,对坍岸区后缘、中部及侧壁外侧开展了地质调查和地质勘探,初步查明了岸坡坍岸区内外的物质组成。通过标准贯入击数、含水率和直剪指标等对比分析坍岸区域内外土层的物理力学性质差异,分析了坍岸的形成条件和形成机制。初步判定滑移面所在的位置,并提出了坍岸区治理的方案。

The bank protection project is an important part of the waterway regulation project.The stability of the bank slope is related to the overall quality of the project,the navigation safety of the waterway,and even the safety of life and property of the coastal residents.Therefore,the stability of the bank slope is very important.In order to effectively analyze the stability of the wading bank slope,it is necessary to identify the material composition of the bank slope,the position of the sliding surface,and the formation conditions and the formation mechanism in the early stage.Taking a waterway regulation bank slope collapse area as the research object,the geological survey and geological exploration of the rear edge,middle part and outer side wall of the bank collapse area are carried out,and the material composition inside and outside the bank slope collapse area is preliminarily identified.The differences in the physical and mechanical properties of the soil layers inside and outside the bank collapse area are compared and analyzed through the standard penetration number,water content and direct shear index,and the formation conditions and formation mechanism of bank collapse are analyzed.The position of the slip plane is preliminarily determined,and the proposal for the treatment of the bank collapse area is put forward.