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0引言当需要观测某一特定方向(譬如垂直于基坑围护体系)的位移时,经常采用视准线法、测小角法等观测方法。但当变形体附近难以找到合适的工作基点或需同时观测变形体两个方向位移时,则一般采
0 INTRODUCTION When the need to observe the displacement of a particular direction (such as perpendicular to the foundation pit containment system), the sight line method, small angle measurement method and other observation methods are often used. However, when it is difficult to find a suitable working base point near the deformation body or to simultaneously observe the displacement in both directions of the deformation body, it is generally adopted.