明渠建设与运营对塔基水平承载能力的影响

The Influence of Diversion Channel Construction and Operation on the Horizontal Bearing Capacity of Tower Foundation

针对导流明渠建设将影响周边建筑稳定性的问题,采用数值模拟的方法,在导流明渠建设以及后期运营的过程中,分析了某枢纽工程及其附近输电塔的水平承载能力。案例表明:在导流明渠建设及运营过程中,副坝自重荷载和蓄水后水荷载引起地层压缩沉降,导致副坝靠近塔基一侧发生水平变形,并推动塔基向远离副坝的方向变形,变形增量为-4.81 mm,由于塔基在原设计荷载下水平变形约-4.8 mm,所以导流明渠通水后,塔基最终的水平变形量-9.61 mm。该数值略大不符合规范要求,因此在副坝下方修建一个加固区,加固后水平变形增量减小到-0.7 mm,最终塔基水平变形量为-5.5 mm,满足规范要求,在保证塔基础的稳定的同时,工程能够顺利开展。

Aiming at the problem that the construction of the diversion channel will affect the stability of surrounding buildings, numerical simulation is used to analyze the horizontal bearing capacity of a hub project and its nearby transmission towers during the construction of the diversion channel and subsequent operations. The case shows that during the construction and operation of the diversion channel, the self weight load of the auxiliary dam and the water load after impoundment caused the formation to compress and settle, which caused the horizontal deformation of the side of the auxiliary dam close to the tower foundation, and pushed the tower foundation to deform away from the auxiliary dam, when deformation increment is-4.81 mm. Due to the fact that the horizontal deformation of the tower foundation is about-4.8 mm under the original design load, the final horizontal deformation of the tower foundation is-9.61 mm after the diversion channel is filled with water. This value is slightly larger and does not meet the requirements of the specification, so a reinforcement area is built under the auxiliary dam. After reinforcement, the horizontal deformation increment is reduced to-0.7 mm, and the final horizontal deformation of the tower foundation is-5.5 mm, which meets the specification requirements. While ensuring the stability of the tower foundation, the project can be carried out smoothly.