悬索跨越是油气长输管道跨越河流最常用的形式之一,锚固系统作为悬索跨越结构的重要组成部分主要承受主缆拉力,目前常用的形式有重力式锚固墩和隧道锚两种。本文针对特殊地质地形下的悬索跨越提出了一种新的锚固方式,即预应力锚索-锚固体-桩基础方式,这种锚固方式通过锚固体将主缆拉力传至预应力锚索,然后传至下伏基岩,桩基础则承受锚固体重力,从而避免了大规模开挖岸坡或长距离开挖锚固隧道,为锚固系统设计提供了新的思路。对预应力锚索作用下锚固体和土体的相互作用进行了数值模拟,结果表明锚固体前端下缘应力值较大,土体应力较小,最大应力出现在锚固区,因此锚固区必须位于稳定的基岩上。 Suspension crossing is one of the most commonly used forms of oil and gas long-distance pipeline crossing river. Anchorage system, as an important component of suspension bridge structure, is mainly subjected to the main cable pulling force. At present, gravity anchorage piers and tunnel anchors are commonly used. In this paper, a new type of anchoring method is proposed for the suspension span under the special geological terrain, that is, the prestressed anchorage cable-anchorage-pile foundation mode. This anchoring mode transmits the main cable tension to the prestressed anchorage cable through the anchoring body, And then transferred to the underlying bedrock, the pile foundation is subjected to the gravity of the anchor, thereby avoiding the large-scale excavation of the bank slope or long-distance excavation of the anchoring tunnel, which provides a new idea for the design of the anchoring system. The numerical simulation of the interaction between anchor and soil under the action of prestressed anchor cable shows that the lower edge of the anchor has larger stress, the soil stress is smaller and the maximum stress appears in the anchorage zone. Therefore, the anchorage zone must be located at Stabilized bedrock.