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目前常用的弹性抗力法在计算基坑开挖引起的变形时,只能考虑围护桩(墙)在土压力作用下产生的变形,没有反映软土中深基坑开挖的坑底隆起变形及其引起的围护桩(墙)变形和坑外土体沉降。已有的实测结果表明,软土桩深基坑开挖产生的坑底隆起变形及其引起的支护结构和土体的附加变形较为显著,因此,软土中的深开挖引起的隆起变形及其工程效应不容忽视,并应采取针对性措施予以控制。
At present, the commonly used elastic resistance method can only consider the deformation of the retaining pile (wall) under the earth pressure when calculating the deformation caused by the excavation of the foundation pit, and does not reflect the deformation of the bottom of the pit during excavation of deep foundation pit in soft soil And the deformation of the retaining pile (wall) and the settlement of soil outside the pit. The existing measured results show that the deformation of the pit bottom and the additional deformation of the supporting structure and soil caused by excavation of deep foundation pit of soft soil pile are more significant. Therefore, the deformation caused by deep excavation in soft soil Its engineering effects can not be ignored and should be controlled by specific measures.