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隧道衬砌水压力荷载及内力研究 被引量:10
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作者 何明磊 胡磊 孟祥磊 《铁道标准设计》 北大核心 2014年第2期79-83,共5页
通过轴对称解析计算和有限元数值计算隧道在不同衬砌渗透系数、不同注浆圈厚度、不同衬砌厚度条件下,衬砌背后的水压力、流量及衬砌内力,分析影响水压力的因素和水压力对衬砌内力的影响,轴对称解析计算和有限元数值计算结果显示水压力... 通过轴对称解析计算和有限元数值计算隧道在不同衬砌渗透系数、不同注浆圈厚度、不同衬砌厚度条件下,衬砌背后的水压力、流量及衬砌内力,分析影响水压力的因素和水压力对衬砌内力的影响,轴对称解析计算和有限元数值计算结果显示水压力和流量十分接近。衬砌不透水时,水压力荷载系数不折减;在控制排水的条件下,调整衬砌渗透系数、注浆半径和衬砌厚度可以改变水压力、流量和衬砌内力。设计时正算水荷载,施工时通过监测流量反算水荷载,对水荷载设计进行检验和修正。 展开更多
关键词 隧道 水压力荷载 流量 衬砌内力 解析计算 有限元分析
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Dynamic strength characteristics and failure criteria of anisotropically consolidated silt under principal stress rotation 被引量:2
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作者 SHEN Yang ZHANG Peng-ju +1 位作者 XU Guo-jian LIU Han-long 《Journal of Central South University》 SCIE EI CAS 2013年第7期2025-2033,共9页
In order to identify the critical properties and failure criteria of in-situ silt under vehicle or wave loading, anisotropically consolidated silt under undrained cyclic principal stress rotation was studied with holl... In order to identify the critical properties and failure criteria of in-situ silt under vehicle or wave loading, anisotropically consolidated silt under undrained cyclic principal stress rotation was studied with hollow cylinder dynamic tests. The results show that for the slightly anisotropically consolidated samples with consolidation ratios no larger than 1.5, the structure collapses and the deviator strain and pore pressure increase sharply to fail after collapse. For the highly anisotropically consolidated samples with consolidation ratios larger than 1.5, the strain increases steadily to high values, which shows characteristics of ductile failure. 4% is suggested to be the threshold value of deviator stain to determine the occurrence of collapse. The normalized relationship between pore pressure and deviator strain can be correlated by a power fimction for all the anisotropically consolidated samples. Based on it, for the highly anisotropically consolidated samples, the appearance of inflection point on the power function curve is suggested to sign the failure. It can be predicted through the convex pore pressure at this point, whose ratio to the ultimate pore pressure is around linear with the consolidation ratio in spite of the dynamic shear stress level. And the corresponding deviator strain is between 3% and 6%. The strain failure criterion can also be adopted, but the limited value of stain should be determined according to engineering practice. As for the slightly anisotropically consolidated samples, the turning points appear after collapse. So, the failure is suggested to be defined with the occurrence of collapse and the collapse pore pressure can be predicted with the ultimate pore pressure and consolidation ratio. 展开更多
关键词 principal stress rotation anisotropic consolidation SILT COLLAPSE failure criterion
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Wave-induced seepage and its possible contribution to the formation of pockmarks in the Huanghe(Yellow) River delta 被引量:1
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作者 王虎 刘红军 +1 位作者 张民生 王秀海 《Chinese Journal of Oceanology and Limnology》 SCIE CAS CSCD 2016年第1期200-211,共12页
Wave-induced seepage and its possible contribution to the formation of pockmarks in the Huanghe(Yellow) River delta were investigated experimentally and numerically. Laboratory experiments were carried out to explore ... Wave-induced seepage and its possible contribution to the formation of pockmarks in the Huanghe(Yellow) River delta were investigated experimentally and numerically. Laboratory experiments were carried out to explore the response of a layered silty seabed with various saturation conditions under cyclic wave loads,in which the pore pressure and seepage-related phenomena were particularly monitored. Numerical models to simulate wave-induced seepage in the seabed were presented and evaluated,then applied to the Huanghe River delta. The experimental results show that the excess pore pressure decreases more rapidly at the surface layer,while the seepage-related phenomena are more pronounced when large cyclic loads are applied and the underlying layer is less saturated. The proposed numerical models were verified by comparing with the experiments. The calculated seepage depth agreed well with the depth of the pockmarks in the Huanghe River delta. The experimental and numerical results and the existing insitu investigations indicate that the wave-induced seepage may be a direct cause of the pockmarks in the Huanghe River delta. Extreme storm waves and the dual-layered structure of hard surface layer and weak underlying layer are essential external and internal factors,respectively. Wave- or current-induced scour and transport are possible contributors to the reformation of pockmarks at a later stage. 展开更多
关键词 wave loads SEEPAGE excess pore pressure POCKMARKS Huanghe (Yellow) River delta
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Coefficient of consolidation by end of arc method
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作者 Mohsen Abbaspout Reza Porhoseini +1 位作者 Kazem Barkhordari Ahmad Ghorbani 《Journal of Central South University》 SCIE EI CAS CSCD 2015年第1期332-337,共6页
One of the most important issues in geotechnical engineering is excess pore pressure caused by clay soil loading and consolidation. Regarding uncertainties and complexities, this issue has long been the subject of att... One of the most important issues in geotechnical engineering is excess pore pressure caused by clay soil loading and consolidation. Regarding uncertainties and complexities, this issue has long been the subject of attention of many researchers. In this work, a one-dimensional consolidation apparatus was equipped in a way that pore water pressure and settlement could be continuously read and recorded during consolidation process under static loading. The end of primary consolidation was obtained using water pressure changes helping to present a new method for determining the end of primary consolidation and consolidation coefficient. This method was then compared with two classical theory methods of lg t and t. Using Terzaghi's theory, the way of pore pressure dissipation for lg t, t and the new method was found and compared with experimental results. It is concluded that the new method has better results. 展开更多
关键词 one-dimensional consolidation of soil excess pore pressure end primary consolidation consolidation coefficient static loading
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