铁路客运专线地质勘察问题探讨

Exploration on the Geological Investigation Problems of the Passenger Dedicated Railway Line

研究目的:随着客运专线技术标准的提高,要求更深入地研究地基变形问题,加强地质勘察工作,不断提高地质勘察水平。研究方法:从客运专线与Ⅰ级铁路的技术标准出发,分析研究客运专线的变形要求和地质勘察的特点,论述提高地质勘察精度的必要性和采空区岩体移动角的取值,并讨论松软土的定名。研究结果:在Ⅰ级铁路地质勘察要求的基础上,客运专线地质勘察应加深加密勘探孔,做好综合分析和沉降观测,针对采空区岩层移动角的选择提出了新认识,分析了定名松软土的不利因素。研究结论:客运专线技术标准的提高,需要认真考虑地基土的变形问题,应充分分析区域地质条件,重视现场沉降观测。客运专线的采空区岩层移动角应选用更小的角度或者比较安全的边界角;对于土体分类不应增加松软土的定名。

Research purposes： Along with the raising of technique standard for passenger dedicated railway line, deep researching the problem of foundation soil deformation, enhancing geological investigation work and improving the level of investigation are required. Research methods：Based on the geological investigation standards for passenger dedicated railway line and I level railway, this paper analyses the distortion requirement and characteristics of geological investigation for passenger dedicated railway line, and discusses the necessity of improving the geological investigation precision, taking the angle of critical deformation and naming of the running soil. Research results：Based on the requirement of geological investigation for I level railway, the number of boreholes for investigation of passenger dedicated railway line should be increased and the depth of borehole should be deepened. The comprehensive analysis and settlement observation are also being required. This paper brings forward the new understandings about the depth of geological investigation for passenger dedicated railway line and the selection of angle of critical deformation for the goaf, and analyses the disadvantage factors of naming of the running soil. Research conclusions： With the improvement of technique standard for passenger dedicated railway line, the foundation soll deformation needs to be considered seriously. The condition of regional geology should be fully analyzed. The settlement observation on site should be regarded. The angle of critical deformation of goaf for passenger dedicated railway line should be boundary angle. The running soil should not be a type of soil in the soil classification system.