城市快速路小间距并行高铁深塘跨越技术

以小间距并行京沪高铁的苏州中环城市快速路深塘跨越段为研究对象,利用数值方法从京沪高铁桥梁墩台水平位移、沉降、桩身轴力及桩侧摩阻力等四方面分析了传统高填方路基填筑及运营对京沪高铁带来的影响。研究表明:高填方路基引起的地层扰动引起的京沪高铁水平位移远远超过限值,会对其高架桥造成较为严重的破坏。提出了采用“预应力混凝土空心板梁,先简支后连续桥面、重力式桥台、钻孔灌注桩基础、墩高4 m”的矮桥深塘跨越技术。数值模拟分析可知,该技术对京沪高铁扰动极小,结合施工过程中的监控量测,验证了矮桥深塘跨越技术的可靠性。

The technology of spanning deep pond of the urban expressway nearby paralleling high-speed railway

A deep pond section of a city expressway with small interval parallel to the Beijing-Shanghai High-Speed Railway was taken as engineering background. The impact of traditional high embankment on the Beijing-Shanghai High-Speed Railway was analyzed by numerical method from the following four aspects: horizontal displacement and settlement of bridge piers, axial force and skin friction of piles. The results indicated that horizontal displacement of the Beijing-Shanghai High-speed Railway caused by high embankment was far more than the limit, which would cause serious damage to its viaduct. So a spanning technology using low bridges was put forward, which included pre-stressed concrete slab beam, continuous bridge deck erected as simple-supported, gravity abutment, bored pile foundation and 4 m pier. Displacement caused by the low bridge was far less than the limit value. This technology would not affect the normal operation of the Beijing-Shanghai High-speed Railway. Subsequent monitoring results also showed that the low bridge was a reliable technology to spanning deep pond with small interval paralleling to high-speed railway.