山区高速铁路高陡边坡稳定性与变形分析

Research of stability and deformation on the high and steep slope of high speed railway in mountainous regions

以某高速铁路高边坡为例,分别计算不同施工阶段滑面为圆弧面和折线面、坡体无水和饱和等各种条件下边坡的稳定性安全系数并分析影响规律。系统地计算施工过程中各种条件影响下坡体水平位移与垂直位移的大小和变化规律。研究结果表明:按现行高速铁路规范设计的边坡,其位移在可接受的范围内,开挖卸荷引起的回弹明显,位移最大值发生在施工最后阶段;地下水对坡体竖向位移值没有明显影响,但会增大水平位移,在地下水变化较大的山区和雨季施工时应引起注意,加强观测和预防措施;锚杆对控制岩质边坡局部位移有一定的作用。研究成果可用于指导该山区高速铁路的边坡设计,可供同类工程设计和施工参考。

The stability safety factor of a high steep railway slope in different construction step was calculated. Two types of potential slope surface （ arc and polygonal） and two conditions of moisture content of the body （ an- hydrous and saturated） were taken into account. Meanwhile, its influencing rule was also analysed. The result shows that the slope is stable in natural condition and different constructional steps. Simultaneously, the horizon- tal and vertical displacement of the railway rock slope was computered during construction. The result shows that the displacement variation of the slope is accepted according to high -speed railway standard for slope design. The vertical displacement resulted from unloading is obvious. The maxium displacement value occurs in the last construction step. Underwater saturated in the slope body makes the horizontal displacement increase and it has no obvious impact on vertical displacement. Therefore, underwater must be noticed in mountainous regions and rainy season construction, including strengthening the observation and precautions. Anchor rod has some effects on the control of local rock slope displacement. The conclusions can be for reference to the similar slope in de- sign and construction.