四号桥台是位于阿日卡尔峡谷西岸边缘的重力式桥台。
The No. 4 bridge seat is a gravity bridge basement located on the west bank of Ariker canyon.
重力式挡土墙建立在桥台的下游护坡上，墙的基础由桩和筏板构成。
The retaining-wall foundation is built on the downstream bank slope of the bridge abutment, which stability cannot meet the requirement of specification.
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