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首页> 外文期刊>Scientific Research and Essays >Variation of Schmidt hammer rebound values depending on bed thickness and discontinuity surfaces
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Variation of Schmidt hammer rebound values depending on bed thickness and discontinuity surfaces

机译：施密特锤回弹值的变化取决于床的厚度和不连续表面

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In this study, Schmidt hammer rebound (HR) values of fine to medium-grained sandstone were measured to investigate the anisotropy effect on strengthaccording tothickness. The highest HR was measured from the thickest (132 cm) bed, with an average value of 43, while the lowest was measured from the thinnest (8 cm) bed, with an average value of 35. The variation of HR is determined as 23%. Similarly, theaverageofhighest uniaxial compressive strengthis77.73 MPa, while the lowestuniaxial compressive strength(UCS)is66.13 MPa. The variation of UCS is fixed as 17.5%. The porosity and dry unit weight of sandstone arerelyingon the internal characteristics (such as orientation-size-ratio of grain).Because of similar internal characteristics, theseproperties showsmall and irregular changes. The dry unit weight values show 1.77% variation, while porosity 0.61%. So they have small importance on bed strength. Semi-continuous bedding cause additional discontinuities. Moreover, application distance of the Schmidt hammer from the discontinuity surfaces highly affectsrebound values. Closeness of single discontinuity surfaces(30 cm)cause more than 10% increase in HR, while two discontinuity surfaces cause more than 20% variationwhen distancefrom the junction of surfacesisroughly 42 cm. This study clearly indicates that bedding and other anisotropic features can cause significant changesinstrength.
机译：在这项研究中，测量了中细粒砂岩的施密特锤回弹（HR）值，以研究各向异性对厚度的影响。从最厚的床（132厘米）测量最高的HR，平均值为43，而从最薄的床（8厘米）测量最低的HR，平均值为35。HR的变化确定为23 ％。同样，最高单轴抗压强度的平均值为77.73 MPa，而最低单轴抗压强度（UCS）的平均值为66.13 MPa。 UCS的变化固定为17.5％。砂岩的孔隙度和干重取决于其内部特性（例如晶粒的取向尺寸比）。由于内部特性相似，这些特性表现出较小且不规则的变化。干单位重量值显示出1.77％的变化，而孔隙度为0.61％。因此，它们对床强度的重视不大。半连续床上用品会导致其他不连续性。此外，施密特锤距不连续表面的应用距离对回弹值影响很大。单个不连续表面（30 cm）的紧密度会导致HR增加10％以上，而两个不连续表面在距表面交界处的距离大约42 cm时会导致20％以上的变化。这项研究清楚地表明，层理和其他各向异性特征会引起强度的显着变化。

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