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Application of physics-data-driven method to identify the weak interlayers in underground geotechnical engineering
Tunnelling and Underground Space Technology ( IF 6.7 ) Pub Date : 2025-01-24 , DOI: 10.1016/j.tust.2025.106416
Zitao Chen, Quansheng Liu, Penghai Deng, Yin Bo, Demei Liu, Yucong Pan, Honggan Yu

The accurate description of the internal structure of weak interlayers is a prerequisite for the safe construction of deep geotechnical engineering with complicated geological conditions. Geophysical tomography techniques are usually used to detect the mechanical properties and spatial distribution and of deep weak interlayers. However, the mechanical properties of weak interlayers cannot be measured directly and the spatial distribution is conventionally difficult to explain by geophysical tomography techniques with ambiguous and inaccurate. In this work, a novel Physics-Data-Driven Method (PDDM) is proposed to identify the internal structure of weak interlayers based on inverse analysis. The constrained covariance matrix is constructed based on the results of geophysical tomography, and a structure similar to “fault core-damage zone-host rock” is achieved, which accurately describes the spatial distribution of weak interlayers. The field application results of Xiluodu underground chamber show: 1) Compared with conventional inverse analysis, PDDM enhances the convergence of simulation results to the field observations, with the relative error basically within 20%, meeting the engineering precision requirements; 2) PDDM can continuously optimize the spatial distribution of the weak interlayer based on the results of geophysical tomography, and finely identify the internal structure and distribution range. The results of PDDM have positive significance for engineering disaster prevention near weak interlayers.

中文翻译:


应用物理数据驱动方法识别地下岩土工程中的弱夹层



准确描述弱层内部结构是地质条件复杂深部岩土工程安全施工的前提。地球物理层析成像技术通常用于检测深部弱夹层的力学性能和空间分布。然而,弱夹层的力学性能无法直接测量,空间分布通常难以用地球物理层析成像技术解释,且模棱两可且不准确。在这项工作中,提出了一种新的物理数据驱动方法 (PDDM) 来基于逆分析来识别弱层的内部结构。基于地球物理层析成像结果构建约束协方差矩阵,实现了类似于“断芯-损伤带-主岩”的结构,准确描述了弱夹层的空间分布。溪洛渡地下室的现场应用结果表明:1)与传统逆分析相比,PDDM增强了模拟结果与现场观测的收敛性,相对误差基本在20%以内,满足工程精度要求;2)PDDM可以根据地球物理层析成像的结果持续优化弱夹层的空间分布,精细识别内部结构和分布范围。PDDM 结果对弱夹层附近工程防灾具有积极意义。
更新日期:2025-01-24
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