地震物探在高速路堑边坡岩体结构研究中的应用

The Application of Seismic Geophysical Prospecting Method in the Research of Slope Structure on Expressway

成都至上海高速公路四川段冯店路堑高边坡高度78.5m,由侏罗系紫红色厚层状泥岩与灰色巨厚层状长石砂岩互层构成。泥岩软弱,砂岩坚硬且发育两组近垂直的陡倾节理,其中一组走向与边坡走向近平行,而另一组与之近垂直。边坡结构及边坡变形现状如何是边坡设计所关心的问题。为此,利用物探方法对边坡岩体结构和边坡变形特征进行了测试,本文根据测试资料对该边坡的结构进行了分析,并与钻孔资料进行了对比分析,结果表明边坡岩体中节理普遍松弛或张开,控制节理发育岩体的继续变形,保持整体稳定是该边坡设计的关键。

Fengdian cutting slope, which is on the Sichuan segment of the expressway from Shanghai to Chengdu, is 78.5m high. The slope consists of mudstone and sandstone. The mudstone is softer and sandstone is harder. There are two sets of joints with high dip angle in the sandstone. One of the joints is parallel, the other is perpendicular to the cutting slope. The structure and deformation of the slope are important to the design of the slope. So the structure of the slope was detected with seismic method, and was analyzed according to the detected data. The results show that most joints in the slope are patulous or loosen. Controlling the continuous open deformation of the joints is the key to the design of the slope.