学术
摘 要:
给出分析各向异性非均质稳定随机渗流场问题的三维有限元模型；结合实际工程问题，统计分析长江荆南干堤土性参数的分布特征，通过Kolomogorov-Smirnov统计检验表明，渗透系数呈高斯分布假设可以接受。通过对长江荆南干堤随机渗流场的三维有限元统计模拟的数值分析，研究长江荆南干堤渗流场的各种随机特性，并进一步对随机模拟结果进行统计检验，验证模拟结果的合理性。在实际的分析研究中把上下游水位的随机波动引入三维有限元的随机分析模型，分析上下游水位的变异性对渗流场矢量的随机干扰和边界条件的随机性对随机渗流场分析结果变异性的影响。在此基础上进一步考虑施加诸如垂直截渗墙、下游导渗沟等抗渗措施后其作为复杂边界条件的扰动，在与场内土性参数的变异性共同影响下，对渗流场水头势分布的随机干扰特性，并与相应的确定性稳定渗流场问题的结果对比，证实随机渗流场研究的必要性、可行性及实用性，实现对长江荆南干堤的三维渗流场的较为全面的随机场模拟及特性分析，分析得到的结论通过统计检验并结合实测工程数据对照证明是可靠的，所研制的程序是适用的。[著者文摘]
文章出处:
《岩石力学与工程学报》-2007年26卷9期 -1824-1831页
分 类 号:
文献标识码:
A
文章编号:
1000-6915（2007）09-1824-08
THREE-DIMENSIONAL RANDOM SEEPAGE FIELD ANALYSIS FOR MAIN EMBANKMENT OF YANGTZE RIVER
WANG Yajun, ZHANG Wohua, CHEN Helong （Institute ofGeotechnicaIEngineering, Zhejiang University, Hangzhou, Zhejiang 310027, China）
Abstract:
Since the complicacy of practical seepage problem effected by various random factors, the three- dimensional simulation and analysis for stochastic seepage field has an important meaning in engineering applications. The three-dimensional anisotropic heterogeneous steady random seepage model and designed program are developed on the basis of finite element method. A statistical analysis of stratum soil characteristics and geological columns sampled from the main embankment of Yangtze River in southern Jingzhou zone of China is carried based on practical engineering projects. The statistical hypothesis of Gaussian probability distribution for random permeability tensors of soils to be submitted into the stochastic seepage field simulation was verified that this assumption would be accepted by the statistical testing based on Kolomogorov-Smirnov theory. Various statistical characteristics and random natures in random seepage fields of the main embankment of Yangtze River in southern Jingzhou zone of China were investigated by numerical analysis for stochastic seepage fields simulations using three-dimensional finite element method as well as the rationality of simulated stochastic results; and the developed model was also examined through statistical testing. Especially, the random variation of upstream and downstream water levels as a stochastic boundary condition was considered for the three-dimensional finite element model of practical analysis of the random seepage field simulations in order to describe disturbed effects of the boundary randomness due to variability of downstream and upstream water levels over variability of simulated results presented by vector series of the random seepage field. Furthermore, the functions of some safeguards to set up against the seepage problem, such as sheet-pile breakwater and catch-water, as the turbulence of complex boundary condition together with the effects of variability of soil permeability have been analyzed for description of influences on the hydraulic potential distributed in the random seepage field and compared with the result obtained by analyzing the corresponding steady seepage field problem. That presents the necessity, feasibility and practicability of employing stochastic studies in seepage field problems. The developed method provides a more detail and full stochastic algorithm to characterize and analyze three-dimensional random seepage field problems. The conclusion of simulated analysis is reliable in comparison with pertained stochastic checking and measured data from practical engineering.[著者文摘]
Key words:
seepage mechanics; anisotropic random seepage field; three-dimensional seepage finite elementmethod; Monte Carlo simulation; inhomogeneous permeability
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