【摘要】：泄流坡位于甘肅南部舟曲縣境內,分布在坪定—化馬斷裂帶上,屬于典型的斷裂帶滑坡,斷層不僅控制著滑坡邊界,也影響著滑坡土體變形。通過現(xiàn)場調查取樣并開展室內實驗,獲取滑坡土體物理力學參數(shù)。綜合運用有限單元法基本原理,采用時間硬化Drucker-Prager土體流變本構方程,分析在構造應力場和重力場作用下,滑坡土體受力與變形,并與現(xiàn)場監(jiān)測數(shù)據比較,研究泄流坡滑坡的變形特征。指出斷層上、下斷盤控制著滑坡體邊界和走向,也影響邊界接觸區(qū)域土體變形。泄流坡滑坡土體流變變形在坡體中部最大,并在滑坡體上交替形成堆積區(qū)與拉裂區(qū)。計算結果表明泄流坡滑坡坡體最大流變變形滑移量目前穩(wěn)定在0.3m·a~(-1),仍處于穩(wěn)定蠕滑狀態(tài),流變變形占全年滑動變形的8.36%。指出泄流坡坡腳堆載反壓對于泄流坡坡體整體變形影響較小,但可以顯著緩解S313公路路基變形。
[Abstract]:The leachate slope is located in Zhouqu county in southern Gansu province and is distributed in the Pingding-Huama fault zone, which is a typical landslide. The fault not only controls the landslide boundary, but also affects the deformation of the landslide soil mass. The physical and mechanical parameters of landslide soil were obtained by field investigation and laboratory experiments. Based on the basic principle of finite element method and the rheological constitutive equation of time-hardened Drucker-Prager soil, the stress and deformation of landslide soil under the action of tectonic stress field and gravity field are analyzed and compared with the field monitoring data. The deformation characteristics of leachate slope landslide are studied. It is pointed out that the lower fault plate controls the boundary and strike of the landslide body and also affects the deformation of soil in the boundary contact area. The rheological deformation of the leachate landslide is the largest in the middle of the slope, and the accumulation area and the tensile crack zone are formed alternately on the landslide body. The results show that the maximum rheological deformation slip of leachate landslide is stable at 0.3m a-1 and is still in a steady creep state, and the rheological deformation accounts for 8.36% of the whole year's sliding deformation. It is pointed out that the backpressure at the bottom of the leachate slope has little effect on the overall deformation of the leachate slope body, but it can significantly alleviate the roadbed deformation of the S313 highway.
【作者單位】： 安徽工業(yè)大學建筑工程學院;中國地質科學院地質力學研究所;
【基金】：國家科技支撐項目(2011BAK12B09) 地質調查項目(1212011120072) 安徽省教育廳重點項目(KJ2014A030)資助
【分類號】：P642.22

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