地下连续墙受力变形光纤监测与数值模拟研究
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(1.南京大学 地球科学与工程学院,江苏 南京,210023;2. 华北科技学院(中国煤矿安全技术培训中心)计算机学院,北京,101601;3.香港理工大学土木及环境工程学系,香港;4.苏州南智传感科技有限公司,江苏 苏州 215123)

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Fiber Optic Monitoring and Numerical Simulation of Loading and Deformation Behavior of Diaphragm Wall
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(1. School of Earth Sciences and Engineering,Nanjing University,Nanjing 210023, China; 2. School of Computer Science, North China Institute of Science and Technology (National Safety Training Center of Coal Mines), Beijing 101601, China; 3. Department of Civil and Environmental Engineering, The Hong Kong Polytechnic University, Hong Kong, China; 4. Suzhou NanZee Sensing Co. Ltd, Suzhou 215123, China)

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    摘要:

    地下连续墙是一种常见的深基坑支护方式,具有刚度大、防渗性能好、适应范围广等优点,但其受力变形规律较为复杂。本文基于超弱光纤光栅感测技术,对某地铁车站基坑地下连续墙水平位移进行实时监测。将监测数据与数值模拟结果进行对比,验证了数值分析模型选取的合理性,并基于该数值分析模型研究了不同厚度软土层中,地下连续墙水平位移的变化规律,通过墙体位移梯度(Dw)和软土位移梯度(Dr)进行临界厚度比计算。研究结果显示:水平位移随软土厚度的变化呈“凸肚”状,沿深度方向划分为相对稳定区、线性增长区、最大变形区和线性下降区。利用Dw和Dr标定出临界厚度比为0.24;土压力变化在基坑前四步开挖过程中较为稳定,而在第五步开挖与施工后40天变化显著。上述研究结果为类似工程的设计、施工和监测方案的制定提供了重要参考。

    Abstract:

    As a common support method for deep excavation, diaphragm walls have complex loading and deformation regulation, which is a hot research topic in excavations. In this paper, based on the fiber Bragg grating sensing technology, the horizontal displacements of a diaphragm wall of a subway station was measured. The monitoring data was compared with the numerical simulation results, and the rationality of the numerical analysis model was verified. Based on the numerical analysis model, the variation law of the horizontal displacement of the underground diaphragm wall in the soft soil layer of different thickness was studied. The critical thickness ratio was calculated by the wall displacement gradient Dw and the soft soil displacement gradient Dr. The results show that the variation of horizontal displacement of diaphragm wall with the thickness of soft soil is generally "convex belly". The deformation of the diaphragm wall can be divided into relatively stable zone, linear growth zone, maximum deformation zone and linear decline zone along the depth direction. Using Dw and Dr to calibrate the critical thickness ratio as 0.24. The earth pressure changed steadily in the first four excavation processes but changed significantly in the fifth excavation process as well as 40 days after construction. The research results provide a valuable reference for the design, construction, and monitoring scheme of similar projects.

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刘天翔,朱鸿鹄,程刚,谭道远,魏广庆,施斌.地下连续墙受力变形光纤监测与数值模拟研究[J].防灾减灾工程学报,,():

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  • 在线发布日期:2023-12-14
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