本文選題：抗滑樁　切入點：土拱效應　出處：《西南交通大學》2017年碩士論文

【摘要】：四川滎經(jīng)縣楊底下滑坡原屬老滑坡,因2013年4.20蘆山地震居民集中安置,在老滑坡體前緣進行開挖,開挖前已完成了抗滑樁工程,但樁間未掛板,在2015年汛期首先樁間土體發(fā)生坍滑,嚴重時導致部分抗滑樁發(fā)生傾倒變形而失效(抗滑樁A6～A9以上土體垮塌至原放坡坡頂,A12～A24樁以上格構全部垮塌損毀,A19～A24樁發(fā)生傾斜)。顯然系統(tǒng)研究針對復雜施工條件下滑坡體前緣樁間板組合結構變形乃至失效機理,不僅對本工程具有重要意義,而且對類似地質條件下的抗滑樁板墻結構設計及施工也具有示范借鑒意義。楊底下滑坡整體平面上呈"長弓狀"分布,長約225m,寬約440m,面積約0.082km2,體積約176×104m3,主滑方向120°。據(jù)鉆孔和抗滑樁開挖揭露,老滑坡體下部仍保留原巖結構的似層狀結構特點,滑體主要由含粉質粘土夾泥巖碎塊和原有基巖滑體滑動破碎后形成的似層狀巨塊石層組成�；瑤林饕獮楹沉５乃槭�,滑床為白堊系上統(tǒng)灌口組(K2g)泥巖。本文在現(xiàn)場勘查、取樣室內試驗等基礎上,對滑坡前緣局部抗滑樁傾倒失穩(wěn)原因進行了探討,通過正交試驗、采用FLAC3D數(shù)值模擬方法,對滑坡推力、樁間距、樁邊長、彈性模量和泊松比影響樁間土拱效應的程度進行定量分析。在樁間成拱基礎上,先用理論和模擬方法分析土拱拱高,再根據(jù)拱高分析拱前土體產(chǎn)生的土壓力和剩余下滑力,并根據(jù)其較大值來判斷樁間板(墻)所受到的荷載和組合支擋結構的失效機理。最后根據(jù)上述研究成果,對已傾倒抗滑樁提出相應的修復加固治理措施建議。主要研究內容和成果如下:1、通過野外調查,描述說明了楊底下滑坡的工程地質條件和變形破壞特征,并據(jù)此提出其變形失穩(wěn)和形成機制;2、利用極限平衡法、傳遞系數(shù)法分別對老滑坡和推測表層滑坡進行了穩(wěn)定性分析,并描述因烈太產(chǎn)業(yè)新城開建而采用的治理措施;3、研究了抗滑樁與土體之間相互作用的受力模型,并利用正交試驗和FLAC3D數(shù)值模擬分析了滑坡推力、樁間距、樁邊長、彈性模量和泊松比對土拱效應的影響程度;4、分析了土拱效應對樁板墻結構中各個結構物受力分配產(chǎn)生的影響;5、利用FLAC3D和土拱理論分析了抗滑樁組合支擋結構的失效機理;6、根據(jù)上述滑坡體的整體研究和失效部位工程的失效機理,對此失效工程提出了"砂袋堆砌+鋼管樁基礎+竹夾板臨時防護+坡面平整"的綜合治理措施。
[Abstract]:The landslide in Yangxia, Xingjing County, Sichuan, originally belonged to the old landslide. Due to the concentrated settlement of the residents of the Lushan earthquake on 20 April 2013, excavation was carried out on the front edge of the old landslide body. Before the excavation, anti-slide piles were completed, but no plates were hung between the piles.In the flood season of 2015, the soil between piles collapses and collapses, which results in the toppling deformation of some anti-slide piles. (the soil above A6~A9 of anti-slide pile collapses to the top of the original slope slope, and all the overlying structures of A12 and A24 piles collapse and damage the slope of A19 and A24 piles.It is obvious that systematic study on deformation and failure mechanism of composite structure with pile and plate at the front edge of landslide body under complex construction conditions is not only of great significance to this project,It is also of great significance for the design and construction of anti-slide pile-slab wall under similar geological conditions.The whole plane of Yangxia landslide has a "long bow" distribution, which is about 225 m long, 440 m wide, 0.082 km ~ 2 area, 176 脳 10 ~ 4 m ~ 3 volume and 120 擄main slide direction.It is revealed by drilling and anti-slide pile excavation that the lower part of the old landslide still retains the characteristics of the stratiform structure of the original rock structure. The slip body is mainly composed of silty clay mudstone fragments and the similar layered megaclones formed after sliding and breaking of the original skid rock.The slip zone soil is mainly clay grained gravel, and the sliding bed is K2g mudstone of upper Cretaceous Guankou formation.On the basis of site investigation and sampling laboratory test, this paper discusses the causes of the toppling instability of local anti-slide piles at the leading edge of the landslide. Through orthogonal test and FLAC3D numerical simulation method, the thrust of landslide, the spacing of piles, the length of pile side, and so on, are studied.The influence of elastic modulus and Poisson ratio on the soil arch effect between piles was analyzed quantitatively.Based on the arch foundation between piles, the soil arch height is analyzed by theory and simulation method, and then the earth pressure and residual sliding force produced by soil in front of arch are analyzed according to the arch height.The failure mechanism of the composite retaining structure and the load on the pile plate (wall) are judged according to its larger value.Finally, according to the above research results, the paper puts forward the corresponding measures for repairing and strengthening the toppled anti-slide pile.The main research contents and results are as follows: 1. Through field investigation, the engineering geological conditions and deformation-failure characteristics of Yangxia landslide are described, and the deformation instability and formation mechanism of the landslide are put forward, and the limit equilibrium method is used.The transfer coefficient method is used to analyze the stability of the old landslide and the surficial landslide respectively, and to describe the treatment measures adopted for the construction of the new city of Liedai industry. The interaction between the anti-slide pile and the soil is studied.By using orthogonal test and FLAC3D numerical simulation, the thrust of landslide, the distance between piles, the length of pile side are analyzed.The influence degree of elastic modulus and Poisson ratio on soil arch effect is analyzed. The influence of soil arch effect on the distribution of various structures in pile-slab wall structure is analyzed. Using FLAC3D and soil arch theory, the loss of anti-slide pile composite retaining structure is analyzed.According to the overall study of the landslide and the failure mechanism of the failure site engineering,In view of this failure engineering, the comprehensive control measures of "temporary protection of bamboo splint on sand bag pile foundation for slope leveling" are put forward.
【學位授予單位】：西南交通大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：P642.22

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