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Parker公式的一系列推广及其在石油重力勘探中的应用前景 被引量:15
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作者 柴玉璞 贾继军 《石油地球物理勘探》 EI CSCD 北大核心 1990年第3期321-332,378,共13页
本文采用一种比较简捷的方法,对Parker公式作了一系列推广,导出了Parker公式的各种具体形式,并且最终导出了任意变密度Parker公式公式揭示了密度函数、界面函数和重力效应函数之间的关系。它的各种具体形式(如指数型变化的密度模式的Par... 本文采用一种比较简捷的方法,对Parker公式作了一系列推广,导出了Parker公式的各种具体形式,并且最终导出了任意变密度Parker公式公式揭示了密度函数、界面函数和重力效应函数之间的关系。它的各种具体形式(如指数型变化的密度模式的Parker公式、多项式密度模式的Parker公式等)在石油重力勘探中有广阔的应用前景。在数值计算方面,采用了乘子法和移样法两项新技术,保证了任意复杂密度模型的正演精度与空间域常密度正演精度相当。理论模型和应用实例表明方法有良好的效果。 展开更多
关键词 重力资料解释 任意变密度Parkef公式 乘子 移样法
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Experimental and numerical study on crack propagation in pre-cracked beam specimens under three-point bending 被引量:7
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作者 Hadi Haeri 《Journal of Central South University》 SCIE EI CAS CSCD 2016年第2期430-439,共10页
A simultaneous experimental and numerical study on crack propagation in the pre-cracked beams specimens(concrete-like materials) is carried out using three-point bending flexural test. The crack propagation and coales... A simultaneous experimental and numerical study on crack propagation in the pre-cracked beams specimens(concrete-like materials) is carried out using three-point bending flexural test. The crack propagation and coalescence paths of internal cracks in side beam specimens are experimentally studied by inserting double internal cracks. The effects of crack positions on the fracturing path in the bridge areas of the double cracked beam specimens are also studied. It has been observed that the breaking of concrete-like cracked beams specimens occurs mainly by the propagation of wing cracks emanating from the tips of the pre-existing cracks in the numerical and experimental analyses, respectively. The same specimens are numerically simulated by an indirect boundary element method(IBEM) known as displacement discontinuity method(DDM) using higher displacement discontinuity. These numerical results are compared with the existing experimental results. This comparison illustrates the higher accuracy of the results obtained by the indirect boundary element method by using only a small number of elements compared with the discrete element method(PFC2D code). 展开更多
关键词 double internal cracks concrete-like specimens crack propagation
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Double pull specimen more suitable for measuring bond-slip relationship of FRP-to-concrete interface 被引量:1
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作者 杨奇飞 陆小华 熊光晶 《Journal of Central South University》 SCIE EI CAS 2010年第2期400-405,共6页
A new "conceptual" design named "double pull" specimen was proposed in order to measure the bond-slip(δ-τ) relationship of fiber reinforced polymer(FRP)-to-concrete interface more accurately.A fi... A new "conceptual" design named "double pull" specimen was proposed in order to measure the bond-slip(δ-τ) relationship of fiber reinforced polymer(FRP)-to-concrete interface more accurately.A finite element analysis(FEA) was performed for preliminarily evaluating the suitability of the proposed conceptual double pull specimen.Through the FEA,it was indicated that the FRP-to-concrete interface of the proposed conceptual specimen might subject to a much higher load level than that of the most commonly used simple shear specimen,showing a great potential for measuring δ-τ relationship more accurately.In the light of the conceptual specimen,a kind of "practical" double pull specimen was developed and proved to be more suitable for measuring δ-τ relationship through an exploratory experimental study with 20 specimens.Consequently,an experimental program with 10 double pull specimens was performed for measuring the ultimate slip δu which was difficult to capture by using the existing specimens.It is shown that the range of δu is 0.31-0.52 mm based on the test results.The suggestion for improving the measure method is also put forward. 展开更多
关键词 fiber reinforced polymer (FRP) concrete BOND-SLIP ultimate slip double pull specimen EXTENSOMETER
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