水平定向钻穿越回拖力的计算方法及其分析
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摘要
因为实际工况比较复杂,水平定向钻穿越的回拖力是各种因素共同作用的结果,所以,很难建立起与实际工况非常吻合的、具有普遍适用性的力学模型。文章以国内外有关研究的结果和力学理论为基础,以工程实际的统计资料为依据,对目前常用的卸荷拱土压力计算法、净浮力计算法和绞盘计算法等3种计算方法进行分析和完善,并提供了计算实例。实践证明,绞盘计算法的力学模型和计算结果与实际工况相对接近。推荐采用这种方法进行回拖力的估算。
Because of the complicated operation conditions, the pull-back force of pipeline crossing by horizontal directional drilling depends on the combined actions of various factors. Thus, establishing a mechanical model that meets actual operation condition closely and has a common applicability is very difficult. Based on the related research achievements at home and abroad and the mechanical theory as well as the statistic information from practical projects, this paper analyses three calculational methods in common use, i.e. unloading arc earth pressure calculation, net buoyancy calculation and winch calculation, and makes some improvements on them; then it gives practical calculatioal instances. It is shown that the mechanical model of winch calculation method and its calculated result are relatively close to the practical operation condition. So using winch calculation method for pull-back force estimation is strongly recommended.
Because of the complicated operation conditions, the pull-back force of pipeline crossing by horizontal directional drilling depends on the combined actions of various factors. Thus, establishing a mechanical model that meets actual operation condition closely and has a common applicability is very difficult. Based on the related research achievements at home and abroad and the mechanical theory as well as the statistic information from practical projects, this paper analyses three calculational methods in common use, i.e. unloading arc earth pressure calculation, net buoyancy calculation and winch calculation, and makes some improvements on them; then it gives practical calculatioal instances. It is shown that the mechanical model of winch calculation method and its calculated result are relatively close to the practical operation condition. So using winch calculation method for pull-back force estimation is strongly recommended.
引文
[1]栾希炜,陈同彦,王文成.外钓岛—册子—镇海海底管道穿越工程中的技术创新[J].石油工程建设,2002,(4):40-42.
[2]颜纯文,D.Stein.非开挖地下管线施工技术及其应用[M].北京:地震出版社,1999.71.
[3]柳金海.不良条件管道工程设计与施工手册[M].北京:中国物价出版社,1992.26-28.
[4]刘大鹏,尤晓伟.土力学[M].北京:清华大学出版社,北京交通大学出版社,2005.197-204.
[5]Technical note:Horizontal directional drilling(guided boring)with PLEXCOpipe[J].TrenchlessTechnoloygBulletin,1999,(1):19-20.
[2]颜纯文,D.Stein.非开挖地下管线施工技术及其应用[M].北京:地震出版社,1999.71.
[3]柳金海.不良条件管道工程设计与施工手册[M].北京:中国物价出版社,1992.26-28.
[4]刘大鹏,尤晓伟.土力学[M].北京:清华大学出版社,北京交通大学出版社,2005.197-204.
[5]Technical note:Horizontal directional drilling(guided boring)with PLEXCOpipe[J].TrenchlessTechnoloygBulletin,1999,(1):19-20.
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