【摘要】：我國西南地區(qū)降雨量大,持時久,該地區(qū)的自然邊坡和人工邊坡在雨季經(jīng)常發(fā)生滑坡,對人類生命、財產(chǎn)安全造成了巨大威脅。因此,降雨入滲條件下邊坡的穩(wěn)定性研究,具有一定的理論和實踐意義。 以云南省某一公路邊坡為研究對象,根據(jù)研究區(qū)域的工程地質(zhì)概況結(jié)合現(xiàn)場調(diào)研和室內(nèi)試驗,采用有限差分軟件FLAC2D建立了邊坡的數(shù)值模型,分析了不同的降雨強度、持時以及雨型對邊坡穩(wěn)定性的影響,并研究了錨桿支護(hù)對不同降雨雨型條件下邊坡的加固作用。研究結(jié)果表明： 降雨強度較大時,雨水入滲主要引起邊坡表層的飽和度增加；而降雨強度較小時,雨水更容易入滲到邊坡的內(nèi)部。降雨持時相同時,邊坡的剪應(yīng)變增量和塑性區(qū)隨著降雨強度的增大而增大；降雨條件下,邊坡的破壞以剪破壞為主,同時在坡頂部位存在著一定范圍的拉破壞區(qū)；降雨過程中,邊坡的潛在滑移面由巖土層接觸面處逐漸向坡頂部位延伸。強降雨條件下,邊坡的位移較大,其中邊坡水平向位移隨著高程的減小而增大,而豎直向位移隨著高程的減小而減小。隨著降雨持時的增加,邊坡的位移不斷增大,而安全系數(shù)不斷減小。 不同降雨雨型下,雨強增加的情況下第一級邊坡的飽和區(qū)最大,其次為雨強不變以及雨強減小的情況。錨固前相同高程處,雨強減小的情況下,坡面監(jiān)測點的位移最大,雨強不變及雨強增加情況下位移依次減小。錨固后邊坡的安全系數(shù)增大,坡面監(jiān)測點的位移明顯減��；不同降雨條件下錨固后邊坡監(jiān)測點位移關(guān)系與錨固前恰好相反。 降雨作用后錨桿的軸力和剪力均增大,不同降雨條件下,錨桿相同部位的軸力和剪力均相近。
[Abstract]:The rainfall in southwest China is large and lasting for a long time. The natural and artificial slopes in this area often slide in the rainy season, which poses a great threat to human life and property safety. Therefore, the study of slope stability under rainfall infiltration is of theoretical and practical significance. Taking a highway slope in Yunnan Province as the research object, the numerical model of the slope is established by using the finite difference software FLAC2D, and the different rainfall intensity is analyzed according to the engineering geological situation of the studied area combined with the field investigation and indoor test. The influence of duration and rain type on slope stability is studied. The reinforcement effect of bolt support on slope under different rainfall rain patterns is studied. The results show that Rain Water infiltration mainly results in the increase of surface saturation of slope when rainfall intensity is high, while when rainfall intensity is small, Rain Water infiltration is more easily to the slope interior. When the rainfall duration is the same, the increment of shear strain and plastic zone of slope increase with the increase of rainfall intensity. Under rainfall condition, the failure of slope is dominated by shear failure, and at the same time there is a certain range of tensile failure zone at the top of the slope. The potential slip surface of the slope extends gradually from the contact surface of the rock and soil layer to the top of the slope. Under the condition of heavy rainfall, the displacement of the slope is larger, in which the horizontal displacement of the slope increases with the decrease of the elevation, while the vertical displacement decreases with the decrease of the elevation. With the increase of rainfall duration, the slope displacement increases and the safety factor decreases. Under different rainfall patterns, the saturation zone of the first grade slope is the largest when the rainfall intensity is increasing, and the rain intensity is invariant and the rain intensity decreases. At the same height before anchoring, the displacement of the monitoring point on the slope is the largest when the rain intensity decreases, and the displacement decreases in turn when the rain intensity is constant and the rain intensity is increasing. After anchoring, the safety factor of the slope increases and the displacement of the slope surface monitoring point decreases obviously, and the displacement relationship of the slope monitoring point after anchoring under different rainfall conditions is opposite to that before anchoring. The axial force and shear force of anchor rod increase after rainfall, and the axial force and shear force of the same part of anchor rod are similar under different rainfall conditions.
【學(xué)位授予單位】：蘭州大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2013
【分類號】：TU43

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