题目内容

当桥台台后填土在地震力作用下因土压力变化，危及桥台安全时，不能采取下列措施：

A. 在台背增设挡墙或桥孔，新挡墙或新桥孔的桥台应能单独承受填土主压力
B. 在台前修筑扶壁或斜撑，扶壁和斜撑与原桥台共同承受主压力
C. 将埋置式或一字式桥台改为U形桥台
D. 桥台受压侧加筑围裙的方法

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