不规则基坑开挖导致支护结构变形及控制研究  

Study on Deformation and Control of Support Structure Caused by Irregular Foundation Excavation

作　　者：魏焕卫[1] 孙元硕 尚文涛 WEI Huanwei;SUN Yuanshuo;SHANG Wentao(College of Civil Engineering,Shandong Jianzhu University,Jinan,Shandong 250101,China)

机构地区：[1]山东建筑大学土木工程学院,山东济南250101

出　　处：《施工技术（中英文）》2022年第19期1-6,共6页Construction Technology

基　　金：国家自然科学基金(41272281)。

摘　　要：以某不规则深基坑内支撑支护为背景,通过现场监测数据分析不规则土方开挖导致基坑两侧冠梁水平位移以及支护桩深层水平位移的变化规律,并建立PLAXIS 3D有限元模型进行数值模拟,模拟结果与实测结果吻合良好,验证了模型的有效性,并在此模型基础上在荷载较小一侧坡顶施加土体堆载,模拟基坑两侧的桩体深层水平位移与弯矩变化。分析结果表明:在不规则基坑开挖下会产生不对称荷载,荷载较大一侧桩体产生向基坑开挖侧的变形,变形较大,荷载较小一侧桩体产生背离开挖侧的变形,由于在不规则基坑开挖引起的荷载较小侧坡顶施加土体堆载,能够有效减小不规则基坑开挖引起的荷载较大一侧桩体的变形与弯矩。Based on the background of an irregular deep foundation excavation, the irregular earth excavation caused the horizontal displacement of the crown beams on both sides of the foundation excavation and the horizontal displacement of the supporting piles, and the PLAXIS 3 D finite element model was established based on the field monitoring data. Numerical simulations are carried out, and the simulation results are in good agreement with the measured results, which verifies the validity of the model. Based on this model, a soil pile is applied on the top of the slope with a smaller load to simulate the deep horizontal displacement of the piles on both sides of the foundation excavation. And the bending moment changes. The analysis results show that asymmetrical loads will be generated under the excavation of irregular foundation excavation. The pile on the larger load side will deform toward the excavation side of the foundation excavation, and the larger deformation will occur on the side with smaller load. Deformation of the side, due to the small load caused by the excavation of the irregular foundation excavation, the pile of soil is applied to the top of the side slope, which can effectively reduce the deformation and bending moment of the pile on the side with the larger load caused by the excavation of the irregular foundation.

关 键 词：深基坑 支护结构 实测数据 水平位移 不对称荷载 

分 类 号：TU443[建筑科学—岩土工程]