波浪荷载作用下海床的液化及参数分析
|
摘要
为研究波浪荷载作用下海床的液化和其主要影响因素,基于线性水波理论和Biot波动理论,得到波浪荷载作用下海床土体中孔隙水压力和有效应力的解析表达式。以海床的液化深度作为主要评价指标,选择合适的液化判别方法,通过算例分析得出海床在不同水波和土体物理力学性质参数时的瞬时液化深度。结果表明:水波和海床的物理力学性质对海床液化深度影响较大,如水波的周期、水深、海床土体的强度、渗透率、泊松比、流体的压缩性等,其中波浪周期和海床的剪切模量、渗透率对海床的液化深度影响最大,其他参数在一定变化范围内对海床的瞬时液化影响较为明显。根据数值分析结果,提出了海床液化的防治措施。
In order to investigate the liquefaction of seabed and its main influential factors, the explicit expressions of excess pore pressure and effective stresses of seabed soil under wave loadings are obtained using the theory of linear water wave and Biot's dynamic equilibrium equations. By taking the liquefaction depth of seabed as the main evaluation index and choosing a reasonable liquefaction discriminant method, the momentary liquefaction depth of seabed under different physical and mechanical parameters of water wave and seabed is calculated through numerical examples. The results show that the liquefaction depth of seabed is significantly influenced by the physical and mechanical properties of water wave and seabed, such as water wave period, water depth, soil strength, permeability, Poisson's ratio, and fluid compressibility. The wave period, shear modulus, and permeability coefficient of seabed have the greatest influence on the liquefaction depth of seabed, while other parameters have certain effects on the momentary liquefaction depth of seabed. Based on the numerical results, the prevention and control measures of seabed liquefaction are suggested.
In order to investigate the liquefaction of seabed and its main influential factors, the explicit expressions of excess pore pressure and effective stresses of seabed soil under wave loadings are obtained using the theory of linear water wave and Biot's dynamic equilibrium equations. By taking the liquefaction depth of seabed as the main evaluation index and choosing a reasonable liquefaction discriminant method, the momentary liquefaction depth of seabed under different physical and mechanical parameters of water wave and seabed is calculated through numerical examples. The results show that the liquefaction depth of seabed is significantly influenced by the physical and mechanical properties of water wave and seabed, such as water wave period, water depth, soil strength, permeability, Poisson's ratio, and fluid compressibility. The wave period, shear modulus, and permeability coefficient of seabed have the greatest influence on the liquefaction depth of seabed, while other parameters have certain effects on the momentary liquefaction depth of seabed. Based on the numerical results, the prevention and control measures of seabed liquefaction are suggested.
引文
[1] HENKEL D J. The role of waves in causing submarine landslides[J]. Geotechnique, 1970, 20(1): 75-80.
[2] ZEN K, YAMAZAKI H. Mechanism of wave-induced liquefaction and densification in seabed[J]. Soils and foundations, 1990, 30(4): 90-104.
[3] JENG D S. Soil response in cross-anisotropic seabed due to standing waves[J]. Journal of geotechnical and geoenvironmental engineering, 1997, 123(1): 9-19.
[4] NATARAJA M S, GILL H S. Ocean wave-induced liquefaction analysis[J]. Journal of geotechnical engineering, 1983, 109(4): 573-590.
[5] BIOT M A. Theory of elastic waves in a fluid-saturated porous solid. I. Low-frequency range[J]. Journal of acoustic society of American, 1956, 28(2): 168-178.
[6] 刘倩倩.波浪作用下海床的动力响应研究[D].杭州:浙江工业大学,2018.
[7] OKUSA S. Wave-induced stresses in unsaturated submarine sediments[J]. Geotechnique, 1985, 35(4): 517-532.
[8] TSAI C P. Wave-induced liquefaction potential in a porous seabed in front of a breakwater[J]. Ocean engineering, 1995, 22(1): 1-18.
[9] 王栋,栾茂田,郭莹.波浪作用下海床动力反应有限元数值模拟与液化分析[J].大连理工大学学报,2001,41(2):216-222.
[10] LIN P, NOGAMI T, CHEONG H F, et al. Soil liquefaction and sediment re-suspension on seabed due to wave-current interaction[C]//Proceedings of the 1st Asian and Pacific Coastal Engineering. Dalian: China Coastal Engineering Society, 2001: 776-786.
[11] GAO Y F, SHEN Y, ZHANG J,et al. Analysis of wave-induced liquefaction in seabed deposits of silt[J]. China ocean engineering, 2011, 25(1): 31-44.
[12] YE J H. 3D liquefaction criteria for seabed considering the cohesion and friction of soil[J]. Applied ocean research, 2012, 37(4): 111-119.
[13] 韩涛,张庆河,张金凤,等.波浪作用下砂质海床最大液化深度[J].中国港湾建设,2006,142(2):27-28.
[14] 陈俊东,张驰,隋倜倜,等.波浪加速度不对称性对海床液化的影响[J].水利水电科技进展,2016,36(4):20-24.
[15] 朱小可,胡敏云,朱烨.循环荷载作用下近海粉土工作性状的试验研究[J].浙江工业大学学报,2008,36(2):214-220.
[16] 孟凡丽,吕筱,来淑娜.循环荷载下杭州粉砂土动孔压模型研究[J].浙江工业大学学报,2016,44(1):67-71.
[17] 孟凡丽,黄聪,郑棋.细粒对杭州饱和粉土动力特性的影响[J].浙江工业大学学报,2016,44(3):300-304.
[2] ZEN K, YAMAZAKI H. Mechanism of wave-induced liquefaction and densification in seabed[J]. Soils and foundations, 1990, 30(4): 90-104.
[3] JENG D S. Soil response in cross-anisotropic seabed due to standing waves[J]. Journal of geotechnical and geoenvironmental engineering, 1997, 123(1): 9-19.
[4] NATARAJA M S, GILL H S. Ocean wave-induced liquefaction analysis[J]. Journal of geotechnical engineering, 1983, 109(4): 573-590.
[5] BIOT M A. Theory of elastic waves in a fluid-saturated porous solid. I. Low-frequency range[J]. Journal of acoustic society of American, 1956, 28(2): 168-178.
[6] 刘倩倩.波浪作用下海床的动力响应研究[D].杭州:浙江工业大学,2018.
[7] OKUSA S. Wave-induced stresses in unsaturated submarine sediments[J]. Geotechnique, 1985, 35(4): 517-532.
[8] TSAI C P. Wave-induced liquefaction potential in a porous seabed in front of a breakwater[J]. Ocean engineering, 1995, 22(1): 1-18.
[9] 王栋,栾茂田,郭莹.波浪作用下海床动力反应有限元数值模拟与液化分析[J].大连理工大学学报,2001,41(2):216-222.
[10] LIN P, NOGAMI T, CHEONG H F, et al. Soil liquefaction and sediment re-suspension on seabed due to wave-current interaction[C]//Proceedings of the 1st Asian and Pacific Coastal Engineering. Dalian: China Coastal Engineering Society, 2001: 776-786.
[11] GAO Y F, SHEN Y, ZHANG J,et al. Analysis of wave-induced liquefaction in seabed deposits of silt[J]. China ocean engineering, 2011, 25(1): 31-44.
[12] YE J H. 3D liquefaction criteria for seabed considering the cohesion and friction of soil[J]. Applied ocean research, 2012, 37(4): 111-119.
[13] 韩涛,张庆河,张金凤,等.波浪作用下砂质海床最大液化深度[J].中国港湾建设,2006,142(2):27-28.
[14] 陈俊东,张驰,隋倜倜,等.波浪加速度不对称性对海床液化的影响[J].水利水电科技进展,2016,36(4):20-24.
[15] 朱小可,胡敏云,朱烨.循环荷载作用下近海粉土工作性状的试验研究[J].浙江工业大学学报,2008,36(2):214-220.
[16] 孟凡丽,吕筱,来淑娜.循环荷载下杭州粉砂土动孔压模型研究[J].浙江工业大学学报,2016,44(1):67-71.
[17] 孟凡丽,黄聪,郑棋.细粒对杭州饱和粉土动力特性的影响[J].浙江工业大学学报,2016,44(3):300-304.