Local Joint Flexibility Multibrace Tubular Joints

The local joint flexibility matrix of multibrace tubular joints (uniplanar and multiplanar joints) is defined. The formulation for computing the elements of local flexibility factor matrix of multibrace tubular joints by semi- analytic method is presented in this paper. The stiffening effect of unloaded braces and cross-flexibility between braces are discussed. Using the local flexibility of unibrace joints instead of that of multibrace joints in conventional structural analysis will lead the result to an unsafe side.     

Experimental Researches on Reflective and Transmitting Performances of Quarter Circular Breakwater Under Regular and Irregular Waves

A series of regular and irregular wave experiments are conducted to study the reflective and transmitting performances of quarter circular breakwater (QCB) in comparison with those of semi-circular breakwater (SCB). Based on regular wave tests, the reflection and transmission characteristics of QCB are analyzed and a few influencing factors are investigated. Then, the wave energy dissipation as wave passing over the breakwater is discussed based on the hydraulic coefficients of QCB and SCB. In irregular wav...     

基于熵值-理想点法的泥石流危险度研究

泥石流危险度的划分是泥石流研究中的重点与难点,泥石流危险度的确定对于泥石流整体特征的把握具有十分重要的作用。采用熵值-理想点法建立了泥石流危险度划分模型,选取流域面积、主沟长度与泥石流沟相对最大高差等10个评价指标。利用现场3条泥石流沟作为工程评价对象,通过熵值法确定各评价指标的权重系数,并采用理想点法进行泥石流危险度的划分研究。根据模型分析结果,泥石流沟2与3属于高危险度(贴近度为0.79与0.83),泥石流沟1属于中危险度(贴近度为0.82)。泥石流危险度与现场情况及已有研究资料基本一致,证明了该法在泥石流危险度划分中的合理性与有效性。     

宁东鸳鸯湖矿区梅花井煤矿112201工作面探放水实践

112201工作面是梅花井煤矿首采工作面,位于矿井南端浅部,切眼靠近鸳鸯湖背斜轴部。工作面涌水量从2009年4月份开始回采时的15m3/h,增至2010年3月份的230m3/h。工作面的突然涌水导致大量淋水,从而使采区底板严重泥化,给矿井安全生产带来巨大威胁。分析认为,工作面的主要充水水源为2-1煤的顶板含水层（七里镇砂岩）,主要通道为顶板的采动裂隙带。通过实施探放水和疏放水工程,工作面下隅角的涌水量由180m3/h降至30m3/h以内,极大的减少了含水层突然涌水对工作面的危害,为梅花井乃至鸳鸯湖矿区防治水工作起到了积极作用。     

基于合成孔径雷达差分干涉测量技术的矿区地面形变分析

介绍了合成孔径雷达差分干涉测量（D—InSAR）技术的基本原理和D-InSAR数据处理流程,采用双轨法D-InSAR处理了4景覆盖济宁某矿区的卫星ENVISATASAR数据,分别提取了增强差分干涉图、相应的相干图以及矿区地面形变图,并对其进行了简单分析。对从矿区地面沉降分布、沉降面积统计进行矿区地面沉降分析;选取研究矿区的部分水准监测结果与D-InSAR监测结果相比较的方式进行精度分析。说明了13-InSAR技术在矿区地面沉降监测应用中应该注意的事项。     

东营凹陷沙河街组三段层序低位域砂体沉积特征

本文基于构造层序分析和基准面分析原理，利用测井曲线，岩相等资料，重点研究了东营凹陷沙三段3个层序的低位域砂体沉积特征，发育规律及其石油地质意义。应用构造坡折带的概念在该凹陷划分出了4种构造坡折带样式。研究表明：该凹陷沙三段层序低位域砂体发育下切水道充填，低位楔和低位扇。构造坡折带的发育特征和样式控制了低位域砂体的时空展布特征。构造坡折带控制下的低位域砂体发育在层序底部，构造坡折带附近，成藏条件优良，是隐蔽油气藏勘探的主要方向。     

低渗透油藏薄差油水层解释方法研究

本文分析了影响永乐油田葡萄花油藏薄差油水层解释精度的因素，提出了永乐油田薄差层流体识别的有效方法，为外围油田新区钻井运行及射孔方案编制提供较为准确的基础数据。     

Sporopollen Assemblages from the Cretaceous Yimin Formation of the Hailar Basin, Inner Mongolia, China

Three sporopollen assemblages are recognized for the first time from the Cretaceous Yimin Formation in the Hailar Basin of eastern Inner Mongolia. They are （in ascending order）： the lmpardecispora-Aequitriradites- Clawttipollenites assemblage; the Triporoletes-Pilosisporites-Asteropollis assemblage; and the Appendicisporites- Asteropollis-Tricolpites assemblage, distributed in Members 1, 2 and 3 of the Yimin Formation respectively. Recognition of this biostratigraphic sequence is very important for the division and correlation of the Yimin Formation in the basin. Meanwhile, the age of the Yimin Formation is considered to be Barremian to Early Albian based on the palynological data.