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白垩系地层冻结压力实测与双层井壁结构优化设计
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摘要
本文以内蒙地区白垩、侏罗系地层冻结法凿井为研究背景,用理论分析、现场实测和数值模拟的方法,对白垩、侏罗系地层双层钢筋混凝土井壁结构的受力特征进行了研究,并以此为基础获得了井壁结构优化方案,得到了丰硕的经济和社会效益。
     通过实验研究,获得了白垩、侏罗系地层冻结岩石的物理力学性能,并通过对比,得到了中东部地区和西部地区冻结岩土(石)物理力学性能的差异。通过理论分析,获得了双层钢筋混凝土井壁结构的受力机理和主要外荷载的取值及计算方法,并论述了双层井壁结构形式的设计计算方法。通过现场实测,获得了白垩系地层冻结段冻结压力和钢筋应力(竖向和环向)的发展规律,并通过实测数据结合理论分析得到了白垩系地层冻结压力的计算公式。在此基础上,结合理论分析,对泊江海子矿主、副、风三个井筒的双层钢筋混凝土井壁结构提出了优化方案,并通过计算,证明了优化方案的可行性,同时论证了通过优化得到的直接间接经济效益非常显著。最后通过数值模拟,对白垩系地层双层井壁结构的受力特征进行了研究,得到了大量的数值模拟结果和丰富的结果图,对以后的井壁结构设计研究具有重要的意义。
     此次,在内蒙古泊江海子矿井全面和深入的开展了白垩系地层冻结法凿井关键技术问题课题,并取得成功,填补了我国白垩系地层冻结基础理论的空白,解决了白垩系地层井壁设计、井壁安全、等一系列重大理论与关键技术问题,完善和丰富了我国冻结法凿井的理论与实践成果,极大的提升了我国冻结法建井的水平,创造了巨大的经济和社会效益。
Cretaceous and Jurassic strata of the Inner Mongolia region, freezing sinking as the research background. Theoretical analysis, field measurement and numerical simulation methods. Force characteristics of double reinforced concrete shaft lining structure in the Cretaceous. The Jurassic strata were studied, sidewall structure optimization program as the basis for fruitful economic and social benefits.
     Experimental study of Cretaceous, Jurassic strata freeze rock physical and mechanical properties. By contrast, in the eastern region and western regions of differences in physical and mechanical properties of frozen soil (stone). By theoretical analysis, the double-layer reinforced concrete shaft lining stress mechanism and the external load values and calculation methods, and discusses the design of the double-layer sidewall structure calculation methods. Field measurement, the Cretaceous strata freezing section to freeze stress and steel stress (vertical and ring), the law of development, the formula of the Cretaceous strata freezing pressure and the measured data combined with theoretical analysis. On this basis, combined with theoretical analysis, the miners parked Jiang Haizi Vice wind three wellbore double reinforced concrete sidewall structure of the optimization program, and by calculation, to prove the feasibility of the optimization program at the same time demonstrate optimization of direct and indirect economic benefits are significant. Finally, numerical simulation, the force characteristics of the Cretaceous formation of double sidewall structure research, has been a large number of numerical simulation results and the results of Figure, right after the sidewall structural design is of great significance.
     The the Jianghai Zi mine in Inner Mongolia, moored a comprehensive and in-depth Cretaceous strata freezing sinking key technical problems in topic and be successful, to fill the gap of Cretaceous strata to freeze the basic theory to solve the sidewall of the Cretaceous strata design, sidewall security, a series of important theories and key technologies, to improve and enrich the theory and practice of China's freezing sinking results, greatly improved the level of freezing method of well construction in China, has created enormous economic and social benefits.
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