近接建筑荷载作用下阳角型深基坑最佳支撑位置  

Optimal strut position of deep foundation pit with convex corner under surcharge of adjacent building

作　　者：陈保国[1] 贾曾潘 CHEN Bao-guo;JIA Zeng-pan(Faculty of Engineering,China University of Geosciences,Wuhan,Hubei 430074,China)

机构地区：[1]中国地质大学(武汉)工程学院,湖北武汉430074

出　　处：《岩土力学》2023年第8期2400-2408,共9页Rock and Soil Mechanics

基　　金：国家自然科学基金(No.52178370);中国水利水电第七工程局有限公司科研基金(No.STT-SJQ-SG0022020-KY-001)

摘　　要：近接荷载作用下基坑阳角区的受力机制复杂,因此,研究支撑位置变化对基坑阳角区的影响具有重要意义。采用现场监测和数值模拟方法研究了支撑位置变化下基坑阳角区的受力特性和变形规律,主要包括内支撑轴力、桩身侧向土压力、支护桩水平位移、近接建筑沉降和支护桩弯矩等。研究结果表明,支撑位置深度太大或太小均对基坑支护系统的受力和协调变形规律不利,最佳支撑位置的深度在基坑深度的0.33~0.50倍之间(支护桩深度的0.10~0.33倍)。Since the mechanical behavior of the convex corner is complex due to surcharge near the excavation,it is of great importance to evaluate the influence of changes in strut position on the convex corner.Field monitoring and numerical simulations were used to analyze the influence law of the changes of strut position on the deformation and stress characteristics of the convex corner area.The axial force of inner strut,the lateral earth pressure on the pile,the horizontal displacement of the pile,the settlement of adjacent building and the bending moment of the pile were obtained.The research results show that the depth of strut position that is too high or too low is unfavorable to the coordinated deformation and the force of the retaining system.In contrast,the optimal strut position in this analysis is between 0.33 and 0.50 times the depth of the excavation(0.10–0.33 times the depth of the pile).

关 键 词：深基坑 阳角 支撑位置 附加荷载 

分 类 号：TU473[建筑科学—结构工程]