南水北调与水利科技
南水北調與水利科技
남수북조여수리과기
South-to-North Water Transfers and Water Science & Technology
2015年
5期
946-952
,共7页
裂缝%优先流%降雨%边坡稳定性%黄土滑坡
裂縫%優先流%降雨%邊坡穩定性%黃土滑坡
렬봉%우선류%강우%변파은정성%황토활파
fracture%preferential flow%rarinfall,slope stability%loess landslide
针对黄陵印台山老滑坡不稳定现状，通过野外调查采样及一系列室内试验方式获取土样基本物理性质及抗剪强度指标，在分析非饱和土渗流过程及作用机理基础上，探讨了印台山裂缝对黄土边坡稳定性影响，同时借助 geo-studio2007软件模拟了上述过程。研究结果表明：降雨强度及降雨持时与边坡稳定性存在明显相关性，降雨强度越大，边坡稳定性越低；降雨持时越长，边坡稳定性也越低。印台山边坡裂缝的存在是影响边坡稳定的积极因素，裂缝产生的优先流一方面通过对土体内部孔隙水压力的改变来影响边坡应力平衡，另一方面通过与岩土层分界面的相互作用，促成岩土层分界面发展为优势滑动面，进而影响边坡整体稳定性。在滑坡防治方面，建议在坡体前缘段设置抗滑桩，以增大坡体抗滑阻力，并对边坡裂缝进行有机物填充处理，避免优先流的产生。
針對黃陵印檯山老滑坡不穩定現狀，通過野外調查採樣及一繫列室內試驗方式穫取土樣基本物理性質及抗剪彊度指標，在分析非飽和土滲流過程及作用機理基礎上，探討瞭印檯山裂縫對黃土邊坡穩定性影響，同時藉助 geo-studio2007軟件模擬瞭上述過程。研究結果錶明：降雨彊度及降雨持時與邊坡穩定性存在明顯相關性，降雨彊度越大，邊坡穩定性越低；降雨持時越長，邊坡穩定性也越低。印檯山邊坡裂縫的存在是影響邊坡穩定的積極因素，裂縫產生的優先流一方麵通過對土體內部孔隙水壓力的改變來影響邊坡應力平衡，另一方麵通過與巖土層分界麵的相互作用，促成巖土層分界麵髮展為優勢滑動麵，進而影響邊坡整體穩定性。在滑坡防治方麵，建議在坡體前緣段設置抗滑樁，以增大坡體抗滑阻力，併對邊坡裂縫進行有機物填充處理，避免優先流的產生。
침대황릉인태산로활파불은정현상，통과야외조사채양급일계렬실내시험방식획취토양기본물이성질급항전강도지표，재분석비포화토삼류과정급작용궤리기출상，탐토료인태산렬봉대황토변파은정성영향，동시차조 geo-studio2007연건모의료상술과정。연구결과표명：강우강도급강우지시여변파은정성존재명현상관성，강우강도월대，변파은정성월저；강우지시월장，변파은정성야월저。인태산변파렬봉적존재시영향변파은정적적겁인소，렬봉산생적우선류일방면통과대토체내부공극수압력적개변래영향변파응력평형，령일방면통과여암토층분계면적상호작용，촉성암토층분계면발전위우세활동면，진이영향변파정체은정성。재활파방치방면，건의재파체전연단설치항활장，이증대파체항활조력，병대변파렬봉진행유궤물전충처리，피면우선류적산생。
According to the unstable status of old landslide in Yintaishan of Huangling County,the physical properties and shear-ing strength of soil samples collected in the field were determined through laboratory tests.Based on the analysis of seepage process and action mechanism of unsaturated soil,the impacts of ground fracture on the stability of Yintaishan slope were dis-cussed,and the process was simulated using the geo-studio2007 software.The results showed that there is an obvious correla-tion between precipitation intensity and duration and slope stability,and slope stability decreases with the increasing of precipi-tation intensity and duration.The existence of ground fracture can affect slope stability.On one hand,the preferential flow gen-erated by ground fracture can affect the stress equilibrium of soil slope through the variation of pore water pressure;on the oth-er hand,the interaction between the preferential flow and interface of soil layer can change the interface of soil layer into the pri-ority slip surface and then affect slope stability.Finally,based on its adverse impact of fracture,some suggestions of prevention and treatment were put forward,such that the anti-slide pile should be considered at the beginning of slope to increase the anti-skid resistance and the fracture is filled with the organic matter to avoid the preferential flow.
