三峡船闸高边坡及中隔墩变形影响因素分析

Analysis of influence factors on deformation of high slope and central pier of TGP permanent shiplock

通过数值模拟计算,分析了初始地应力、岩体卸荷弱化效应、锚索加固和地下水等因素对三峡永久船闸高边坡变形的影响及中隔墩异常变形机理.研究表明:初始地应力是影响两侧高边坡变形的控制性因素,岩体卸荷弱化效应对边坡变形也有重要影响,锚索对节理裂隙面变形有较大的限制作用,地下水对变形的影响不明显;中隔墩三面临空,卸荷充分,节理裂隙扩展引起的各向异性变形以及初始地应力引起的不对称变形是中隔墩整体向北变形的主要原因,而开挖次序不是其主要原因.

Based on numerical simulation, the effects of initial geo-stress, unloading induced-rock mass deterioration, anchor cable reinforcement technique, and groundwater on the deformation of the high slope as well as the mechanism of abnormal deformation of the central pier of TGP permanent shiplock were analyzed. Some conclusions were drawn： the initial geo-stress is the key factor influencing the high slope deformation at two sides; the rock mass deterioration is another important factor; anchor cables have significant influences on restraining deformation of cracks and joints; while groundwater is of little influence on the deformation of the high slope. In consideration of the fact that the central pier has three free surfaces, the stress in the central pier can be completely released, and the anisotropy deformation induced by crack and joint development and the asymmetric deformation of central pier induced by initial geo-stress are the main factors causing the north-toward abnormal deformation of the pier, while the excavation sequence is not the main reason for the abnormal deformation.