论文部分内容阅读
研究目的:郑西铁路客运专线沿线的黄土广泛分布,湿陷性黄土区段占全线总长度的65%,湿陷程度从轻微(Ⅰ级)到严重(Ⅳ级),涵盖了我国湿陷性黄土的全部类型。在这样复杂的工程地质地段修建高速铁路,具有极大的不确定性和挑战性。因此,郑西铁路客运专线开工建设前期,根据沿线黄土丘陵、伊河和洛河二级阶地、黄土塬、黄河二级阶地、渭河二级阶地等不同地貌单元特点,选择典型的试坑浸水试验场地,在充分浸水条件下,查明湿陷性黄土在大面积浸水条件下的影响范围,并为地基处理和防排水设计提供试验资料。研究结论:通过试验研究表明:8个现场浸水试验场地完全浸水后的浸润线斜率在1.3～6.0之间;试坑外15 mm湿陷变形量发生位置距浸水试坑边的水平距离自东向西逐渐增大,为6～15 m;防排水措施距路肩的水平距离为0.2～0.5倍的湿陷性黄土层厚度,设计深度在DK233～DK250段、DK250～DK321段和DK321～DK356段分别为0.32H-1.60a、1.53H-3.40a、0.88H-1.75a。
Research purposes: The loess along the Zheng-Xi Railway Passenger Dedicated Line is widely distributed. The collapsible loess section accounts for 65% of the total length of the line, and the degree of wetting is slight (Grade Ⅰ) to severe (Grade Ⅳ), covering China’s collapsible All types of loess. The construction of high-speed railway in such a complex engineering geological area is of great uncertainty and challenge. Therefore, according to the features of different topographic units such as the Loess Plateau, the Loess Plateau, the Loess Plateau, the Yellow River second terrace and the Weihe River second terrace, the typical test pit immersion test site Under full immersion conditions, the influence range of collapsible loess under large flooding conditions was ascertained, and experimental data were provided for foundation treatment and drainage design. Research conclusions: The experimental results show that the slope of the infiltration line after immersion in the eight on-site immersion test sites is between 1.3 and 6.0. The horizontal distance of 15 mm from the test pit to the edge of the pit is from east West is gradually increased to 6 ~ 15 m; the horizontal distance between the drainage measures and the shoulder is 0.2 ~ 0.5 times the collapsible loess thickness, the design depth is between DK233 ~ DK250, DK250 ~ DK321 and DK321 ~ DK356 0.32H-1.60a, 1.53H-3.40a, 0.88H-1.75a.