某明挖深基坑地下连续墙非对称配筋优化设计  

Optimal design of asymmetrical reinforcement for diaphragm wall in a deep foundation pit

作　　者：曹成威 石钰锋[1] 徐长节[1] 侯世磊 龚宏华 纪松岩 CAO Chengwei;SHI Yufeng;XU Changjie;HOU Shilei;GONG Honghua;JI Songyan(Jiangxi Key Laboratory of Geotechnical Infrastructure Safety and Control,East China Jiaotong University,Nanchang 330013,Jiangxi,China;China Railway 14th Bureau Group Co.,Ltd.,Jinan 250101,Shandong,China;Jiangxi Local Railway Development Co.,Ltd.,Nanchang 330001,Jiangxi,China;China Railway Construction Bridge Engineering Bureau Group 1st Engineering Co.,Ltd.,Dalian 116033,Liaoning,China)

机构地区：[1]华东交通大学江西省岩土工程基础设施安全与控制重点实验室,江西南昌330013 [2]中铁十四局集团有限公司,山东济南250101 [3]江西地方铁路开发有限公司,江西南昌330001 [4]中铁建大桥工程局集团第一工程有限公司,辽宁大连116033

出　　处：《隧道与地下工程灾害防治》2022年第1期63-70,共8页Hazard Control in Tunnelling and Underground Engineering

基　　金：江西省重点基金资助项目(20202ACB202005);南昌轨道交通集团科研资助项目(2019HGKYB002);江西省自然科学基金重点资助项目(20192ACB20001)。

摘　　要：依托南昌市艾溪湖明挖地铁基坑工程,通过ABAQUS软件对该基坑开挖进行数值模拟,对比地连墙水平位移、支撑轴力、地表沉降数值计算和现场监测结果,验证数值模型的可靠性和适用性,重点分析开挖过程中地连墙弯矩变化规律。研究表明:地连墙迎土侧和开挖侧弯矩存在显著差异,开挖侧整体受拉,迎土侧整体受压,开挖侧最大弯矩为迎土侧的2.3倍,原设计方案中地连墙两侧主筋采用对称配筋,设计方案存在较大优化空间;单纯提高配筋量,裂缝控制效果并不佳;在开挖深度和内支撑间距不变条件下,对现有设计进行非对称配筋优化后,迎土侧和开挖侧配筋量分别减少38.3%、11.4%,且结构分担荷载特性更合理,可以较大程度降低钢筋使用量,以减少工程投资和建设规模。Relying on the open excavation subway foundation pit project of Aixihu in Nanchang, the excavation of the foundation pit was numerically simulated by ABAQUS software. The reliability and applicability of the numerical model were verified by comparing the numerical calculation and field monitoring results of the horizontal displacement of the diaphragm wall, supported axial force, surface settlement. The bending moment variation law of diaphragm wall during excavation was analyzed. The research showed that there was a significant difference in the bending moment between the earth facing side and the excavation side of the diaphragm wall, the excavation side was tensioned as a whole and the earth facing side was compressed as a whole. The maximum bending moment of the excavation side was 2.3 times than that of the earth facing side. In the original design scheme, the main reinforcement on both sides of the diaphragm wall was symmetrically reinforced, and there was a large optimization space in the design scheme;the effect of crack control was not good only by increasing the amount of reinforcement. Under the condition of constant excavation depth and internal support spacing, after the asymmetric reinforcement optimization of the existing design, the reinforcement amount on the earth facing side and excavation side was reduced by 38.3% and 11.4% respectively, and the load sharing characteristics of the structure were more reasonable, which could greatly reduce the use of reinforcement, so as to reduce the project investment and construction scale.

关 键 词：基坑工程 地下连续墙 数值模拟 受力变形 非对称配筋 

分 类 号：U459.3[建筑科学—桥梁与隧道工程]