海底原位土体孔压监测与评价技术

In-situ monitoring and assessment techniques for pore pressure of seabed soil

研制出了海底土体原位孔监测装置,由包含锥尖阻力传感器、侧摩阻力传感器、孔隙水压力传感器的测杆和相应的自动化数据采集、处理、评价系统组成,可用来监测波浪在土体内不同深度处产生的超孔隙水压力(可连续观测一个月),并利用建立的分析评价系统查询到采集数据中的任意探测深度、任一时间段内的孔压曲线以及波浪变化曲线,也可以查询到同一时间探测深度上的孔压曲线,并判断波浪强度对孔压大小的影响以及波浪对孔压的影响深度,同时,系统将会根据有效应力原理以及物理模型试验得出的经验公式对土体液化可能性进行判别.

A system for in-situ monitoring of pore pressure of seabed soil and assessment of the stability of seabed soil was developed. It includes two parts： the measurement rod composed of cone resistance transducers, side friction transducers, pore pressure transducers and the unit for data automatic acquisition, process and analysis. It can be used to monitor excess pore pressure in different levels of depth in the soil（ it can monitor continually one month）. This system can show excess pore pressure curves and wave curves during any time length in one month at any test depth and also can show excess pore pressure curves in scope of test depth at the same time. From these curves, effect of wave intensity on excess pore pressure and effect of wave on answering depth of excess pore pressure can easily obtained. At the same time, the system will show liquefaction potential analysis of seabed soil by the relation between excess pore pressure and effective stress from theory of effective stress and the model test.