山区高速公路岩体边坡稳定性处理技术

Stability Analysis and Processing Technology of Mountain Highway Rock Slope

在分析岩体边坡稳定性的基础上,建立受非均布线形荷载作用的地基力学模型,应用叠加原理推导出岩体表面在上述荷载作用下,预应力锚索-地梁结构中垂直于梁轴线的平面内的地基中深z处的应力和位移计算公式,为研究预应力锚索-地梁结构在岩体中传递规律提供了理论基础.并以湖南省常张高速公路K123＋160-K123＋369边坡为实验区域,现场实验得出在对锚索施加预应力后,锚索预应力通过地梁传递给被加固的岩土体,其传递方式在垂直于地梁轴线的平面内是以梁轴线与该平面的交点为端点的近似橢圆的等值面形式由内向外呈逐渐衰减趋势分布的.藉此证明预应力锚索-地梁结构在山区高速公路岩体边坡中是一种可靠的处理技术.

Based on the analysis of rock slope stability, and the foundation mechanical model of non linear unipoium load was established, the formulas for stress and displacement of depth of z in a foundation were deduced by superposition principle in the plane perpendicular to the axis of the beam in prestressed anchor - Rope and groundsill structure. So the theoretical basis for the force transmission law was provided. This paper used the slope of K123 ＋ 160 - K123 ＋ 369 of Changde - Zhangjiajie Expressway of Hunan Province as experimental region. According to the theoretical analysis, after the anchor cable has been prestressed, the prestress in prestressed cable anchor transfered to the strengthening geotechnical body through ground beam. The transfer mode was decaying gradually from inner to outer in an approximate ellipse iso - surface in the plane perpendicular to the axis of the beam. By the field experiment we can get the result that the compression strain increased with depth, after peak value it decayed gradually to O,this distribution form was in accordance with theoretical conclusions.