Site response of heterogeneous natural deposits to harmonic excitation applied to more than 100 case histories     

Reza Jamshidi Chenari  Shirin Aminzadeh Bostani Taleshani 《地震工程与工程振动(英文版)》2016,15(2):341-356

Variation of shear-wave propagation velocity (SWV) with depth was studied by analyzing more than one hundred actual SWV profiles. Linear, power, and hyperbolic variation schemes were investigated to find the most representative form for naturally occurred alluvial deposits. It was found that hyperbolic (asymptotic) variation dominates the majority of cases and it can be reliably implemented in analytical or analytical-numerical procedures. Site response analyses for a one-layer heterogeneous stratum were conducted to find an equivalent homogeneous alternative which simplifies the analysis procedure but does not compromise the accuracy of the resonance and amplification responses. Harmonic average, arithmetic average and mid-value equivalents are chosen from the literature for investigation. Furthermore, full and partial depth averaging schemes were evaluated and compared in order to verify the validity of current practices which rely upon averaging shallow depths, viz., the first 30 m of the strata. Engineering bedrock concept was discussed and the results were compared.  相似文献   

地质钻探过程中上返岩屑的组分研究          下载免费PDF全文

杜特利亚.Н.А  希林.Л.Н  费多连科.Э.А 《探矿工程》2011,38(12):7-9

采用全俄石油钻进研究院提出的岩屑组分研究方法,分析了乌克兰顿巴斯矿区地质钻探过程中上返岩屑的组分研究结果,可为钻探冲洗液的选择提供理论依据。  相似文献   

Solitary wave propagation influenced by submerged breakwater     

王锦  左其华  王登婷 《中国海洋工程》2013,27(5):593-604

The form of Boussinesq equation derived by Nwogu （1993） using velocity at an arbitrary distance and surface elevation as variables is used to simulate wave surface elevation changes. In the numerical experiment, water depth was divided into five layers with six layer interfaces to simulate velocity at each layer interface. Besides, a physical experiment was carried out to validate numerical model and study solitary wave propagation.“Water column collapsing”method （WCCM） was used to generate solitary wave. A series of wave gauges around an impervious breakwater were set-up in the flume to measure the solitary wave shoaling, run-up, and breaking processes. The results show that the measured data and simulated data are in good agreement. Moreover, simulated and measured surface elevations were analyzed by the wavelet transform method. It shows that different wave frequencies stratified in the wavelet amplitude spectrum. Finally, horizontal and vertical velocities of each layer interface were analyzed in the process of solitary wave propagation through submerged breakwater.  相似文献