某商业综合体地下室深基坑桩锚支护设计优化分析

Optimization Analysis of Pile-Anchor Support Design for Deep Foundation Pit of a Commercial Complex Basement

深基坑工程是危大工程中的重要领域,其工程难度大、危险性高。通过合理的基坑支护设计优化,可以在保证质量和安全的前提下节约成本。以某商业综合体地下室的基坑支护设计为案例,支护设计方案采用桩锚支护形式。通过钢板桩间距、锚杆间距、锚杆倾角和锚杆长度设计参数的变化,分析桩锚支护结构的内力变形、嵌固稳定性以及锚杆抗拔极限承载力的影响。结果分析表明,4#桩的锚杆间距在2m、6#桩的间距在2.1m较为合理;在淤泥层较厚情况下,锚杆倾角在30°~35°较为合理;在此倾角下,锚杆长度约26m。通过优化设计参数,可以达到安全、经济、可靠的设计目标,为类似的深基坑设计提供参考。

Deep foundation pit engineering is an important field in hazardous projects,which is difficult and risky.By optimizing the design of reasonable foundation pit support,it can save costs while ensuring quality and safety.Taking the foundation pit support design of a commercial complex basement as an example,the support design scheme adopts the form of pile anchor support structure.By changing the design parameters of steel sheet pile spacing,anchor rod spacing,anchor rod inclination angle,and anchor rod length,this study analyzes the influence of internal force deformation,embedded stability,and ultimate bearing capacity of anchor rods on pile anchor support structures.The result shows that it is more reasonable when the bolt spacing of 4#steel sheet pile is 2m,and the spacing of 6#steel sheet pile is 2.1m.In the case of thick silt layer,the tilt angle of bolt is more reasonable at 30°~35°.In this inclination range,the length of the bolt is about 26m.By optimizing the design parameters,the design objectives of safety,economy and reliability can be achieved.It provides reference for similar deep foundation pit design.