人民长江 ›› 2022, Vol. 53 ›› Issue (4): 118-124.doi: 10.16232/j.cnki.1001-4179.2022.04.019

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典型震裂山体发育特征及形成机制分析——以四川省茂县叠溪镇松坪沟为例

王永学;朱凌;裴向军;尹强;郑益伟;阿帕尔   

  • 发布日期:2022-05-24

Development characteristics and formation mechanism of typical earthquake-induced cracked slope in Songpinggou, Maoxian County, Sichuan Province

WANG Yongxue1, ZHU Ling2, PEI Xiangjun2, YIN Qiang3, ZHENG Yiwei3, A Paer3   

  • Published:2022-05-24

摘要: 为了揭示强震作用下斜坡的震裂损伤特征及其演化规律,对四川省茂县叠溪镇松坪沟流域的3个典型震裂山体开展了地质条件及震裂纹调查。结果表明:(1)震裂斜坡震裂纹的扩展主要与结构面特征有关,震裂纹往往沿着节理触发和扩展。(2)震裂纹的组合特征控制了震裂山体的失稳模式。(3)强震过程中,在冲压-拉张荷载下主要形成拉张裂纹、冲压裂纹及压致拉裂;在振动剪切荷载下主要形成张性雁列和压扭性雁列2种裂纹类型。(4)地震造成的震裂纹加速了斜坡的失稳破坏,强震山区地震荷载造成的震裂纹是斜坡失稳的关键因素。

关键词: 震裂损伤特征;震裂山体;震裂纹;强震作用;四川省;

Abstract: In order to reveal the seismic damage characteristic and evolution mechanism of slopes under strong earthquakes, the geological conditions and seismic cracks of three typical seismic cracked mountains in Songpinggou valley, Diexi Town, Maoxian County, Sichuan Province were investigated. The main findings were as follows: ① the propagation of seismic cracks on the slope was mainly related to the characteristics of structural planes, and the seismic cracks were often triggered and propagated along joints. ② The combination characteristics of seismic cracks controlled the instability mode of the cracked slope. ③ In the process of strong earthquake, compression crack, tension crack, and tension crack were mainly triggered by compression-tension loadings. Under the dynamic shear loading, tension echelon and compression torsion echelon cracks were induced. ④ The seismic cracks induced by the earthquakes accelerated the failure of the slopes. The seismic cracks caused by seismic loading in strong earthquake mountainous area are the key factor of slope instability.

Key words: seismic damage characteristic; seismic cracked mountain; seismic crack; strong earthquake action; Sichuan Province