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1.工程概况洛阳至南阳南高速公路分水岭至南阳段第17合同段,起迄里程K64+000～K70+135,全长5.735公里。设计标准为双向六车道,路基设计宽度28m。K69+410～K69+780段边坡为深挖路堑,最大挖深为28米,且坡面多为中风化～弱风化岩,岩体多为块状结构,存在边坡失稳的隐患。经现场勘察,变更设计采用预应力锚索格室防护,锚索采用6根钢绞线组成。一级台阶锚索长度为18米,倾角为25°,二级台阶、三级台阶锚索长度为20米,倾角为20°。格室内采用挂网客土喷播。
1. Project Overview Luoyang to Nanyang South Expressway Nanyang section of the watershed to the first 17 contract section, starting mileage K64 + 000 ~ K70 +135, a total length of 5.735 km. Design standards for two-way six-lane, roadbed design width of 28m. The slope of K69 + 410 ~ K69 + 780 is deep cutting and cutting, the maximum excavation depth is 28 meters, and the slope is mostly weathered to weakly weathered rock. Most of the rock mass is block-like structure, and there is a hidden danger of slope instability. After the site survey, the design of change adopts prestressed anchor cable cell protection, anchor cable is composed of 6 strand. The length of a first-level step anchor cable is 18 meters, the inclination angle is 25 °, the second-level step, the third-step step length is 20 meters, and the dip angle is 20 °. Grid indoor use netting earth sowing.