长春市某12m深基坑采用排桩锚杆支护结构,因土压力分析有误,支护结构设计不合理,导致基坑大部分开挖到基底后,排桩结构水平位移超过允许范围,桩间土大面积掉落,基坑外地面出现地裂缝,由槽钢组成的腰梁扭曲变形,桩顶冠梁向基坑内变形明显,并出现裂缝。由于施工单位及时采取回填反压措施,才控制住支护结构的变形。然后,通过进一步的理论分析,并对原支护结构增加一排锚杆后,基坑开挖才得以顺利进行。 Changchun City, a 12m deep foundation pit with piles anchor support structure, due to incorrect earth pressure analysis, support structure design is not reasonable, resulting in excavation of the foundation pit most of the foundation, the pile displacement horizontal displacement exceeds the allowable range, Large area of ​​soil between the piles dropped. Ground fissures appeared on the ground outside the foundation pit. The waist beam composed of channel steel was distorted and deformed. As the construction unit to take backfill back pressure in time to control the deformation of the support structure. Then, after further theoretical analysis and adding a row of anchor bolts to the original supporting structure, the excavation of the foundation pit can be carried out smoothly.