3D scattering of obliquely incident plane SV waves by an alluvial valley embedded in a fluid-saturated,poroelastic layered half-space     

Zhenning Ba  Jianwen Liang  Xiongyi Mei 《地震学报(英文版)》2013,(2):107-116

The indirect boundary element method is used to study the 3D dynamic response of an infinitely long alluvial valley embedded in a saturated layered half-space for obli- quely incident SV waves. A wave-number transform is first applied along the valley＇s axis to reduce a 3D problem to a 2D plane strain problem. The problem is then solved in the section perpendicular to the axis of the valley. Finally, the 3D dynamic responses of the valley are obtained by an inverse wave-number transform. The validity of the method is con- firmed by comparison with relevant results. The differences between the responses around the valley embedded in dry and in saturated poroelastic medium are studied, and the effects of drainage conditions, porosity, soil layer stiffness, and soil layer thickness on the dynamic response are dis- cussed in detail resulting in some conclusions.  相似文献   

Variation of specific yield with depth in an alluvial aquifer of the Platte River valley, USA     

Jinxi SONG Xunhong CHEN 《国际泥沙研究》2010,25(2):185-193

Estimation of specific yield (Sy) of an aquifer is of great importance in water resource management. In this study, an experimental drainage method was developed to determine specific yield of an alluvial aquifer of the Platte River valley, Nebraska, USA. Sets of sediment cores with continuous interval depth were collected to plastic tubes using the direct push technique and then taken to the laboratory. During the Sy experiment, those sediment cores were re-saturated by placing them vertically in a large water tank. Sy was determined by the water drained from the sediments by force of gravity in a bracket. Our results show that the values of Sy varied largely with depth at each site and the variability for Sy with interval depth between the test sites is also observed. This spatial heterogeneity in Sy might result from the variation of grain size, grain shape, sorting and compaction of sediments in different cores with interval depth. The Sy for all sediment cores ranged from 0.01 to 0.18 and the mean value was 0.08±0.04. Our drainage method can functionally preserve the sedimentary structures in their original state and it is easier to experiment at a lower expense.  相似文献   

利用电法勘查浅层冲积含水层：土耳其实例     

Go＂khan  Go＂ktu＂rkler  C    ag  layan  Balkaya  赵玉军 《水文地质工程地质技术方法动态》2009,(2)

近地表地球物理勘查技术常用于解决各种地质、工程和环境问题。在本项研究中,通过开展电法测量勘查冲积含水层。研究区位于土耳其伊兹密尔市南部Cubukludag地堑的西南部区域。地球物理勘查方法包括电阻率成像和自然电位（SP）法。通过温纳-施兰贝尔（Wenner—Schlumberger）电极排列方式,沿研究区北部的8个剖面采集电阻率数据,并利用层析成像反演技术进行数据处理。利用梯度法沿16个剖面采集自然电位数据。通过对连续梯度值的求和,计算每个剖面的总自然电位值,随后绘制出总自然电位实测图。通过开展电阻率成像和自然电位勘查清楚地揭示研究区北部地下水饱和带,从而得出有关地下流体运动的有用信息。  相似文献   

饱水状态对岩石冲击倾向性影响的研究     

肖为国  ;贾晓垒  ;崔继生  ;姜振泉 《山东地质》2009,(9):26-28

取菏泽赵楼煤矿岩样进行了饱水前后冲击倾向性指标的对比试验,研究发现饱水状态对岩样弹性能量指数影响明显,动态破坏时间和冲击能量指数亦有影响。对于不同水稳性特征的岩石,饱水前后的冲击倾向性存在明显差异。  相似文献   

三种浅地震方法在冲积含水层研究中的应用和比较     

Ayers  JF 何雪洲 《水文地质技术方法》1990,(21):91-99

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天山乌鲁木齐河源区倒石堆浅论     

朱诚  崔之久 《山地学报》1988,(4)

倒石堆是一种重要的山地地貌类型。作者于1985—1987年对天山乌鲁木齐河源区倒石堆的成因、类型、组构进行了实地考察,并重复定位观察了倒石堆岩屑运动速度,对野外所获资料及数据经分析处理后,得出若干结果。  相似文献   

山东黄河冲积平原区土壤地球化学特征   总被引：2，自引：1，他引：1  

庞绪贵  李肖鹏  王炳华  曾宪东  陈磊 《山东国土资源》2008,24(11)

山东黄河冲积平原区土壤地球化学调查是按每1km^2采集1件表层土壤样品，4km^2组合成1件分析样品，每4km^2采集1件深层土壤样品，16km^2组合成1件分析样品，测试Ag，As，Au，B，Ba，Be，Bi，Br，C，Cd，Ce，CI，Co，Cr，Cu，F等54项指标。在统计这些指标的表层、深层土壤地球化学特征参数的基础上，对其与全国同类参数的差异进行了分析，对比区内表层、深层土壤元素地球化学含量值的变化，认为大部分指标在表层土壤中的含量继承了土壤母质的成分特征，后期人类活动对其影响较小，但Corg，N，Se，S，P，Br，Hg等指标在表层土壤中已明显富集，表明表生作用和人类活动等因素已对这些指标的分布分配产生明显影响。  相似文献   

浅谈盐碱地“挖塘筑台”土地开发利用     

吴书泉  李方建 《山东国土资源》2007,23(8):38-38,44

山东省北部沿海地区,特别是在黄河冲积平原区域,土质多为潮土,土壤盐碱化程度严重。地貌多为洼地、斜平地、高岗地、河滩地等多地形相间的微地貌。海拔高度一般在4.0~7.0 m之间。受海水浸透的影响,水质差,地下水位高,一般地下水埋深在地表下1.5 m左右,大部分地区无浅层地表淡水  相似文献   

陆相层序地层学的展望     

Shan.  KW 覃建雄 《地质科学译丛》1995,12(1):20-26

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结合冲积盆地的山区径流评估补给分布     

葛秀珍 《水文地质工程地质技术方法动态》2002,(2):13-13

  相似文献