位错理论模型在福建省沿海交通干线地面沉降模拟中的应用

Application of computed subsidence in Fujian coastal traffic area using dislocation model

为了研究活动断裂对福建省东南沿海交通干线基础稳定性的影响,采用位错理论模型,对福建省长乐-南澳断裂带三维活动性进行模拟计算,分析了交通网络覆盖区域的地壳形变场分布特征.结果表明:受长乐-南澳断裂带影响,研究区域整体表现为近北东向的缓慢抬升,平均速率为1 mm/a.在与北西走向的九龙江下游断裂的交汇部位,地壳差异性活动显著增强,呈现出下沉-抬升梯度带相互切割的形变趋势.同时,研究区域地应变分布也表现为扩张-压缩交替带,地壳引张最剧烈的区域位于同一断裂交汇处,应变率为2.90×10-8/a.由此可知,长乐-南澳断裂与九龙江下游断裂的交汇部位对研究区域地球动力学基础稳定性影响最为显著.

In order to explore the impact on the stability of the traffic network by active faults, the three-dimensional sliding of the Chang＇le-Nan＇ao fault zone which is located along the southeast coast of Fujian Province is calculated based on the theory of the dislocation model, and the analysis