蓄能电站深斜孔帷幕加固技术研究

发布时间：2018-06-01 17:23

本文选题：深斜孔 + 帷幕灌浆　；参考：《南昌工程学院》2017年硕士论文

【摘要】：本文以广东省某斜直孔帷幕灌浆工程为研究背景,主要研究了如何提高深斜直孔帷幕灌浆质量。针对该问题从斜直钻孔轨迹偏斜及帷幕灌浆参数展开研究,进而提出一些相关建议。在斜直钻孔轨迹偏斜的研究中,该文主要采用了有限元分析法,对钻柱与背景工程坝基基岩相互作用方式进行了数值模拟,对比分析倾斜角度、轴向钻压对钻孔轨迹偏斜的影响,同时也利用了解析法对钻柱临界屈曲值进行公式推导求解,验证数值模拟的准确性。通过上述研究分析,针对钻孔偏斜机理,提出了刚性满眼钻具组合防斜技术。深斜直孔帷幕灌浆参数的优化,主要采用了离散单元法编写程序对基岩注浆过程进行了数值模拟,研究了不同灌浆压力,岩体裂隙中压力扩散规律与浆液扩散规律。同时结合浆液扩散半径经验公式以及帷幕灌浆试验对比验证数值模拟的准确性,得到最优的浆液扩散有效半径。通过上述对斜钻孔偏斜与帷幕灌浆参数的研究分析,成功地应用于广东省某斜直孔帷幕灌浆工程,对今后类似帷幕灌浆防渗工程的设计与施工具有一定的实际指导意义。
[Abstract]:Based on the research background of a slanting straight hole curtain grouting project in Guangdong Province, this paper mainly studies how to improve the grouting quality of deep inclined straight hole curtain. In view of this problem, the skew of inclined straight borehole trajectory and curtain grouting parameters are studied, and some related suggestions are put forward. In the research of skew straight borehole trajectory, the finite element analysis method is used to simulate the interaction between drill string and foundation rock in background engineering, and to compare and analyze the inclination angle. The influence of axial drilling pressure on the deflection of borehole trajectory and the derivation of the critical buckling value of drill string by analytic method are also used to verify the accuracy of the numerical simulation. According to the mechanism of borehole deflection, this paper puts forward the technology of anti-deviation of rigid full hole drilling tool. In order to optimize the grouting parameters of deep inclined straight hole curtain, the numerical simulation of grouting process of bedrock is carried out by means of discrete element method, and the law of pressure diffusion and slurry diffusion in cracks of rock mass under different grouting pressures are studied. At the same time, combined with empirical formula of slurry diffusion radius and curtain grouting test to verify the accuracy of numerical simulation, the optimal effective radius of slurry diffusion is obtained. Based on the above research and analysis on the parameters of oblique borehole deflection and curtain grouting, it has been successfully applied to a slanting straight hole curtain grouting project in Guangdong Province, which has certain practical guiding significance for the design and construction of similar curtain grouting anti-seepage engineering in the future.
【学位授予单位】：南昌工程学院
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TV543.5

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