Study on Surface Subsidence Law and Control Measures in Large Section Rectangular Pipe Jacking Method in Complex Environment
-
摘要: 为了研究邕江北岸Ⅱ级阶地地区浅埋大断面(6.9 m×4.9 m)矩形顶管在复杂环境下长距离掘进过程中的地表沉降规律及控制措施,依托南宁地铁1号线金湖广场站Ⅲ号出入口工程,采用三维有限差分软件FLAC3D模拟顶管施工过程,并与实际监测结果作对比验证,结果表明:①在顶进过程中顶管机前方土体的主要扰动范围为两倍洞宽;②地表横向沉降曲线以顶管轴线为中心呈正态分布,地表沉降的横向影响范围为三倍洞宽;③通过顶管机头上抬、加设注浆套板、管节减摩注浆以及合理的顶进参数,确保地表隆起和沉降量均在合理控制的范围内。Abstract: In order to study regularity and control measures of surface settlement during shallow large cross-section(6.9 m×4.9 m) rectangular pipe-jacking construction in the north second terrace area of Yongjiang river.The paper based on No.3 exit project of Jinhuguangchang station on Line 1 of Nanning Metro,three-dimensional model is set up by finite difference software FLAC3D to simulate pipe jacking construction process,and compared with actual monitoring results.Conclusions are drawn as follows:①the main disturbance range of soil in front of Pipe jacking machine is about 2 times of the tunnel width;②the surface transverse settlement curve presents normal distribution as the center of pipe axis,the impact range of surface transverse settlementis about 3 times of the tunnel width;③in order to ensure that the surface uplift and settlement are within the range of reasonable control through the pipe jacking head up slightly,add grouting sleeve plate,pipe section antifriction slip casting and reasonable jacking parameters.
-
计量
- 文章访问数: 132
- HTML全文浏览量: 19
- PDF下载量: 26
- 被引次数: 0
下载:
