Gassy sediments are frequently encountered in engineering geology and geotechnical engineering. Gas bubbles contained in these sediments significantly change the engineering properties, and further influence the consolidation and creep process. The long term behaviour of gassy sediment is drastically different from that of saturated and unsaturated soils. This study presents an analytical solution for exploring such behaviour within layered viscoelastic gassy sediments under different type of load. An Analytical layer element method together with a Laplace-Hankel transform are employed to solve the governing equations, and the viscoelastic solution is then captured with the aid of the elastic-viscoelastic correspondence principle. Comparisons of the present solution with published semianalytical solutions and experimental results, for a single and double layered soils, are provided. Extensive parametric analyses were carried out to explore the effects of the soil skeleton model, fractional order, type of load, saturation degree and stratification characteristics on consolidation and creep processes. In the present model, the permeability is saturation degree- and porosity-dependent and the modulus of elasticity is time-dependent, which can simulate the long term behaviours of gassy sediments reasonably.

在工程地质和岩土工程中经常遇到含气沉积物。这些沉积物中含有的气泡显着改变了工程性质，并进一步影响了固结和蠕变过程。含气沉积物的长期行为与饱和和非饱和土壤的长期行为截然不同。本研究提出了一种分析解决方案，用于探索不同类型载荷下层状粘弹性气沉积物中的这种行为。采用解析层元法和拉普拉斯-汉克尔变换求解控制方程，然后借助弹-粘弹性对应原理获得粘弹性解。本解决方案与已发表的半分析解决方案和实验结果的比较，对于单层和双层土壤，提供。进行了广泛的参数分析，以探讨土壤骨架模型、分数阶次、载荷类型、饱和度和分层特征对固结和蠕变过程的影响。在本模型中，渗透率与饱和度和孔隙度有关，弹性模量与时间有关，可以合理模拟含气沉积物的长期行为。