回填荷载下卸荷式船闸受力与变形监测分析
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摘要
带卸荷板的整体式闸室结构具有降低闸室内力和位移、增加抗浮能力的作用,作为一种新型水工结构,首次应用于浍河南坪船闸工程。为进一步揭示该闸室结构在回填荷载作用下的受力与变形特性,通过现场监测和数值模拟,分析了回填荷载下闸墙所承受的土压力、孔隙水压力以及闸墙变形量随时间的变化规律:相较于传统的坞式闸室结构,带卸荷板的整体式闸室结构所受到的土压力和有效应力显著降低,卸荷效应明显,闸室结构变形得到有效控制,新结构提高了船闸的安全性与稳定性。
The integral lock chamber with unloading plate can reduce the inner force and displacement of the lock chamber and increase the anti-floating capacity. As a new type of hydraulic structure, it is firstly applied to Nanping Navigation Lock Project in Huihe River. In order to further reveal the mechanical and deformation characteristics of integral gate chamber structure with unloading plate under backfilling load, the variation law of earth pressure, pore water pressure and deformation of sluice wall with time during backfilling construction was analyzed by field monitoring and numerical simulation. Compared with the traditional dock type lock chamber structure, the earth pressure and effective force of the integral lock chamber structure with unloading plate are reduced significantly, the unloading effect is obvious, the deformation of the lock chamber structure is effectively controlled and the new structure has improved the safety and stability of the ship lock.
The integral lock chamber with unloading plate can reduce the inner force and displacement of the lock chamber and increase the anti-floating capacity. As a new type of hydraulic structure, it is firstly applied to Nanping Navigation Lock Project in Huihe River. In order to further reveal the mechanical and deformation characteristics of integral gate chamber structure with unloading plate under backfilling load, the variation law of earth pressure, pore water pressure and deformation of sluice wall with time during backfilling construction was analyzed by field monitoring and numerical simulation. Compared with the traditional dock type lock chamber structure, the earth pressure and effective force of the integral lock chamber structure with unloading plate are reduced significantly, the unloading effect is obvious, the deformation of the lock chamber structure is effectively controlled and the new structure has improved the safety and stability of the ship lock.
引文
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[2] 姜满山,李夫仲.南坪船闸工程重要性及创新设计[J].工程与建设,2016,30(1):49-52.
[3] BENMEBAREK S,KHELIFA T ,BENMEBAREK N ,et al.Numerical Evaluation of 3D Passive Earth Pressure Coefficients for Retaining Wall Subjected to Translation[J].Computers and Geotechnics,2008,35(1):47-60.
[4] 付长静,李国英,米占宽,等.卸荷式板桩高桩梁板码头结构土压力简化计算[J].岩土力学,2015,36(8):2426-2432.
[5] 王琰,谭慧明,焦志斌.分离卸荷式板桩码头中桩基-卸荷承台结构的卸荷机理研究[J].水道港口,2017,38(1):72-79.
[6] 龚丽飞.分离卸荷式地下连续墙板桩码头结构与土相互作用研究[D].南京:南京水利科学研究院,2007:34-66.
[7] 李武,陈甦,程泽坤,等.水平荷载作用下桶式基础结构稳定性研究[J].中国港湾建设,2012(5):14-18.
[8] 席荣,关云飞,李夫仲.带卸荷板的整体式闸室结构受力与变形有限元分析[J].水运工程,2018(5):116-121.
[9] 郭鸿仪,吕宝柱.卸荷板卸荷效应的模型验证[J].岩土工程学报,1993,15(1):81-85.