摘要
波浪在传播的过程中,产生的附加应力会使海床土体强度沿深度产生非均匀性变化。利用Biot固结理论,分析了波浪作用下海床土体的体积应变随深度分布情况,在此过程中考虑了土体的渗透系数、剪切模量、海床厚度、波浪周期和水深对海床土体的体积应变的影响。分析结果表明:对于无限厚度的粉质海床,波浪作用下在0.12个波长深度处有强度硬层存在;当沉积物的厚度小于0.5个波长时,波浪引起的强度硬层位于海床表面,当沉积物的厚度大于0.5个波长时,波浪引起的强度硬层所处的深度随着海床厚度的增加而增加;波浪引起的土体强度随着土体的剪切模量、水深、波浪周期及其渗透系数的影响在深度上呈现明显的非均匀变化。
When waves propagate over a porous sea bed, the strength of soils in seabed will vary non-uniformly with depth. On the basis of Biot＇s consolidation theory, the distributions of the volume strain of soils along the depth was discussed considering of influences of permeability, shear modulus, wave period, water depth and soil thickness. It was shown that under the action of waves, there＇s a hard layer at the depth of 0.12 wavelength in silty seabed of infinite thickness; the wave-induced hard layer was at the surface of seabed when the thickness of sediment was less than half a wavelength; when the thickness was larger than half a wavelength, the wave-induced hard layer was at a depth increasing as seabed thickness increases; the wave-induced strength of soils was apparently non-uniform under the influence of shear modulus and permeability of soil, wave period and water depth.
出处
《岩土工程学报》
EI
CAS
CSCD
北大核心
2008年第6期924-929,共6页
Chinese Journal of Geotechnical Engineering
基金
国家自然科学基金资助项目(40606020)
山东省自然科学基金资助项目(Y2007E07)
