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A Combined-Power Model for the Distribution of Axial Force in Shaft Anchor along Its Length 总被引:1,自引:0,他引:1
INTRODUCTIONThe anchorage of geomaterial , including shaftanchors and prestressed tendons ,is usually used ingeotechnical engineering. Owing to various advanta-ges ,these two anchorage types are widely used instructures in China ( Cao et al ., 2003 ; Fu et al .,1999 ;Lu et al .,1998 ; Li et al .,1995) . Shaft an-chors can be classifiedinto three kinds by the forceinthe shaft and cement grout :tensile ,press ,and sheartype (Lu et al .,1998) . The tensile type is the mostpopular in China… 相似文献
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我国山地旅游资源丰富。随着山地旅游资源的快速发展,山地旅游区地质灾害频发。以浙江省蛇蟠岛国家矿山公园野人洞景区某危岩体为例,在进行现场工程地质调查的基础上,根据2016年度该景区统计的客游量计算得出该研究区属于发生地质灾害高风险区的结论,并提出了“可绿化的加锚钢筋混凝土板与浆砌块石混合体”的防治对策。这对于其它山地景区的同类问题具有一定参考价值。 相似文献
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Determination and Application of the Sharp Degradation Point of Concrete under Environmental Actions
INTRODUCTIONMany experi mental results have indicated thatthe deterioration process of concrete can be dividedinto two stages—the nondestructive stage (stage 1)and the destructive stage (stage 2) ,as shownin Fig.1 ( Wu, 2002 ; Rostam, 1993) . When concrete issubjected to environmental actions ,the inner energyit gains is al most balanced by the released energywhen crackingin stage 1 , while in stage 2 the innerenergy is greater than that released. There are fewremarkable degradation phe… 相似文献
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盆地的热体制研究对盆地构造演化与油气勘探意义重大。岩石放射性生热率是岩石重要的热物性参数,是研究盆地热体制的基础数据之一。不同于传统的分析测试方法,自然伽马(GR)—生热率(A)换算只需要GR测井就可以计算生热率。笔者利用塔里木盆地不同地区20口主要钻井的GR测井数据计算了沉积层共6094个生热率数据,建立了代表性钻井岩性测井—生热率对比图、塔里木盆地地层生热率柱,估算了盆地沉积层放射性生热对地表热流的贡献及对深部地层的增温效应。结果表明,塔里木盆地沉积层的平均生热率为1. 17±0. 336μW/m3,岩性是地层生热率的主控因素,泥岩生热率最高,为1. 96±0. 318μW/m3,砂岩次之,为0. 99±0. 264μW/m3,白云岩和灰岩生热率较低,分别为0. 44±0. 362μW/m3和0. 36±0. 408μW/m3。根据地层生热率,估算沉积层生热贡献的热流为9. 36mW/m2,约占地表总热流的21%,沉积层生热对地温梯度的贡献约为3. 3℃/km,放射性生热对属于“冷盆”的塔里木盆地的地温场具有不容忽视的影响。 相似文献
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