大直径钻孔桩施工工艺

简单介绍了大孔径、深桩基、复杂地质层钻孔灌注桩施工工艺控制,重点论述气举反循环成孔工艺在深桩基钻孔施工中的应用以及采用旁置式漏斗灌注混凝土施工。     

沈阳地铁竖井定向测量主要方法探讨

结合沈阳地铁一号线采用矿山法施工的区闻或车站联系测量应用实例,针对不同的施工条件,从理论和实践上探讨浅埋暗挖隧道竖井联系测量的几种有效方法及其适用范围.     

沙特麦加轻轨铁路路堑与车站石方开挖深孔爆破

介绍沙特麦加轻轨铁路路堑与车站土石方开挖深孔控制爆破设计与施工。与此同时概述沙特深孔爆破基本情况,并结合我国工程爆破技术水平进行扼要对比分析,达到优势互补、互相交流、不断发展提高我国工程爆破技术水平的目的。     

津秦客专隧道钻爆法施工技术

隧道钻爆法施工中不要拘泥于施工图设计给定的施工方案,应根据现场的环境条件、地质条件、断面大小、结构形式、施工工期等因素,灵活选择适宜的施工方法、施工工艺。结合津秦铁路客专隧道施工情况,详细介绍了对钻爆法隧道施工的一些认识。     

Research and application of non-clay low damage temporary bridging drilling/ completion fluids system

Following the basic theory of protecting gas-reservoirs from damage with the temporary bridging technology, inert calcium carbonate (CaCO3) particles, whose diameter is consistent with the size of pores or apertures in the reservoir, were selected as the bridging agent, and modified resolvable starch was selected as filtration loss reducing particles to form the non-clay low damage temporary bridging drilling/completion fluids system (NLTDFS). Under the simulated condition of the well bottom during real drilling, NLTDFS was used to conduct dynamic and static damage experiments of cores for 48 hours, respectively, and then the experimented cores were permeated with pure nitrogen from the undamaged end to the damaged one to measure their recovery of permeability. The results showed that the permeability recovery rate of the core reached 90% or so, and the damaged depth was less than 1 cm, which demonstrates that NL TDFS has higher temporary bridging effectiveness and lower damage to the gas-reservoir than other drilling fluids system. NLTDFS has been used to drill many horizontal wells, and four of them have obtained high yield of natural gas. The yield of natural gas of LPl well reached 85 X 104 m3/day after completion with the rump pipe. The formation of the stable well wall and smooth drilling led to an API loss less than 4 mL and an HTHP loss less than 15 mL.     

钻孔法检测残余预应力的有限元计算

用有限元法计算平板构件和预应力混凝土梁在钻孔前后的应力应变分布。结果表明,钻孔法检测预应力混凝土梁的残余预应力时,应变片的位置选择很重要;建议合理的贴片位置,并给出检测残余预应力时的修正系数。这一研究成果是钻孔法检测预应力混凝土梁残余预应力的基础,可以为该方法的工程应用提供参考。     

南渡江定向钻穿越技术

针对南渡江穿越水平定向钻施工,采用了大口径、长距离、复杂地质条件下的水平定向钻施工技术,讨论了路由选择和曲线设计原则,并对此条件下的导向孔钻进、扩孔、回拖、泥浆配制等技术进行了分析,有效地解决了抱钻等常见问题。     

岩溶及破碎地层对桥梁桩基成孔的影响及处置措施

针对破碎地层及岩溶发育地区桥梁桩基成孔中遇到漏浆塌孔问题,通过钻孔注浆实践,有效地解决了工程中遇到的问题,提高了功效,确保了桩基质量,对以后类似工程的设计与施工有一定的借鉴意义。     

船舶结构优化设计技术研究进展

  目的  为了实现安全、轻量化的钻井船结构设计,通常需要进行结构优化。  方法  构建一个基于ISIGHT平台和有限元法的结构优化平台。建立深水钻井船的参数化模型,将板厚和加强筋尺寸视作离散变量,在搭建的优化平台上进行横向结构优化。  结果  经过结构优化后,深水钻井船横向构件的结构重量可降低11%。  结论  研究表明,对深水钻井船进行强框架结构优化设计可有效减轻结构重量。     

水运岩土工程勘察纲要编写要点解析

如何编写好有针对性的勘察纲要关系到能否高效、优质地完成勘察工作,这就要求岩土工程师不但要有扎实的 专业知识,而且要深入了解设计意图,加强与设计沟通,把隐含信息挖掘出来,了解勘察目的;在充分收集和分析相关资 料、进行现场踏勘的基础上,根据工程基础的性质,合理布置钻孔,确定孔性、孔深,有针对性地安排土工试验项目;勘 察纲要在具体实施过程中应根据现场具体的地质条件变化动态调整,使其始终起到指导作用。