超深圆形基坑施工期监测数据分析与研究

Analysis and Research of Monitoring Data during Construction of Ultra-deep Circular Foundation Excavation

以某圆形深基坑围护结构为对象,通过现场实测数据与理论计算值的比对,对连续墙内力及变形规律进行了分析研究。结果表明:采用地下连续墙+内衬墙支护方式能很好抵抗连续墙侧向变形,墙体深层水平位移较小,变形主要发生在深层土体开挖阶段;连续墙内力及位移大小与开挖速度、内衬施工速度等因素有关;理论计算值与实测结果大致吻合,但由于围护结构受力与变形的复杂性,使得两者仍存在一定的差异。

Taking a circular deep foundation excavation retaining structure as the object,the internal force and deformation law of continuous wall are analyzed and studied by comparing the field measured data with the theoretical calculation value. The results show that:the diaphragm wall + lining wall support method can well resist the lateral deformation of diaphragm wall, the deep horizontal displacement of the wall is small, and the deformation mainly occurs in the deep soil excavation stage;the internal force and displacement of diaphragm wall are related to the excavation speed and lining construction speed;the theoretical calculation value is roughly consistent with the measured results. There are still some differences between them because of the complex stress and deformation of the retaining structure.