互层胶结土中正断层地震地表破裂位错特征研究

为了解决采用Trimble GX 3D地面激光三维扫描仪分析互层胶结土中正断层地震地表破裂位错特征时,未有效模拟地表垂直和水平位移的基本特征,获取的地表破裂位错特征结果不准确的问题。提出新的互层胶结土中正断层地震地表破裂位错特征研究方法,先构建地震地表弹性位错模型,分析互层胶结土正断层的地表三维断裂特征,得到地表在受到走滑、逆冲和张开错动导致的地表错位变化情况;再通过正断层地震地表破裂离心机试验,获得互层胶结土中正断层地震地表破裂位错特征。试验结果说明,所提方法可有效分析互层胶结土中正断层地震地表破裂位错特征,且破裂点在土体模型中部和中下部的裂缝深度分别为22.4 m和33.4 m,裂缝上的破裂点处于土体模型的中下部时,裂缝的深度越深。

Dislocation Characteristics of Seismic Surface Rupture ofNormal Faults in Interbedded Cemented Soil

The basic characteristics of vertical and horizontal displacements of the ground surface cannot be effectively simulated, and the obtained results of dislocation characteristics of ground rupture are inaccurate, when using a Trimble GX 3D ground laser three-dimensional scanner to analyze the dislocation characteristics of normal faults in interbedded cemented soil. To address this issue, this paper proposes a new method to study the dislocation characteristics of seismic surface fractures of normal faults in interbedded cemented soil. First, the elastic dislocation model of the earthquake surface was constructed, and the three-dimensional fault characteristics of the normal fault in interbedded cemented soil were analyzed to obtain the surface dislocations. Surface rupture dislocation characteristics of normal faults in interbedded cemented soil were then studied through the centrifuge test. The experimental results showed that the proposed method can effectively analyze the dislocation characteristics of the seismic surface fractures of normal faults in interbedded cemented soil. The fracture depth of the fracture point in the middle and lower parts of the soil model were 22.4 m and 33.4 m, respectively. The fracture was deeper with the fracture point in the lower part of the soil model.