水平定向钻进管道敷设地层响应实验分析Test Analysis of Soil Response in Pipeline Installation by Horizontal Directional Drilling Technology
孙平贺;曹函;乌效鸣;安传德;
摘要(Abstract):
在应用水平定向钻进非开挖技术进行近地表管道敷设时,由于上覆地层厚度(C)、钻孔直径(D)和钻井液压力(p)三者无法准确设计,往往会导致地表的变形,进而形成裂缝通道致使地表发生钻井液的溢流。分析了非黏聚力地层的溢流通道形式,同时推导了极限钻井液压力的计算公式。结合室内外实验及应用情况,得出了实测钻井液压力和计算钻井液压力同C/D值的变化规律,即C/D越大,极限钻井液的压力值也就越高。在同一地层中,一般钻井液压力的峰值出现在水平孔段的中间位置。根据C/D值,在保证钻井液不发生溢流的情况下,得出了不同水平孔径范围所对应的上覆地层最小厚度。
关键词(KeyWords): 非开挖;极限压力;地层响应;地表溢流
基金项目(Foundation): 中央高校基本科研业务专项(2012QNZT070);; 中南大学博士后科学基金;; 岩土钻掘与防护教育部工程研究中心2011项目
作者(Author): 孙平贺;曹函;乌效鸣;安传德;
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DOI:
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