摘要
针对航道边坡土体为膨胀土时极易产生季节性、浅层性滑动,影响航运能力及工程安全的问题,依托芜申航道南京段失稳边坡处治工程,对膨胀土进行往复干湿循环后的直剪试验和考虑干湿循环效应的稳定性分析。结果表明:随干湿循环次数的增加,膨胀土的黏聚力、内摩擦角逐渐衰减,其衰减主要发生在前3次干湿循环过程中,之后趋于稳定;黏聚力的衰减程度远大于内摩擦角;考虑干湿循环效应引起的土体强度衰减,是获得膨胀土边坡真实稳定系数的正确计算方法。针对失稳边坡提出采用门字形抗滑桩的处治措施,应用效果良好,具有较好的工程借鉴意义。
Regarding the problem of seasonal and shallow sliding when the slope of the navigation channel is swelling soil,which affects the shipping capacity and engineering safety,we carry out the straight shear test of swelling soil after reciprocal wet and dry cycles and the stability analysis considering the effect of wet and dry cycles based on the treatment project for the destabilized slope of Nanjing section of the Wu-Shen Navigation Channel.The results show that the cohesion and internal friction angle of swelling soil decay gradually with the increase of the number of wet and dry cycles,and the decay mainly occurs in the first three dry and wet cycles,and then gradually stabilizes.The decay degree of cohesion is much larger than that of internal friction angle.Considering the soil strength decay caused by the wet and dry cycle effect is the correct calculation method to obtain the true stability coefficient of swelling soil slopes.The treatment measure of using gate-shaped anti-slip piles is proposed for the unstable slope,and has good application effect and engineering reference significance.
作者
王艳芳
江涛
印昊
夏炎
张磊
WANG Yan-fang;JIANG Tao;YIN Hao;XIA Yan;ZHANG Lei(Jinling Institute of Technology,Nanjing 211169,China;JSTI Group,Nanjing 210017,China;CCCC Water Transportation Consultants Co.,Ltd.,Beijing 100007,China)
出处
《水运工程》
北大核心
2022年第9期179-185,共7页
Port & Waterway Engineering
基金
国家重点研发计划重点专项(2019YFC15098000)
国家自然科学基金青年科学基金项目(51908278)
江苏省高校自然科学基金面上项目(19KJD410002)
金陵科技学院高层次人才科研启动项目(jit-b-202017)。
关键词
膨胀土
干湿循环
强度衰减
门字形抗滑桩
稳定分析
swelling soil
wet and dry cycles
strength decay
gate-shaped anti-slip pile
stabilization analysis