吐拉盆地侏罗系油砂和沥青的地球化学特征   总被引：4，自引：0，他引：4  

杨忠芳  徐辉  曾凡刚 《现代地质》2001,15(3):297-301

吐拉盆地是中国西北地区的一个侏罗系沉积盆地 ,中生代时 ,与柴达木盆地连为一体。吐拉盆地J3油砂和沥青在有机地球化学特征上与J1-2 泥岩极为相近 ,表明这些沥青和油气是由J1-2 泥岩中干酪根热降解而成。这一研究结果对于指导柴达木西北缘侏罗系油气勘探具有重要的意义。  相似文献   

热反射技术及其在多年冻土区道路热保护中的应用     

王继伟  张明义  夏明海  马学良  刘国军  游志浪 《冰川冻土》2020,42(1):282-294

热反射技术是一项被广泛应用于建筑物及道路表面降温的主动冷却技术， 国内外很少对此技术在多年冻土区道路热保护方面进行研究。针对多年冻土区气候及工程环境特点， 综述了热反射技术在冻土区道路中的应用现状和研究成果， 阐述了热反射涂层的基本成分、 反射机理和测试方法， 分析了路用热反射涂层的材料性能、 反射效果和路用性能， 简要介绍了热反射涂层在路基边坡应用方面的研究进展。指出在当前条件下利用热反射涂层保护多年冻土区道路所遇到的问题及可行的解决方案， 并在此基础上提出了今后研究的重点： 从材料选择、 理论分析和试验方法入手， 对路用热反射涂层的颜色、 反射性能、 路用性能和区域适用性进行改进和研究， 加强多年冻土区道路热反射涂层的野外试验和分析， 深入研究复杂气候和工程环境下的热反射涂层性能。  相似文献   

Backcalculating pavement structural properties using a Nelder–Mead simplex search     

Jin‐Hak Yi  Sungho Mun 《国际地质力学数值与分析法杂志》2009,33(11):1389-1406

A structural integrity assessment technique of pavements that considers the backcalculation of material properties is herein proposed. In order to carry out the backcalculation, a Nelder–Mead simplex (NMS) search is applied to estimate the elastic moduli of layered structures using the deflection data simulated by falling weight deflectometer (FWD) tests. In order to utilize a forward calculation engine of the numerical simulation in the FWD testing, a wave analysis program of layered pavement systems is used based on a spectral element method. The performance of the NMS inversion technique is evaluated based on a comparison with the Levenberg–Marquardt method. Copyright © 2009 John Wiley & Sons, Ltd.  相似文献   

The Silurian Reservoir Bed—Differentiated Asphalts in Tarim Basin and Modeling Experiments on Their Origin     

刘洛夫  刘宏江  王洪玉  曾溅辉 《中国地球化学学报》2002,21(3):206-214

There is a type of asphalt that originated from differentiation from reservoir bed (named reservoir bed-differentiated asphalt)in the Silurian asphaltic sandstones of the Tarim Basin.These asphalts are the result of second-time charging of hydrocarbons into the Silurian reservoir,which were derived from Lower Paleozoic source rocks.Asphalt was differentiated from the reservoir bed in the hydrocarbon gathering area of secondary migration.The different-tiation is caused by changes in reservoir physical properties when pearl or chain hydrocarbons migrating through and gathering in the reservoir bed,and light components are lost and heavy ones are involved in the formation of asphalt or heavy oil.There are two kinds of occurrence of these asphalts in the Silurian system of the Tarim Basin.One is the poor heavy oil layer with lower oil saturation in trap and the other is scattered hydrocarbon distributed along the trans-port layer and unconformity surface.Reservoir bed-differentiated asphalts have two characteris-tics:total hydrocarbon content is high in extractable organic matter and the ratio of saturated to aromatic hydrocarbon is usually greater than unity.The physically modeling experiment has confirmed these characteristics and the genesis of the reservoir bed-differentiated asphalts.  相似文献   

青藏公路多年冻土段沥青路面热量平衡及路基稳定性研究   总被引：29，自引：18，他引：29  

王绍令  赵林  李述训  季国良  谢应钦  郭东信 《冰川冻土》2001,23(2):111-118

为彻底了解和治理青藏公路多年冻土段路基病害，选择昆仑山垭口和66道班两种不同并土类型路段，首次在沥青路面上开展路面辐射和热量平衡观测，并同时和路旁天然场地自然下垫面进行同项目的对比观测，通过观测和计算，研究了不同冻土类型路沥青路面下热量收支状况及路基热量年周转，找出了致使路基沉陷及产生融化核的根本原因，并对路基内融化核形成演化及其稳定性进行分析，计算了路基下人为上限达到最大深度及所需时间和融化核的最终稳定厚度，为青藏公路整治提出了可行性措施。  相似文献   

Sustainable Construction Case History: Fly Ash Stabilization of Recycled Asphalt Pavement Material     

Lin Li  Craig H. Benson  Tuncer B. Edil  Bulent Hatipoglu 《Geotechnical and Geological Engineering》2008,26(2):177-187

A case history is described where Class C fly ash was used to stabilize recycled pavement material (RPM) during construction of a flexible pavement in Waseca, MN, USA. The project consisted of pulverizing the existing hot-mix asphalt (HMA), base, and subgrade to a depth of 300 mm to form RPM, blending the RPM with fly ash (10% by dry weight) and water, compacting the RPM, and placement of a new HMA surface. California bearing ratio (CBR), resilient modulus (M_r), and unconfined compression (q_u) tests were conducted on the RPM alone and the fly ash stabilized RPM (SRPM) prepared in the field and laboratory to evaluate how addition of fly ash improved the strength and stiffness. After 7 days of curing, SRPM prepared in the laboratory had CBR ranging between 70 and 94, M_r between 78 and 119 MPa, and q_u between 284 and 454 kPa, whereas the RPM alone had CBR between 3 and 17 and M_r between 46 and 50 MPa. Lower CBR, M_r, and q_u were obtained for SRPM mixed in the field relative to the SRPM mixed in the laboratory (64% lower for CBR, 25% lower for M_r, and 50% lower for q_u). In situ falling weight deflectometer testing conducted 1 year after construction showed no degradation in the modulus of the SRPM, even though the SRPM underwent a freeze–thaw cycle. Analysis of leachate collected in the lysimeter showed that concentrations of all trace elements were below USEPA maximum contaminant levels.  相似文献   

沥青混凝土路面工程病害及防治技术浅析     

辛立华 《中国勘察设计》2011,(6):96-98

本文根据我国的公路越来越多地采用沥青混凝土或改性沥青混凝土路面的实际情况,论述了沥青路面早期病害的原因,指出了我国沥青路面规范的不足,介绍了沥青路面病害因素的分析及预防措施。  相似文献   

余杭泰山古油田     

罗璋 《浙江国土资源》1995,(1)

本文根据余杭泰山地区上震旦统灯影组砂岩、藻叠层石白云岩和下寒武统荷塘组以及中寒武统杨柳岗组产层状、似层状之固体沥青。经对固体沥青的分布范围、物化性质特征分析及古油田构造平衡剖面模拟的研究，确认了余杭泰山古油田的存在。对探索南方海相油气藏的分布，揭示了震旦统油气藏的形成—演化—破坏规律有着独特的意义。  相似文献   

青藏公路铺筑沥青路面后路基下多年冻土的变化   总被引：30，自引：12，他引：18  

王绍令  米海珍 《冰川冻土》1993,15(4):566-573

由于黑色沥青路面强烈吸热,使多年冻土区内约６０％路段的路基下人为上限逐年下降,造成冻土在垂向上呈不衔接接状,形成融化核,它加剧了路基不均匀沉陷,最后导致路面破坏,一路段路基下冻土类别发生变化或多年冻土层已完全融化。  相似文献   

Interaction study of permafrost and highway along Qinghai-Xizang Highway   总被引：14，自引：2，他引：14  

吴青柏  施斌  刘永智 《中国科学D辑(英文版)》2003,46(2):97-105

Qinghai-Xizang Highway crosses permafrost areas, sporadic permafrost areas and seasonal frozen soil areas. It is very important to study the engineering geology of frozen soil in construc-tion of cold regions engineering, and the choices of engineering st…  相似文献