基于改进Richards法的港珠澳大桥沉管隧道沉降预测研究  

Prediction of settlement of immersed tunnel for Hongkong-ZhuhaiMacao Bridge based on improved Richards method

作　　者：张雨雷 孔令臣 刘思国 李雨润[5] 纪文利 ZHANG Yu-lei;KONG Ling-chen;LIU Si-guo;LI Yu-run;JI Wen-li(CCCC First Harbour Engineering Co.,Ltd.,Tianjin 300461,China;Tianjin Port Engineering Institute Co.,Ltd.of CCCC First Harbour Engineering Co.,Ltd.,Tianjin 300222,China;Tianjin Key Laboratory of Underwater Tunnel Construction and Operation and Maintenance Technology Enterprise,Tianjin 300461,China;CCCC Tianjin Harbor Engineering Design Institute Co.,Ltd.,Tianjin 300461,China;College of Civil Engineering and Transportation,Hebei University of Technology,Tianjin 300401,China)

机构地区：[1]中交第一航务工程局有限公司,天津300461 [2]中交天津港湾工程研究院有限公司,天津300222 [3]天津市水下隧道建设与运维技术企业重点实验室,天津300461 [4]中交天津港湾工程设计院有限公司,天津300461 [5]河北工业大学土木与交通学院,天津300401

出　　处：《中国港湾建设》2023年第1期7-12,共6页China Harbour Engineering

基　　金：国家自然科学基金项目(51008110)。

摘　　要：沉降预测一直是岩土工程研究的热点问题,沉管隧道因其特殊的工程特点,尚无明确的预测模型。基于港珠澳大桥沉管隧道实测的工后沉降数据,分析7种常见预测模型的适用性。研究过程中发现对于管顶回淤量小的管节,星野法和Richards法表现较好;但对于管顶回淤量较大的管节,由于6种模型均无法考虑回淤影响,预测值有较大的偏差,通过GA+BP神经网络中加入回淤变量,预测效果仍不理想。基于上述情况,通过对沉管隧道沉降现象及规律进行归纳分析后,提出改进Richards法以考虑管顶回淤条件下沉管的沉降,并进行清淤条件下沉降预测的尝试。研究结果表明:改进Richards法稳定可靠,可以较好地预测回淤及清淤条件下沉管的沉降,为今后沉管隧道工程设计施工提供借鉴。Settlement prediction has always been a hot issue in geotechnical engineering research. Due to its special engineering characteristics, there is not any clear prediction model for immersed tunnels. Based on the measured data of post-construction settlement of the immersed tunnel for Hongkong-Zhuhai-Macao Bridge, this paper analyzes the applicability of seven common prediction models. It was found during the study that the Hushino method and the Richards method performed better for immersed tunnel segments with a small amount of back-silting at the top of the immersed tunnel;However, for immersed tunnel segments with a large amount of back-silting at the top of the immersed tunnel, the first six models could not consider the influence of back siltation and there was a large deviation in the predicted values. The results of prediction were still not ideal though back siltation variables were taken into the GA+BP neural network. Based on the above scenarios, after summarizing and analyzing the phenomena and law of settlement of an immersed tunnel, an improved Richards method was proposed to consider the settlement of an immersed tunnel under the condition of back silting and an attempt was made to predict the settlement of the tunnel under the condition of back siltation at the top of the immersed tunnel. The results show that the improved Richards method is stable and reliable, and can better predict the settlement of an immersed tube under the conditions of back siltation and dredging, which provides a reference for the design and construction of immersed tunnels in the future.

关 键 词：沉管隧道 沉降预测 回淤 改进Richards法 

分 类 号：U455.46[建筑科学—桥梁与隧道工程] TU43[交通运输工程—道路与铁道工程]