曹妃甸甸头斜坡液化深度预测及稳定性的模拟评价
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摘要
曹妃甸甸头水下边坡主要由粉细砂组成,边坡于近岸较陡,在极端海况下水下边坡底床存在液化可能,甚至影响岸坡稳定,威胁工程安全。本文采用物理模型和数学模型计算互为补充,对曹妃甸甸头海底可能形成的波致液化情况和液化后岸坡稳定问题展开研究工作。
论文首先对波致底床响应的国内外研究历程进行回顾；其次根据已有调查资料总结给出曹妃甸甸头的基本海洋环境概况；然后利用动三轴试验和波浪水漕试验分别对曹妃甸甸头砂样进行抗液化特性和砂样底床液化响应进行研究；进而采用有限元计算软件对不同波况下甸头斜坡液化发展进行模拟预测。最后,利用斜坡稳定性分析软件对液化前后斜坡整体和局部稳定性进行评价。
论文研究结果表明,日常海况不会对海床产生液化影响,但在极端海况下底床会产生液化,且伴随波浪增大,海床液化深度和范围会大幅增加。极端海况发生时,甸头斜坡整体处于稳定状态,但稳定性较原斜坡有明显削减。因液化作用产生的滑动堆积体,其形成的剩余下滑力可能对海岸工程安全性造成威胁,需要防范和注意。
The sediment around Caofedian Cape sea area is mainly composed by silt sand and fine sand. Because the underwater slope is steep, the seabed liquefaction may be induced, when the extreme wave condition occurs. Through physical tests and numerical simulations, this paper mainly studys on wave-induced seabed liquefaction, and how the liquefaction influences the slope stabilities.
Firstly, a brief literature review of wave induced liquefaction is studied. Secondly, based on the surveyed documents, the ocean enviorment conditions of Caofeidian Cape are concluded. Then by using dynamic triaxial test and flume test, the sediment anti-liquefaction abilities and the sandbed responds to wave action are studied respectively. Through numerical simulation, based on finite element software, a forecast of how the liquefaction developed under different wave condition is studied. Finally, by using Geo-slope/W and Sweden slice method, the whole stability and the stability of liquefaction sediment are calculated and evaluated, and some control measures are suggested.
As the results show, only when the wave height is large enough, the liquefaction of seabed may occur and, with the increase of the wave height, the depth of liquefaction increases sharply. Under the storm surge condition, the whole slope stability decrease sharply compare to the original, however, the stabilizing force is still larger than the slide force. Through the slice calculation of the liquified sediment, an obvious accumulated stress may threaten the safety of coastal structures which are built on the underwater slope.
论文首先对波致底床响应的国内外研究历程进行回顾；其次根据已有调查资料总结给出曹妃甸甸头的基本海洋环境概况；然后利用动三轴试验和波浪水漕试验分别对曹妃甸甸头砂样进行抗液化特性和砂样底床液化响应进行研究；进而采用有限元计算软件对不同波况下甸头斜坡液化发展进行模拟预测。最后,利用斜坡稳定性分析软件对液化前后斜坡整体和局部稳定性进行评价。
论文研究结果表明,日常海况不会对海床产生液化影响,但在极端海况下底床会产生液化,且伴随波浪增大,海床液化深度和范围会大幅增加。极端海况发生时,甸头斜坡整体处于稳定状态,但稳定性较原斜坡有明显削减。因液化作用产生的滑动堆积体,其形成的剩余下滑力可能对海岸工程安全性造成威胁,需要防范和注意。
The sediment around Caofedian Cape sea area is mainly composed by silt sand and fine sand. Because the underwater slope is steep, the seabed liquefaction may be induced, when the extreme wave condition occurs. Through physical tests and numerical simulations, this paper mainly studys on wave-induced seabed liquefaction, and how the liquefaction influences the slope stabilities.
Firstly, a brief literature review of wave induced liquefaction is studied. Secondly, based on the surveyed documents, the ocean enviorment conditions of Caofeidian Cape are concluded. Then by using dynamic triaxial test and flume test, the sediment anti-liquefaction abilities and the sandbed responds to wave action are studied respectively. Through numerical simulation, based on finite element software, a forecast of how the liquefaction developed under different wave condition is studied. Finally, by using Geo-slope/W and Sweden slice method, the whole stability and the stability of liquefaction sediment are calculated and evaluated, and some control measures are suggested.
As the results show, only when the wave height is large enough, the liquefaction of seabed may occur and, with the increase of the wave height, the depth of liquefaction increases sharply. Under the storm surge condition, the whole slope stability decrease sharply compare to the original, however, the stabilizing force is still larger than the slide force. Through the slice calculation of the liquified sediment, an obvious accumulated stress may threaten the safety of coastal structures which are built on the underwater slope.
引文
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