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[1]YUE Chong,ZHAO Jing,NIU Anfu,et al.Mechanism of Large-scale Deformation in Mianning Cross-fault Short-level Based on Finite Element Method[J].Journal of Seismological Research,2020,43(04):666-673.

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Mechanism of Large-scale Deformation in Mianning Cross-fault Short-level Based on Finite Element Method

Journal of Seismological Research[ISSN 1000-0666/CN 53-1062/P] Volume: 43 Number of periods: 2020 04 Page number: 666-673 Column: Public date: 2020-09-17

Title:: Mechanism of Large-scale Deformation in Mianning Cross-fault Short-level Based on Finite Element Method

Author(s):: YUE Chong¹; 2; ZHAO Jing¹; NIU Anfu¹; JI Ping¹; LI Xiaofan¹; SU Qin³; YANG Fan⁴; (1.China Earthquake Networks Center,Beijing 100045,China)(2.Key Laboratory of Earthquake Dynamics,Institute of Geology,China Earthquake Administration,Beijing 100029,China)(3.Survey Engineering Institute,Sichuan Earthquake Agency,Ya'an 625000,Sichuan,China)(4.Hebei Earthquake Agency,Shijiazhuang 050021,Hebei,China)

Keywords:: Mianning cross-fault short-level; finite element method; Mohr-Coulomb; fluid-solid coupling model

CLC:: P315.725

DOI:: -

Abstract:: Firstly,we analyzed original observation data and calculated the average annual rate of the Mianning fault-crossing short-level site on the Anninghe fault zone.Then combined different characteristics of encrypted observation data in the 1-1C segment,we mainly focused on the two main influencing factors of landslide and pumping.Finally we constructed the three-dimensional Mohr-Coulomb elastoplastic landslide models and the two-dimensional fluid-solid coupling model of the pumping by the finite element method,and obtained the influence modes of two main factors by simulation.The result showed that:The range of about 300 m from the 1C point in the Mianning 1-1C segment is the slope toe area where an ancient landslide body is located.The long-term cumulative effect of the ancient landslide body on the slope toe area makes this place uplift,which caused the 1-1C segment to gradually decrease and then increase again during the large settlement induced by pumping.The groundwater pumping caused obvious deformation characteristics of the pumping funnel along the well.However,due to the influence of the free drainage surface and loose sediment layer,the point 1 on the slope is more susceptible to the settlement deformation caused by pumping after the balance of the water-bearing system was broken,which made the settlement deformation in this area comparable to or even greater than that near the well.

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Last Update: 2020-09-17