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进口边坡为斜向结构,一、二期开挖底线均在强松动岩体下限以上,主要破坏形式为圆弧面滑动,故只需按圆弧破坏面寻找最危险滑弧,并求出稳定系数。对三期及四期开挖,除可能在强松动岩体内发生圆弧面滑动破坏外,边坡还可能沿层面、层间挤压带或裂隙面发生平面滑动破坏,计算时先按圆弧面滑动破坏在三期和四期的开挖范围内找出最危险滑弧,并结合实际裂隙面的位置,确定出三期、四期开挖的直线和折线滑动破坏面,再对同一滑面取不同的强度参数(层面参数和岩体参数)分别计算出相应的稳定系数。
The imported slope is inclined structure. The first and second excavation bottoms are all above the lower limit of strong loose rock mass, and the main failure mode is sliding on the arc surface. Therefore, only the arc rupture surface is needed to find the most dangerous slippery arc and find Stability factor. Excavation of the third and fourth phases may occur in addition to the sliding and failure of the arc surface in the strongly loose rock body. The slope may also be subject to plane sliding failure along the layer plane and the interlayer extrusion zone or fracture plane. When calculating, Arc slip damage in the three and four excavation range to find the most dangerous slippery arc, combined with the actual position of the fracture surface, to determine the three and four excavation of the straight line and polyline sliding failure surface, and then the same The sliding surface to take different intensity parameters (layer parameters and rock parameters) were calculated corresponding stability factor.