岩土力学
巖土力學
암토역학
ROCK AND SOIL MECHANICS
2013年
7期
2009-2016
,共8页
黄土滑坡%稳定性分析%三维极限平衡法%数值分析
黃土滑坡%穩定性分析%三維極限平衡法%數值分析
황토활파%은정성분석%삼유겁한평형법%수치분석
loess landslide%stability analysis%3D limit equilibrium method%numerical analysis
吕梁机场滑坡是机场建设前期发现的一处大型黄土滑坡，由于滑坡的东北侧为机场主跑道，因此，该滑坡对机场建设以及建成后的运营存在较大的影响。在详细的工程地质勘察和测试分析工作基础上，首先，分析了滑坡的特征和形成机制，进而评价了滑坡的稳定性；其次，通过勘察认为该滑坡为黄土层内发育的多层滑坡，在地貌上呈3级台阶，主滑坡滑动面位于离石黄土的古土壤层内；最后，利用GIS建立了滑坡的三维地质模型，并采用极限平衡法和强度折减法分析，分别评价了吕梁机场滑坡不同滑体的稳定性。三维极限平衡结果表明：该滑坡大多数分级、分块滑体在天然状态下处于稳定、基本稳定状态，强度折减分析得到的整个滑坡的安全系数为1.26，最危险区域出现在 II级滑坡后缘以及I-3滑坡，在上部加载或降雨情况下有可能再次发生滑动。总之，三维稳定性分析可以更真实地反映滑坡的真实状态，尤其是对于条件复杂的滑坡。
呂樑機場滑坡是機場建設前期髮現的一處大型黃土滑坡，由于滑坡的東北側為機場主跑道，因此，該滑坡對機場建設以及建成後的運營存在較大的影響。在詳細的工程地質勘察和測試分析工作基礎上，首先，分析瞭滑坡的特徵和形成機製，進而評價瞭滑坡的穩定性；其次，通過勘察認為該滑坡為黃土層內髮育的多層滑坡，在地貌上呈3級檯階，主滑坡滑動麵位于離石黃土的古土壤層內；最後，利用GIS建立瞭滑坡的三維地質模型，併採用極限平衡法和彊度摺減法分析，分彆評價瞭呂樑機場滑坡不同滑體的穩定性。三維極限平衡結果錶明：該滑坡大多數分級、分塊滑體在天然狀態下處于穩定、基本穩定狀態，彊度摺減分析得到的整箇滑坡的安全繫數為1.26，最危險區域齣現在 II級滑坡後緣以及I-3滑坡，在上部加載或降雨情況下有可能再次髮生滑動。總之，三維穩定性分析可以更真實地反映滑坡的真實狀態，尤其是對于條件複雜的滑坡。
려량궤장활파시궤장건설전기발현적일처대형황토활파，유우활파적동북측위궤장주포도，인차，해활파대궤장건설이급건성후적운영존재교대적영향。재상세적공정지질감찰화측시분석공작기출상，수선，분석료활파적특정화형성궤제，진이평개료활파적은정성；기차，통과감찰인위해활파위황토층내발육적다층활파，재지모상정3급태계，주활파활동면위우리석황토적고토양층내；최후，이용GIS건립료활파적삼유지질모형，병채용겁한평형법화강도절감법분석，분별평개료려량궤장활파불동활체적은정성。삼유겁한평형결과표명：해활파대다수분급、분괴활체재천연상태하처우은정、기본은정상태，강도절감분석득도적정개활파적안전계수위1.26，최위험구역출현재 II급활파후연이급I-3활파，재상부가재혹강우정황하유가능재차발생활동。총지，삼유은정성분석가이경진실지반영활파적진실상태，우기시대우조건복잡적활파。
The Lüliang airport landslide is a large loess landslide which was found in early construction of the airport. Due to airfield runway next to the northeastern of the landslide, the landslide makes a large influence on the engineering construction and safe operation. In order to assess landslide risk and prevent its damage, the geological features and formation mechanism of the landslide are analyzed based on the detailed engineering geological investigation and testing work. The landslide is considered as a multilayer landslide developed in loess layer. There are three steps on the landslide; and the main sliding surface locates in the paleosol layer of Lishi loess. Three-dimensional geological model is established using GIS; and the stability of the landslide is evaluated by limit equilibrium method and shear strength reduction method. Results from three-dimensional limit equilibrium analyses show that most parts of the landslide are stable or basic stable in natural state. From strength reduction analysis, the safety factor of the whole slope is 1.26. It is shown that the most dangerous areas appear in the posterior margin of landslide II and landslide I-3. In case of loading or rainfall condition, it is likely to slide again. In conclusion, three-dimensional stability analysis can more truly reflect the actual state of landslides, especially for complex landslide.
