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关于阈值论文范文资料 与不同地层比功阈值优化统计方法其应用有关论文参考文献

版权:原创标记原创 主题:阈值范文 科目:职称论文 2024-03-24

《不同地层比功阈值优化统计方法其应用》:本论文为免费优秀的关于阈值论文范文资料,可用于相关论文写作参考。

摘 要:

采用在线监测系统监测进行随钻参数的采样和分析,建立了派生参数和直测参数的理论表达式,提出了多因素组合的地层比功模型,实现了地层地质条件和随钻参数的有机结合.以重庆市某高压变电站施工场地为依托,建立了不同地层如素填土层、粉质粘土层、砂岩层及泥岩层的地层比功演化曲线,对比地勘信息可知,不同地层的比功值存在显著差异.可见,合理的地层比功阈值是辨识地层类型的重要参量.运用统计学原理对勘测孔附近不同地层的比功值阈值进行保值优化,通过地勘获得的地层信息来验证阈值区间的可靠性.进一步采用如上地层比功阈值对该区域的其他桩位所在地层进行分析验证,说明了地层比功阈值优化的统计方法可行,其阈值区间合理,可用于其他赋存环境的地层比功阈值确定及地层识别.

关键词:

旋挖钻机;随钻参数;比功模型;统计分析;阈值优化

中图分类号:TU473.1

文献标志码:A文章编号:16744764(2017)02005807

Abstract:

The drilling parameters in the rotary drilling process were sampled and analyzed using online monitoring system. The theoretical expressions between the derived parameters and direct sampling parameters were constructed, and the model of formation work ratio considering multifactor combinations was also proposed to realize the perfect integration of geological conditions and drilling parameters. With the case study of a construction field of the high voltage substation in Chongqing, the curves of different formations such as backfilled soil, silty clay sandstone and mudstone formations were described and compared with the geological survey, the comparison presented obvious difference of different formations. The above results indicated that rational work ratio thresholds were significant to identify the strata characteristics. And then, the work ratio threshold of different formations was optimized near the surveying piles based on the statistical analysis theory to prove the reliability of the threshold range of different formations according to the geological information. In addition, the threshold value were used to verify the formations far away from the surveying piles, the results deeply calibrated the proposed method and verified the rationality of the threshold values. Therefore, the proposed method to determine the threshold range based on formation work ratio model can be used to another different formations and strata identification.

Keywords:

rotary drilling rig;drilling parameters;work ratio model;statistical analysis;threshold optimization

旋挖鉆机作为嵌岩桩成孔的一种重要施工方式,其钻进过程中的随钻参数和地层物性特征关联性研究不仅可以作为施工操作时的依据,还可为嵌岩持力层的判定提供基础数据.将旋挖钻机工作过程中的随钻参数进行采样分析,并建立基于相关直测参数和派生参数的理论表达式,提出多因素组合控制的地层比功数学模型,以实现随钻参数判定地层物性特征的目的 [13].因此,比功法是将地层地质赋存条件和随钻参数如钻进压力、回转速度、钻矩、钻进率、接触面积等因素综合考虑,是一种针对时时钻进过程中多因素综合指标的地层辨识方法.比功值作为体现岩土参数指标的重要参量,根据曲线的时空演化规律初步判定地层物性特征的变化.因此,以旋挖施工过程中的地层比功曲线的变化趋势即可识别不同地层且进行持力层辨识,使得施工过程具有可控性,提高了施工效率并终孔深度确定的可靠性.

近年来,比功法作为工程师和科学家认为较为合理的方法,实际应用成果不多.刘宝林等[4]根据钻孔深度的不同,将钻柱孔壁环节作为主要的影响因素并从能量传递角度,提出了钻机钻进过程中的优化原理.赵大军等[5]就钻机优化钻进在施工过程中的钻进特点进行了大量的研究,提出了在钻进过程中的比功法的原理以及比功值范围,并取得了丰硕的成果.

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结论:不同地层比功阈值优化统计方法其应用为关于本文可作为阈值方面的大学硕士与本科毕业论文阀值什么意思论文开题报告范文和职称论文论文写作参考文献下载。

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