评价初级和次级粗糙度的地质统计学算法

IF 2.5 3区 工程技术 Q2 ENGINEERING, CIVIL Geomechanics and Engineering Pub Date : 2021-01-01 DOI:10.12989/GAE.2021.24.4.359
H. Nasab, S. Karimi-Nasab, H. Jalalifar
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引用次数: 0

摘要

节理粗糙度是初级和次级粗糙度的结合。通常,初级粗糙度是节理表面具有周期性的地质统计部分,而次级粗糙度或不均匀度是节理表面具有随机性的统计部分。使用粗糙度生成算法是评估关节粗糙度的有效方法。在确定节理剖面地质统计参数的基础上,提出了两种基于蒙特卡罗方法的粗糙生成算法,分别用于评价初级(GJRGAP)和次级(GJRGAS)粗糙度。这些基于地统计学参数(距离和井距)和统计学参数(凹凸度高度标准差SDH和凹凸度角标准差SDA)生成二维节理粗糙度剖面。在本研究中,根据距离和SDH定义了不同的地质统计区域。随着SDH的增加,生成的凸起高度增加,凸起变得更加尖锐,在特定范围内(特定曲线)SDH与SDA呈线性关系。随着GJRGAP范围的增大(凸起的底部),凸起的形状变得更平坦。结果表明,随着SDH的增大和距离的减小,关节剖面的SDA增大。SDA的增大导致接头粗糙度参数Z2、Z3和Rp增大。结果表明,二次粗糙度或不均匀度对粗糙度值有较大影响。总的来说,可以得出结论,从实验室尺度接近现场尺度,凸起的形状和大小是合适的参数。
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Geostatistical algorithm for evaluation of primary and secondary roughness
Joint roughness is combination of primary and secondary roughness. Ordinarily primary roughness is a geostatistical part of a joint surface that has a periodic nature but secondary roughness or unevenness is a statistical part of that which have a random nature. Using roughness generating algorithms is a useful method for evaluation of joint roughness. In this paper after determining geostatistical parameters of the joint profile, were presented two roughness generating algorithms using Mount-Carlo method for evaluation of primary (GJRGAP) and secondary (GJRGAS) roughness. These based on geostatistical parameters (range and sill) and statistical parameters (standard deviation of asperities height, SDH, and standard deviation of asperities angle, SDA) for generation two-dimensional joint roughness profiles. In this study different geostatistical regions were defined depending on the range and SDH. As SDH increases, the height of the generated asperities increases and asperities become sharper and at a specific range (a specific curve) relation between SDH and SDA is linear. As the range in GJRGAP becomes larger (the base of the asperities) the shape of asperities becomes flatter. The results illustrate that joint profiles have larger SDA with increase of SDH and decrease of range. Consequencely increase of SDA leads to joint roughness parameters such Z2, Z3 and Rp increases. The results showed that secondary roughness or unevenness has a great influence on roughness values. In general, it can be concluded that the shape and size of asperities are appropriate parameters to approach the field scale from the laboratory scale.
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来源期刊
Geomechanics and Engineering
Geomechanics and Engineering ENGINEERING, CIVIL-ENGINEERING, GEOLOGICAL
CiteScore
5.20
自引率
25.00%
发文量
0
审稿时长
>12 weeks
期刊介绍: The Geomechanics and Engineering aims at opening an easy access to the valuable source of information and providing an excellent publication channel for the global community of researchers in the geomechanics and its applications. Typical subjects covered by the journal include: - Analytical, computational, and experimental multiscale and interaction mechanics- Computational and Theoretical Geomechnics- Foundations- Tunneling- Earth Structures- Site Characterization- Soil-Structure Interactions
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