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坝坡外水体对土坝坝坡稳定性的影响分析 被引量:1
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作者 施震余 沈长松 梁伦法 《人民长江》 北大核心 2013年第7期47-50,63,共5页
针对某土工膜斜墙坝在运行期由于泄洪、暴雨、坝体排水不畅、土工膜缺陷渗漏等原因导致的浸润线上升、下游水位上涨等情况,分析了坝坡外水体对坝坡稳定的影响。计算分别采用简化Bishop法和有限单元应力法,其中简化Bishop法通过静水压力... 针对某土工膜斜墙坝在运行期由于泄洪、暴雨、坝体排水不畅、土工膜缺陷渗漏等原因导致的浸润线上升、下游水位上涨等情况,分析了坝坡外水体对坝坡稳定的影响。计算分别采用简化Bishop法和有限单元应力法,其中简化Bishop法通过静水压力法和置换容重法对坝坡外水体进行考虑。分析结果表明:由于浸润线上升和下游水位上升两者的共同作用,最小安全系数会随着出逸点的升高而减小,但考虑到上下游水位差减小,最小安全系数减小的速率会越来越慢。坝坡外水体对坝坡稳定的影响有利有弊,应合理利用。 展开更多
关键词 坡外水体 坝坡稳定 置换容重 静水压力法
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Three-dimensional consolidation deformation analysis of porous layered soft soils considering asymmetric effects 被引量:1
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作者 张治国 黄茂松 王卫东 《Journal of Central South University》 SCIE EI CAS 2014年第9期3639-3647,共9页
Long-term settlements for underground structures, such as tunnels and pipelines, are generally observed after the completion of construction in soft clay. The soil consolidation characteristic has great influences on ... Long-term settlements for underground structures, such as tunnels and pipelines, are generally observed after the completion of construction in soft clay. The soil consolidation characteristic has great influences on the long-term deformation for underground structures. A three-dimensional consolidation analysis method under the asymmetric loads is developed for porous layered soil based on Biot's classical theory. Time-displacement effects can be fully considered in this work and the analytical solutions are obtained by the state space approach in the Cartesian coordinate. The Laplace and double Fourier integral transform are applied to the state variables in order to reduce the partial differential equations into algebraic differential equations and easily obtain the state space solution. Starting from the governing equations of saturated porous soil, the basic relationship of state space variables is established between the ground surface and the arbitrary depth in the integral transform domain. Based on the continuity conditions and boundary conditions of the multi-layered pore soil model, the multi-layered pore half-space solutions are obtained by means of the transfer matrix method and the inverse integral transforms. The accuracy of proposed method is demonstrated with existing classical solutions. The results indicate that the porous homogenous soils as well as the porous non-homogenous layered soils can be considered in this proposed method. When the consolidation time factor is 0.01, the value of immediate consolidation settlement coefficient calculated by the weighted homogenous solution is 27.4% bigger than the one calculated by the non-homogeneity solution. When the consolidation time factor is 0.05, the value of excess pore water pressure for the weighted homogenous solution is 27.2% bigger than the one for the non-homogeneity solution. It is shown that the material non-homogeneity has a great influence on the long-term settlements and the dissipation process of excess pore water pressure. 展开更多
关键词 three-dimensional consolidation deformation porous layered soils asymmetric loads long-term deformation prediction transfer matrix method
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Consolidation and dynamics of 3D unsaturated porous seabed under rigid caisson breakwater loaded by hydrostatic pressure and wave 被引量:4
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作者 YE JianHong JENG DongSheng CHAN A H C 《Science China(Technological Sciences)》 SCIE EI CAS 2012年第8期2362-2376,共15页
In this study,based on the dynamic Biot's theory "u-p" approximation,a 3D finite element method(FEM) numerical soil model is developed,in which the Generalized Newmark-β method is adopted to determine the time i... In this study,based on the dynamic Biot's theory "u-p" approximation,a 3D finite element method(FEM) numerical soil model is developed,in which the Generalized Newmark-β method is adopted to determine the time integration.The developed 3D FEM soil model is a part of the coupled model PORO-WSSI 3D for 3D wave-seabed-marine structures interaction problem,and is validated by the analytical solution proposed by Wang(2000) for a laterally infinite seabed loaded by a uniform force.By adopting the developed 3D soil model,the consolidation of seabed under a caisson breakwater and hydrostatic pressure is investigated.The numerical results show that the caisson breakwater built on seabed has very significant effect on the stresses/displacements fields in the seabed foundation after the transient deformation and primary consolidation are completed.The parametric study indicates that the Young's modulus E of seabed is the most important parameter to affect the settlement of breakwater,and the displacement fields in seabed foundation.Taking the consolidation status as the initial condition,the interaction between ocean wave,caisson breakwater and seabed foundation is briefly investigated.The 3D ocean wave is determined by solving the Navier-Stokes equations with finite volume method(FVM).The numerical results indicate that there is intensive interaction between oceean wave, caisson breakwater and seabed foundation; and the breakwater indeed can effectively block the wave energy propagating to the coastline. 展开更多
关键词 CONSOLIDATION wave-seabed-breakwater interaction unsaturated seabed BREAKWATER Biot's theory Navier-Stokes equation
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