中国东部岩石圈热状态与流变学强度特征   总被引：10，自引：1，他引：9  

汪洋  程素华 《大地构造与成矿学》2011,35(1):12-23

根据均衡原理制约的地热计算得到中国东部岩石圈的温度分布状态,以40、70、100km和莫霍面深度等温线图以及600°C、1100°C等温面深度的形式表示.同时计算了以1350°C等温面深度表示的中国东部的热岩石圈厚度.结果显示:在扬子克拉通西部四川盆地之下存在160～200km厚的岩石圈根,但在整个华北克拉通之下缺失岩...  相似文献   

软弱下卧层上持力岩层的端阻力特征值取值     

罗照华 《岩土工程技术》2011,25(6):271-277

在分析岩体特征和岩体力学强度的基础上,从基于岩石抗拉强度的冲切破坏模式出发,建立起软弱下卧层上岩体的冲切安全指标和冲切端阻值系数数学模型,再利用岩石的力学性质经验数据,计算出沉积岩的拉压系数、冲切安全指标、端阻值系数,并对各自的特征进行了分析,认为以单轴饱和抗压强度为端阻力特征值取值指标,对于软弱下卧层上抗压强度大、拉...  相似文献   

非饱和土抗剪强度随含水量变化的试验研究     

王兴兴  侯克鹏  马开川 《岩土工程技术》2011,25(6):278-280,285

在土力学中,非饱和土的抗剪强度一直是研究人员所关注的重点。土体的抗剪强度随含水量的不同变化明显。试验以云南某重塑土为研究对象,采用常规直接剪切试验为手段,对不同含水量土样的抗剪强度参数进行测定。试验结果表明,土样的抗剪强度不是单调地随含水量的增加而降低,而是呈现出有起有伏的抛物线状,对进一步认识土体强度随含水量变化规律有积极意义。  相似文献   

基于承压强度的滨海旅游行为分异特征     

许春晓  姜漫  田媛  王洁 《广东海洋大学学报》2011,31(5)

在强调幸福的时代,承压强度和旅游行为的关系是值得特别关注的问题。以减压作用明显的滨海旅游目的地为对象,用演绎方法确定压力层次结构,以指标层问题设计测试语句,采用问卷工具以抽样调查手段获得基础数据,通过德尔菲法结合层次分析法得到承压强度值,采用聚类方法得到承压强度的人群类型,利用单因素方差分析和多重变量的交叉列联表分析,发现3种承压强度的人群类型在出游动机、获取信息途径、开支预算、目的地偏好、交通类型5个方面存在显著分异,在出游方式偏好、旅游社选择、旅游住宿3个方面分异不明显。根据研究结论进行管理思考,得到了一些有益的启示。  相似文献   

Characteristics of dynamic strain and strength of frozen silt under long-term dynamic loading     

ShuPing Zhao  Wei M  GuiDe Jiao  XiaoXiao Chang 《寒旱区科学》2011,3(6):0478-0484

The dynamic strain and strength of frozen silt under long-term dynamic loading are studied based on creep tests. Three groups of tests are performed (Groups I, II, and III). The initial deviator stresses of Groups I and II are same and the dynamic stress amplitude of Group II is twice as that of Group I. The minimum value of dynamic stress in Group III is near zero and its dynamic stress amplitude is larger than those of Groups I and II. In tests of all three groups there are similar change trends of accumulative strain, but with different values. The accumulative strain curves consist of three stages, namely, the initial stage, the steady stage, and the gradual flow stage. In the tests of Groups I and II, during the initial stage with vibration times less than 50 loops the strain amplitude decreased with the increase of vibration times and then basically remained constant, fluctuating in a very small range. For the tests of Group III, during the initial and steady stages the strain amplitude decreased with the increase of vibration times, and then increased rapidly in the gradual flow stage. The dynamic strength of frozen silt decreases and trends to terminal dynamic strength as the vibration times of loading increase.  相似文献   

Analytical simulation of the dynamic compressive strength of a granite using the sliding crack model     

H. B. Li  J. Zhao  T. J. Li  J. X. Yuan 《国际地质力学数值与分析法杂志》2001,25(9):853-869

A sliding crack model is employed to simulate rock strength under dynamic compression. It is assumed that the growth and nucleation of a sliding crack array presented results in the shear fault failure and dominate the mechanical properties of rock material. The pseudo‐tractions method is used to calculate the stress intensity factor of the sliding crack array under compression. With the utilization of a dynamic crack growth criterion, the growth of the sliding crack array is studied and the simulated strengths of a granite under dynamic compression are correspondingly obtained. It is concluded that the simulated rock strengths increase with increasing strain rates at different confining pressures, and the rising rates have a trend to decrease with increasing confining pressures. It is also indicated that the simulated rock strengths increase with increment of confining pressure at different strain rates, and the rising rates are almost identical at different strain rates. The simulation results are validated by the experimental data for the granite. Copyright © 2001 John Wiley & Sons, Ltd.  相似文献   

Determination of rock mass strength properties by homogenization     

A. Pouya  M. Ghoreychi 《国际地质力学数值与分析法杂志》2001,25(13):1285-1303

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An assessment of borehole sealing performance in a salt environment     

H. Akgün 《Environmental Geology》1997,31(1-2):34-41

 Design of plugs for abandonment of boreholes and shafts may be governed by the bond strength between the plug and host rock. This paper presents the results of push-out tests on cement grout plugs in salt. Two types of expandable cement grouts have been tested. The average interface shear strengths ranged from 2 to 12 MPa (290 to 1740 psi). Peak shear stresses at failure, assuming an elastic stress distribution along the interface, were up to eight times higher. Standard deviations commonly reached 20%. Dissolution along the interface was observed, and may have been enhanced by clay inclusions in the salt. This dissolution appears to have reduced bond strengths. Application of the results to the design of plugs for larger openings (for example, shafts, drifts, or boreholes) is discussed. Received: 6 March 1996 · Accepted: 16 July 1996  相似文献   

氯氧镁水泥固化淤泥力学特性及微观机制     

王东星  陈政光 《岩土力学》2021,(1):77-85,92

将氯氧镁水泥(MOC)创新性地引入淤泥固化,通过无侧限抗压强度、固化体含水率、扫描电子显微镜(SEM)和X射线能谱测定(EDS)等试验,研究了初始含水率、MgO/MgCl2摩尔比、养护龄期和MgO活性等复杂因素对淤泥固化效能影响及其驱动机制。结果表明:初始含水率越高,试样强度越低,中等含水率时MOC固化淤泥中出现针杆状的3相或5相晶体;随MgO/MgCl2摩尔比升高,试样抗压强度随之增加,水化产物从无定形凝胶逐渐转化为3相、5相和Mg(OH)2晶体;随养护龄期延长,固化淤泥强度总体呈上升趋势,28d前强度增长相对较快,28d后强度趋于稳定;养护后期,MgO/MgCl2摩尔比较高的试样表面易出现泛霜现象;MgO活性提高使得MOC固化淤泥试样含有更多有效活性组分,无侧限抗压强度更高,但MgO活性高低对水化产物演变规律并无显著影响。研究成果可为绿色、低碳MOC基胶凝材料研发及其在淤泥固化等土体加固领域中应用提供理论支撑。  相似文献   

鄂尔多斯盆地膏质白云岩有利储层的成因及演化     

何明倩  黄文辉  久博 《地学前缘》2021,28(4):327-336

膏质白云岩是鄂尔多斯盆地中东部下古生界马家沟组M5₁最有利储层,影响膏质白云岩储层性质的最大因素在于溶蚀作用。本文在已有的研究基础上,应用岩心资料及阴极发光、地球化学等方法,测定M5₁膏质白云岩及其特殊的示底构造的化学成分,并分析其成因模式。岩心、薄片以及物性资料显示:石膏溶蚀形成的大量膏模孔及伴生的次生孔是储层的主要储集空间,示底构造规模性出现于膏质云岩中。阴极发光、常微量元素分析结果显示:示底构造上部充填埋藏期方解石;下部充填碎屑白云石,与示底构造外围的准同生期泥-粉晶白云石具有相近的地球化学特征,与深部埋藏期形成的细-中晶白云石差异明显。示底构造的演化是膏质白云岩有利储层形成的重要依据,本文依据化学离子平衡原理,对不同成岩阶段发生的溶蚀作用、填充作用进行离子间相互置换的重演,分析得知不稳定的化学组成是石膏易被溶蚀的内在原因,石膏的规模性溶蚀是膏质云岩有利储层形成的关键。  相似文献