降雨条件下球状风化花岗岩类土质边坡渗流特性与稳定性分析  

NUMERICAL ANALYSIS OF SEEPAGE CHARACTERISTICS AND STABILITY FOR SPHEROIDAL WEATHERED GRANITE-LIKE SOIL SLOPES UNDER RAINFALL CONDITIONS

作　　者：豆红强[1,2,3] 谢森华 王浩 简文彬[1,2,3] DOU Hongqiang;XIE Senhua;WANG Hao;JIAN Wenbin(School of Zijin Geology and Mining,Fuzhou University,Fuzhou 350116,China;Geological Engineering Research Center,Fujian Provincial University,Fuzhou 350116,China;Key Laboratory of Geological Hazards in Fujian Province,Fuzhou 350002,China)

机构地区：[1]福州大学,紫金地质与矿业学院,福州350116 [2]地质工程福建省高校工程研究中心,福州350116 [3]福建省地质灾害重点实验室,福州350002

出　　处：《工程地质学报》2023年第2期638-649,共12页Journal of Engineering Geology

基　　金：国家自然科学基金(资助号:42007235,U2005205,41972268);福州市科技创新平台项目(资助号:2021-P-032)。

摘　　要：降雨作为边坡失稳破坏的最常见诱因,在非均质性、非连续性特征显著的球状风化花岗岩类土质边坡中具有更为复杂的影响特征。依托ABAQUS及其二次开发,通过构建降雨条件下球状风化体类土质边坡渗流模型,综合考虑降雨参数的影响,开展了降雨条件下球状风化花岗岩类土质边坡渗流特性与其稳定性研究。研究结果表明:受球状风化体影响,边坡浅层土体更快达到饱和,并且其饱和速率亦受风化体的埋藏深度、“迎雨”面横截面积和含量控制;降雨条件下球状风化花岗岩类土质边坡潜在滑动面仍表现出显著的复杂多样性,存在与无雨状态相似的滑面,也可能拓展形成新的浅层滑面;边坡安全系数与降雨历时和降雨强度为负相关,随着降雨的持续有趋于平缓的趋势,但也能在球状风化体的影响下失去平缓趋势而持续降低;在所设雨型中,渐变递增型对边坡稳定性影响最大。研究成果可为降雨条件下球状风化花岗岩类土质边坡稳定性评价提供科学依据。As the most common cause of slope instability damage,rainfall has more complex influence characteristics in spheroidal weathered granite-type soil slopes with significant non-homogeneity and discontinuity characteristics.Based on ABAQUS and its secondary development,a study on the seepage characteristics and stability of spheroidal weathered granitic soil slopes under rainfall conditions was carried out by constructing a seepage model for spheroidal weathered granitic soil slopes and considering the influence of rainfall parameters.The results of the study show that the shallow soil of the slope is saturated more quickly under the influence of the spherical weathering body.The saturation rate is also controlled by the depth of burial of the weathering body,the cross-sectional area and content of the“rain-facing”surface.The potential sliding surfaces of the spherical weathering granite-like soil slope under rainfall conditions still show a significant complex diversity,and there are similar sliding surfaces to those in the rain-free state.The slope safety factor is negatively correlated with rainfall duration and intensity,and tends to level off as rainfall continues,but can also lose its leveling off trend and continue to decrease under the influence of spheroidal weathering bodies.Among the rainfall types,the gradual incremental type has the greatest influence on slope stability.

关 键 词：降雨入渗 降雨参数 球状风化体 数值模拟 边坡失稳 

分 类 号：TU18[建筑科学—建筑理论]