典型河相地层条件下非开挖定(导)向钻进施工技术研究
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摘要
非开挖导向钻进作为一项绿色、环保、高效、节能的新型铺管技术,已逐渐被人们所接受,且已被国际建筑行业公认为一个很有发展前景的分支。本文在分析典型河相地层地质条件的基础上,采用理论与实践相结合的方式,对典型河相地层条件下非开挖导向钻进施工关键技术进行研究,具体内容如下:
     1.通过对砂卵石地层条件下导向钻进时孔壁稳定性差成孔难度高等的原因进行深入分析,提出了采用注浆预处理技术,达到提高砂砾层钻孔孔壁稳定性的目的;
     2.通过对非开挖施工中泥浆的稳定孔壁、携带钻屑、润滑减阻等功用分析,提出了针对注浆预处理后砂砾层的非开挖专用泥浆配方;提出在岩层、砂砾层中润滑减阻的泥浆配置方案;
     3.通过分析,提出气动潜孔锤冲击回转钻进+牙轮扩孔器反向扩孔施工工艺为硬岩地层施工的首选工艺。并对该工艺进行了优化设计,提出了不同地层条件下的最优施工参数选取方法;
     4.分析了河相地层施工中,根据不同的已知条件进行导向轨迹设计的方法。对影响导向轨迹的因素进行了相应分析,并提出相应改进措施;
     5.通过借鉴土压力的计算模式,提出河相地层条件下管道回拖力的计算分析方法,为非开挖导向钻进铺管的技术参数的选取提供依据;
     6.通过对典型河相地层条件下非开挖导向钻进案例的分析,对该类河流穿越施工工艺进行详细的论述,对施工中出现的诸如:导向轨迹与设计轨迹偏离、钻杆钻具折断脱落、导向钻进或扩孔时卡夹钻、气动锤钻头堵塞等常见事故的产生机理进行了深入的分析研究,并据此提出相应的事故预防与处理措施。
Trenchless-guided drilling technology, which is, as a new pipelaying method, environment-protective, efficient and energy-saving, has been widely accepted gradually, and moreover, has been recognized as a most promising branch of construction industry. In this thesis, the author takes both an academic and a practical way to study the key technology of trenchless-guided drilling and construction in the typical fluvial facies conditions, according to the analysis of typical fluvial facies stratum and terra conditions. The specific contents are as follows:
     1. This thesis makes a profound study of the reasons why the hole wall is not that strong when trenchless-guided drilling technology is adopted under scree environment. The author introduces slip-casting pretreatment technology to enhance the stability of the hole wall in hardpan condition.
     2. Through the analysis of functions of drilling mud such as leveling off hole wall, schlepping sludge, lubrication and drag reduction of slurry in the process of trenchless-guided drilling and construction, the author brings forward the special slurry recipe for hardpan's trenchless-guided drilling after slip-casting pretreatment, and the slurry formula for the purpose of lubrication and drag reduction in the drilling process of terrane or hardpan.
     3. The author advances of impacting gyration drilling+reverse Expander as the preferred choice in hard rock stratum constructions, and furthermore, optimize this techniques and introduces the best method for the optimum selection of construction parameters in different stratum conditions;
     4. The author analyses the relevant factors which may influence guided tract, and advances the relevant improving measures.
     5. Using for reference calculation of the earth pressure, the author suggests a calculation method of pipe and canal return-pull power in fluvial facies stratum, which offers gist for choosing parameters in trenchless-guided drilling and spreading pipe technology.
     6. The author analyses the typical trenchless-guided drilling cases under fluvial facies stratum condition, discusses this kind of river traversing techniques in detail, and makes a deep research into the causes of usual accidents, such as, the departure of guiding tract from designed tract, the fall or breaking off of drill stems or drill tools, blocking of niping drill, pneumatic hammer, aiguille, etc. in the process of guided drilling or hole expanding, and hereby advances corresponding measures for prevention and management of these accidents.
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