摘要
采用在线监测系统监测进行随钻参数的采样与分析,建立了派生参数与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与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。
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 multi-factor 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 stratacharacteristics. 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. threshold range based on formation work ratio model Therefore, the proposed method to determine the can be used to another different formations and strata identification.
出处
《土木建筑与环境工程》
CSCD
北大核心
2017年第2期58-64,共7页
Journal of Civil,Architectural & Environment Engineering
基金
中央高校基本科研业务费(106112014CDJZR200014
106112014CDJZR200015)
国家自然科学基金(51478065)
国家山区公路工程技术研究中心(GSGZJ-2015-09)~~
关键词
旋挖钻机
随钻参数
比功模型
统计分析
阈值优化
rotary drilling rig
drilling parameters
work ratio model
statistical analysis
threshold optimization
