基于离心试验的引调水工程含深层原生裂隙膨胀土层渠坡稳定性分析  

Slope Stability Analysis of Expansive Soil with Diversion Project Based on Centrifugal Test

作　　者：韦松涛 龚壁卫[2] 李波[2] 胡波[2] 程展林[2] WEI Song-tao;GONG Bi-wei;LI Bo;HU Bo;CHENG Zhan-lin(School of Civil Enigineering and Architecture,Anhui University of Science and Technology,Huainan 232001,China;Key Laboratory of Geotechnical Mechanics and Engineering of the Ministry of Water Resources,Changjiang River Scientific Research Institute,Wuhan 430010,China)

机构地区：[1]安徽理工大学土木建筑学院,安徽淮南232001 [2]长江科学院水利部岩土力学与工程重点实验室,湖北武汉430010

出　　处：《水电能源科学》2025年第2期98-103,共6页Water Resources and Power

基　　金：国家自然科学基金项目(52208329);中央级公益性科研院所基本科研业务费(CKSF2023327/YT);安徽省引江济淮集团有限公司科技项目(YJJH-ZT-ZX-20230118528,YJJH-ZT-ZX-20191031216)。

摘　　要：引调水工程因跨度范围大,渠道经常穿过含深层原生裂隙区域,现场滑坡膨胀土层中实际存在的深层原生裂隙顺坡向呈8°~12°,倾向河渠。为掌握深层原生裂隙对边坡稳定性的影响,通过预设双层土工膜的方式模拟倾角为12°、48°的典型组合裂隙,开展了含深层原生裂隙边坡的离心模型试验,进一步推导了计算离心模型在离心机加速度场中边坡安全系数的简化理论。结果表明,离心加速度逐级增大过程中,边坡顶部沉降和坡面水平位移逐渐增大,同时在坡肩和坡面依次出现裂隙且随之扩展,边坡失稳并沿12°裂隙面滑动;计算得到离心模型边坡安全系数随加速度增大而逐渐降低但降低速率逐渐减小,产生破坏时的安全系数已小于1.0;进一步分析表明,土工膜裂隙面贯通率越高,边坡安全系数越低,同时裂隙面分布位置也对边坡稳定性有影响。研究结果为含深层原生裂隙边坡的分析提供了依据。Due to the large span of the water diversion project,the channel often passes through the area containing deep primary fissures,and the actual deep primary fissures in the expansive soil stratum of the on-site landslide are 8°~12°along the slope,which tends to the river channel.In order to understand the influence of deep primary crack on the stability of slope,a typical combined crack with dip angle of 12°and 48°was simulated by preset double layer geomembrane.A geotechnical centrifugal model test was carried out,and a simplified theory for calculating the safety factor of the centrifugal model slope in the centrifuge acceleration field was further derived.The results show that with the progressive increase of centrifugal acceleration,the slope top settlement and horizontal displacement gradually increase.At the same time,cracks appear and expand in the slope shoulder and slope,and the slope gradually becomes unstable and slides along the 12°fracture plane.The calculated centrifugal slope safety factor decreases gradually with the acceleration increasing,but the reduction rate decreases gradually,and the safety factor is less than 1.0 when the failure occurs.Further analysis shows that the higher the fracture penetration rate,the lower the safety factor of slope,and the distribution location of fracture surface also affects the stability of slope.The research results provide a basis for the analysis of the slope with deep primary fracture.

关 键 词：边坡 裂隙 离心模型试验 安全系数 裂隙扩展 

分 类 号：TV223.1[水利工程—水工结构工程] TU443[建筑科学—岩土工程]