改性分散性土边坡稳定性离心模型试验  

Centrifuge model for stability of dispersive soil modification slope

作　　者：周嘉伟 于沭[2] 苏安双 梁建辉[2] 李兆宇 李炎隆[1] ZHOU Jiawei;YU Shu;SU Anshuang;LIANG Jianhui;LI Zhaoyu;LI Yanlong(State Key Laboratory Base of Eco-hydraulic Engineering in Arid Area, Institute of Water Resources and Hydro-Electric Engineering,Xi’an University of Technology,Xi’an,Shaanxi 710048,China;China Institute of Water Resources and Hydropower Research,Beijing 100048,China;Heilongjiang Province Hydraulic Research Institute,Harbin,Heilongjiang 150080,China)

机构地区：[1]西安理工大学水利水电学院,西北旱区生态水利国家重点实验室,陕西西安710048 [2]中国水利水电科学研究院,北京100048 [3]黑龙江省水利科学研究院,黑龙江哈尔滨150080

出　　处：《西北农林科技大学学报（自然科学版）》2020年第7期148-154,共7页Journal of Northwest A&F University(Natural Science Edition)

基　　金：国家重点研发计划项目(2018YFC0407103);国家自然科学基金重点项目(41731289);国家自然科学基金面上项目(51879285);中国科学院学部咨询评议项目(2018-Z02-A-008)。

摘　　要：【目的】模拟并研究改性分散土边坡的稳定性,为分散性土质边坡的工程安全提供技术支持。【方法】对黑龙江省胖头泡蓄滞洪区堤防工程筑堤土料的分散性进行鉴定,通过针孔、碎块等室内试验提出堤防表层土改性方案,并对表层改性的分散性土边坡进行离心模型试验,将模拟30 m高堤防边坡模型的离心加速度从0逐渐加到50 g,稳定运行20 min后,分析离心加速阶段和匀速运行阶段边坡的变形规律,研究胖头泡蓄滞洪区堤防工程改性分散土与分散性土结合的稳定性。【结果】边坡模型离心加速阶段结束时最大沉降量为1.3 mm,沉降率为0.22%;离心匀速运行阶段结束时,整体最大沉降量为1.74 mm,沉降率为0.29%;整个边坡模型在表层土改性后沉降量较小,改性分散土层和分散性土层未发生大的错动、滑移以及脱空变形等现象。【结论】胖头泡蓄滞洪区堤防工程改性后的分散性土能够与分散性土层良好结合,可有效改良堤防工程土质。【Objective】Stability of the modified dispersive soil slope was simulated and studied to provide technical support for the engineering safety of dispersive soil slope.【Method】The dispersibility of soil from the embankment in Heilongjiang Pangtoupao flood detention basin was identified.The scheme of dispersive soil modification on slope surface was carried out to enhance water erosion resistance of the embankment.Centrifuge model test for the stability of modified slope was conducted and it was accelerated from 0 to 50 g by centrifuge before operating for 20 minutes to study the settlement deformation.【Result】The maximum sedimentation of the slope was 1.3 mm and sedimentation rate was 0.22%during the centrifugal acceleration period.The maximum sedimentation of the slope was 1.74 mm and sedimentation rate was 0.29%when the centrifugal stable operation period was over.The sedimentation of the slope model was small,and there was no sliding deformation between modified soil layer and dispersive soil layer.【Conclusion】The modified dispersive soil in the embankment of Pangtoupao flood detention basin can combine with the original soil firmly and improve water erosion resistance.

关 键 词：分散性土 改性分散土 边坡稳定性 离心模型试验 

分 类 号：TV871.1[水利工程—水利水电工程]