龙门水库溢洪道高边坡稳定性研究

On the stability of high spillway slope of Longmen Reservoir on the Huanghe River

龙门水库110m高的溢洪道边坡处于粉细砂岩层并含有泥化夹层的地区。本文考虑了边坡形状、开挖方式及时间等因素,以粘—弹性模型对人工边坡作了分析计算,坡脚处最大压应力和剪应力分别为8.7MPa和3.0MPa,坡顶及马道附近为拉应力区,最大拉应力1.2MPa,均在安全值以内。泥化夹层形成应力集中带,剪应力小于岩石抗剪强度。但从长远看,泥化夹层的存在是边坡不稳定的潜在因素。

The high spillway slope of Longmen Reservoir. with a height of 100 meters, is consisted of silty-fine sandstone which contains clay intercalations. After considering the factors influencing the stability of the slope, for example, the shape of the slope, excavation methods and time etc. the stress-strain of the artificial slope has been calculated with a visco-elasticity model. The result calculated shows that the maximum compressive stress at slope toe is 8. 7 MPa and the shear stress is 3. 0 MPa; both the vinicities of slope top and packway, being in tensile zones with the maximum tensile stress of 1. 2 MPa, are within the range of value of safity; the stress-concentrated zones were formed due to clay intercalations and its shear stress is less than shear strength of rock. But the clay intercalations existing within the high slope is a potential factor affecting the stability of the slope in the future.