单选题:当基坑开挖较浅.尚未设支撑时,维护墙体的水平变形表现为(  ) 。

题目内容:
当基坑开挖较浅.尚未设支撑时,维护墙体的水平变形表现为(  ) 。 A.墙顶位移最大,向基坑方向水平位移
B.墙顶位移最小,向基坑方向水平位移,呈三角形分布
C.墙顶位移最大,向基坑外方向水平位移
D.墙顶位移最小,向基坑外方向水平位移,呈三角形分布

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