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沈超, 薄景山, 张雪东, 孙强强, 王磊. 逆断层地表变形及避让距离的离心模型试验研究[J]. 岩土工程学报, 2022, 44(3): 420-427. DOI: 10.11779/CJGE202203003
引用本文: 沈超, 薄景山, 张雪东, 孙强强, 王磊. 逆断层地表变形及避让距离的离心模型试验研究[J]. 岩土工程学报, 2022, 44(3): 420-427. DOI: 10.11779/CJGE202203003
SHEN Chao, BO Jing-shan, ZHANG Xue-dong, SUN Qiang-qiang, WANG Lei. Centrifugal model tests on surface deformation and setback distance of reverse faults[J]. Chinese Journal of Geotechnical Engineering, 2022, 44(3): 420-427. DOI: 10.11779/CJGE202203003
Citation: SHEN Chao, BO Jing-shan, ZHANG Xue-dong, SUN Qiang-qiang, WANG Lei. Centrifugal model tests on surface deformation and setback distance of reverse faults[J]. Chinese Journal of Geotechnical Engineering, 2022, 44(3): 420-427. DOI: 10.11779/CJGE202203003

逆断层地表变形及避让距离的离心模型试验研究

Centrifugal model tests on surface deformation and setback distance of reverse faults

  • 摘要: 断层同震错动引起的地表变形破坏是工程场地评价中的难点之一,如何合理避开同震地表破裂带是工程选址必须解决的问题,关键在于能否准确预测发震断层错动过程中的地表变形演化特征。基于土工离心模型试验过程中获取的高精度地表监测数据,定量分析给出了断层面倾角为60°且厚度约为40 m的上覆砂土在不同基岩位错下的地表变形和坡度变化规律,并将地表变形划分为稳定区、倾斜变形区和严重变形区。最后,结合中国的危房鉴定标准,进一步分析给出了逆断层在位错量、震级和土层厚度影响下的地表避让距离关系式,进而建立了实用的逆断层地表避让预测方法。有关成果使得解决强震地表变形这一复杂问题成为可能,对进一步认识和研究逆断层错动引起的地表变形及相关规范的修订具有一定的理论和实际意义。

     

    Abstract: The surface deformation and failure caused by movement of seismic faults is one of the difficulties in engineering field evaluation. How to reasonably avoid the co-seismic surface rupture zone is a problem that must be solved in engineering site selection. The key is whether the surface deformation evolution characteristics in the process of fault dislocation can be accurately predicted. Here, based on the high-precision monitoring data obtained in the geotechnical centrifugal model tests, the surface deformation and slope variation of the overlying soil with the thickness of 40 m and dip angle of 60° under different bedrock dislocations are quantitatively analyzed, and the surface deformation is divided into stable zone, inclined deformation zone and severe deformation zone. Finally, based on the standard of dangerous buildings appraisal in China, the surface setback distance formula for reverse faults under the influences of dislocation quantity, earthquake magnitude and soil thickness is given, and then a practical surface setback prediction method for reverse faults is established. The relevant results make it possible to solve the complex problem of surface deformation caused by strong earthquakes, which has certain theoretical and practical significance for further understanding and studying the surface deformation caused by movement of reverse faults and the revision of the relevant codes.

     

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