厦门沪救码头附近海底滑坡特征及机理

根据多种勘察手段的识别,查明厦门沪救码头附近海底地形等值线明显扭曲;码头南侧外块石与淤泥互为翻转;滑体后方淤泥可见到蜂窝状孔隙;北码头一带不连续分布有新近沉积的灰黄色淤泥且沿海岸;另外地震映像也出现绕射波相对严重等现象。本文结合地形、地层、海洋水动力条件等因素,对滑动机理进行综合分析;在不考虑海浪、地震作用下,对水下坡体采用极限平衡理论方法、后壁岸坡选择圆弧条分法进行不同的稳定性评价。研究得出:该海底滑坡形成是自然地质、人为活动和重力、海洋动力共同作用以及地层因素的综合结果。

DESTRUCTION CHARACTERISTIC AND MECHANISM OF A SEABED LANDSLIDE AT A RESCUE WHARF IN XIAMEN

This paper is based on the configuration characteristics and topographical changes of the seabed landslide and the results of geophysical exploration and engineering geological prospecting. The structural deterioration characteristics are recognised. A comprehensive analysis of the sliding mechanism is carried out using the following factors: topography, stratum, hydrodynamic conditions and the landslide structure. For different landslide factors, different stability evaluation methods are adopted n. For the submarine landslide, the limiting equilibrium method is adopted; for the posterior landslide, the arc slice method is used. The parameters of the undisturbed and remoulded soft soil samples taken from the submarine landslide are used in calculation. It is found that this submarine landslide was caused by the integrated effect of natural geology, human activity, gravitation and ocean dynamics. The stability factor is far below 1. The findings provide a qualitative and quantitative scientific basis for the landslide remediation.