REAEARCH ON THE MECHANISM OF THE INFLUENCE OF DYNAMIC LOAD OF HIGH-SPEED TRAIN ON LAND SUBSIDENCE SUBJECTED TO FAULT EFFECT: A CASE STUDY OF THE HUAILAI SECTION OF THE BEIJING-ZHANGJIAKOU HIGH-SPEED RAILWAY
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摘要: 京张高铁怀来段位于怀涿、延矾盆地复合部位，盆地内土体工程地质特性的差异及隐伏断裂稳滑活动产生的地面沉降无疑会威胁京张高铁的安全运行。依据工程地质钻孔及地球物理探测资料，构建跨活动断层地基土体二维地层结构模型，通过数值模拟手段开展考虑断层效应的高铁列车动载荷对地面沉降的影响机理研究。研究表明：列车动荷载主要影响50 m深度范围内的土体，随车速增加动荷载造成的土体竖向位移降低，随车重增加竖向位移增加；在列车动荷载和断层滑移双重作用下，随深度增加，土体竖向位移以受列车动荷载影响为主转为以断层滑移影响为主，50 m以下土体竖向位移全部由断层滑移所致，且紧邻断层两侧距离相同位置上盘土体竖向位移大于下盘。Abstract: The Huailai section of Beijing-Zhangjiakou (BZ) high-speed railway is located in the compound position of the Huaizhuo basin and Yanfan basin. The ground subsidence resulted from the difference of engineering geological characteristics of soil and sliding of buried faults in the basin will undoubtedly threaten the safe operation of BZ high-speed railway. Using numerical simulation to study the mechanism of the influence of dynamic load of high-speed train on land subsidence subjected to fault effect, the 2D geological model of soils in the Huailai section of BZ high-speed railway is established based on the field data of engineering geological boreholes and geophysical exploration in this study. The results indicate that the dynamic load of the train mainly affects the soil within the depth of 50m, with increasing displacements accompanying decreasing train velocities and increasing train mass. Under both the dynamic train load and fault slip, the settlement of the soil mainly affected by the dynamic train load tends to be mainly controlled by the fault slip as the depth increases. And the settlement of the soil below 50m is controlled by the fault slip. What's more, the settlement of soil around the fault in the hanging wall is larger than that in the footwall at the same distance from the fault.
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表 1 断层F4标志性地层
Table 1. Characteristics of marked strata of the fault
标志性地层 上盘厚度/m 下盘厚度/m 断距/m 中更新统地层 40 25 68 下更新统地层 169 73 82 新近系地层 155 57 178 
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表 2 各层土体采用的计算参数
Table 2. Calculation parameters using by each layer of soil
地层序号 土层类型 厚度/m 弹性模量/MPa 泊松比 密度/(kg/m3) 粘聚力/kPa 摩擦角/(°) ① 粉土 上盘:5
下盘:1515 0.30 1750 16 28 ② 砾石 上盘a:40;10;30
下盘:540 0.18 2000 10 45 ③ 中粗砂 下盘:10 25 0.22 1800 20 34 ④ 粘土 上盘:40
下盘:3020 0.25 1940 99 27 ⑤ 粉土 上盘:5 15 0.30 1960 30 33 ⑥ 粘土 上盘:10 18 0.27 2000 40 25 ⑦ 有机质粘土 上盘:60
下盘:7020 0.25 2000 106 28 ⑧ 粉质粘土 下盘:70 30 0.2 2100 125 27 断层 / 1.5 0.30 1500 / / 注：a表示②砾石层在上盘有三层，由上而下土层厚度分别为40 m、10 m、30 m
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