变形量符号如何确定？
（1）水平位移：向下游为正，向左岸为正，反之为负。
（2）船闸闸墙的水平位移：向闸室中心为正，反之为负。
（3）垂直位移：下沉为正，上升为负。倾斜：向下游转动为正，向左岸转动为正，反之为负。
（4）接缝和裂缝开合度：张开为正，闭合为负。
暂无解析
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