Detrital zircon provenance analysis in the Zagros Orogen,SW Iran: implications for the amalgamation history of the Neo-Tethys

International Journal of Earth Sciences - The Zagros Orogen developed as a result of Arabia–Eurasia collision. New in situ detrital zircon U–Pb and Hf isotopic analyses from a Cenozoic...     

海上平台桶形基础模型压力压贯与负压沉贯试验研究

介绍了海上平台桶形基础模型（模型桶）压力压贯和负压沉贯的试验概况,对比分析了两者贯入力的巨大差异和产生的原因,给出了模型桶压力压贯中贯入深度与压力的关系,负压没贯负压与贯入深度,抽吸泵流量,基土渗流量,桶内土塞隆起之间的关系,试验结果表明,负压沉贯可以大大降低以砂质粉土为基土的土抗力,为在胜利油田类似基土海域海上平台应用桶形基础提供了试验依据,为海上现场导管架桶形基础平台的安装就位施工和控制提供了     

呼和浩特市降水化学特征分析

对2006年呼和浩特市降水离子监测资料进行分析,结果表明:降水呈碱性,季节分布明显,夏季降水集中且pH值为全年最低,冬季降水量少,pH值较高;SO42-离子为主要致酸离子,阳离子中Ca2+,Mg2+离子的浓度很高;降水中主要成分之间相关性显著,Ca2+的中和作用较强;降水气团的后向轨迹分析表明蒙古国的沙漠地区是呼和浩特冬春季碱性降水的主要来源,夏季较低的pH值降水则部分源于我国的华中、华北地区的酸性污染物中长距离输送。     

贵州西北部基性侵入岩锆石U-Pb年代学、岩石地球化学特征 及其与铅锌成矿关系初探

贵州西北部发育多处基性侵入岩,总体规模较小(约0.25 Km2),多沿深大断裂侵位,出露于铅锌矿点外围,本文对猫猫厂、凉山两处矿点附近的儿马冲和白岩庆两地小型基性侵入岩进行了重点研究。侵入岩主要岩性为细粒辉长岩,造岩矿物主要为拉长石、普通辉石。SiO2范围为49.60-51.09 wt%,MgO从3.88-4.27 wt %,TiO2为3.69-3.85 wt %。LA-ICP-MS锆石U-Pb定年结果为268.3±7.4 Ma,显示岩浆侵位于二叠纪。基性侵入岩的微量元素蛛网图呈OIB型特征,富集大离子亲石元素（LILE）、轻稀土元素（LREE）,亏损重稀土元素（HFEE）,相对亏损高场强元素（Nb,Ta）,有Sr、Y亏损,Pb富集。(87Sr/86Sr)i范围0.706749～0.707069,(143Nd/144Nd)i范围0.512313～0.512363,εNd(t)范围0.2～1.2;源区熔融深度处于石榴石橄榄岩相深度,可能经历了1-3 %的部分熔融,处于亏损石榴石二辉橄榄岩相向原始石榴石二辉橄榄岩相的过渡区。成岩过程中发生了单斜辉石、斜长石等矿物分离结晶,受到了有限的地壳混染作用,未经历明显的AFC过程。地壳物质在地幔源区中的加入可能是造成地幔富集的主要原因。侵入岩与成矿作用之间的关系,主要通过两方面所表现。一方面是二者间构造活动上的耦合性。另一方面是基性岩在成矿过程中可能发挥了重要的化学屏障层作用。     

大同遥测地震台网小震群活动与大同-阳高中强地震预报讨论

根据大同遥测地震台网记录到的小震群资料，用组合模式理论［１］对本区的小震群时空演化规律进行了分析研究。结果表明，对于１９８９年１０月１８日在本区发生的大同—阳高５．８级地震，利用震前小震群资料得出的预报震中与实际震中有较好的一致性。另外，通过震群与外因相关性的分析，对发震时间的预报也取得了较好的效果     

利用数字化雷达回波参数分析人工增雨播云条件

利用数字化测雨雷达观测的层状云雷达立体扫描资料和探空资料，分析得出层状云降水部分特征，并利用多元逐步回归获得催化作业效果指标y=2.0mm.h^-1，在使用雷达立体扫描资料进行人工增雨作业时指导方面做了探讨。     

胜利油田火山岩辉石中岩浆包裹体成分及有关成因问题

对胜利油田火山岩中辉石及其中岩浆包裹体成分的研究表明：ＣＯ２气藏区和非ＣＯ２气藏区新生代火山岩辉石及其中岩浆包裹体成分有明显区别,前者中辉石为普通辉石,成分相对富ＳｉＯ２,而贫Ａｌ２Ｏ３、ＴｉＯ２、ＭｇＯ和挥发成分;而后者中辉石为透辉石,成分相对贫ＳｉＯ２和挥发份,而富Ａｌ２Ｏ３、ＴｉＯ２和ＭｇＯ。前者岩浆包裹体玻相中富含ＣＯ２,包裹体中的金属子矿物多为黄铁矿;而后者岩浆包裹体玻相中贫ＣＯ２;包裹     

泡沫泥浆钻进工艺及护壁堵漏机理研究

介绍了所研制的ＤＦ－１型泡沫剂组分及性能；对泡沫泥浆钻进的配方进行了研究，得出的最优配方应用于现场，取得了较好的效果，并对泡沫泥浆的护壁机理进行了研究。     

Incorporating hydro-mechanical coupling in an analysis of the effects of rainfall patterns on unsaturated soil slope stability

Rainfall-induced landslides can cause loss of life and damage to property, infrastructure, and the environment. Rainfall patterns affect the pore-water pressure of unsaturated soil slopes, and are related to the slopes’ stability. Four rainfall patterns were chosen to represent natural rainfall patterns for an examination of rainfall infiltration into soil slopes using numerical models incorporating coupled water infiltration and deformation in unsaturated soils. Our analysis showed that rainfall patterns play a significant role in the distribution of the pore-water pressure in soil slopes, and influence the slope stability. The pore-water pressure profile of soil slopes and the factor of safety are affected by the ratio of rainfall intensity and the coefficient of permeability. The depth and shape of the shallow sliding plane of the landslide is closely related to the rainfall pattern; moreover, the results showed a correlation between the factor of safety of the slope and the rainfall intensity. This relationship can be described by a dimensionless rainfall intensity. The nonlinear relationship can be used to estimate the slope stability resulting from rainfall infiltration when the hydro-mechanical coupling in unsaturated soil slopes is considered.     

Improvement of pseudo-static method for slope stability analysis

traditional In this paper, two drawbacks pseudo-static method （vertical of the slice method） in the slope stability evaluation have been studied. First, the sliding mass is divided into vertical slices according to this method, which is irrational to some extent in the seismic design of slope. Second, only peak ground acceleration （PGA） is considered, and the effects of shaking frequency and duration on slope stability are neglected. And then, based on the theory of elastic wave and the summarized geological model, this paper put forwards an improved method of pseudo-method by using the theory of elastic wave and Hilbert-Huang transform. The improved pseudostatic method gives reasonable considerations to the time-frequency effects of seismic wave and its rationality has been verified by the shaking table test. This method can evaluate the safety of a slope, the happening time and the scale of landslides. At the same time, this method also can improve the high accuracy of the evaluation of the safety of the slope.