發(fā)布時間：2018-06-14 22:29

  本文選題：樁錨體 + 預應力錨索抗滑樁　； 參考：《湖南科技大學》2015年碩士論文

【摘要】：預應力錨索抗滑樁是一種廣泛應用于邊坡支護體系的支擋結構,是抗滑支擋結構的優(yōu)化組合,具有提供的錨固力大,結構可靠、安全的特點,但其設計理論及錨索的工程性狀分析尚不完善,本文結合已有預應力錨索受力機理研究成果,依托郴州某滑坡治理分析預應力錨索及樁錨體的工程應用以及工程性質。運用理論分析和有限元驗證相結合的方法研究預應力錨索抗滑樁在滑坡推力下的變形特性,以及錨索受力情況,借助于ANSYS軟件對工程實際施工過程中,邊坡巖土體的變形和錨索抗滑樁進行內力計算。本文首先對滑坡推力及地基反力在抗滑樁樁體上的分布情況進行理論分析,根據相關規(guī)范,介紹對應的計算方法;分析現有錨索抗滑樁力學模型的現狀并指出其中存在的問題,分析錨索抗滑樁的結構受力和預應力錨索抗滑樁的主要參數確定方法,介紹錨索抗滑樁設計包括的設計內容,并分析其不同情況下的計算方法。然后通過對郴州某滑坡的工程治理,對錨索抗滑樁的設計原則、設計步驟及設計方法進行特例分析,對施工過程進行動態(tài)監(jiān)測,根據監(jiān)測結果分析滑坡的原因以及發(fā)展過程,得到了滑坡的形成以及之后的加劇下滑過程,不僅僅有當地復雜的地質原因,還有施工過程中人為的因素對邊坡造成不利影響。比如施工過程中,沒有考慮開挖施工對滑坡體的破壞,使用不恰當的開挖方式,坡腳開挖后未及時支護,抗滑樁施工時挖樁密度過大,滑坡體自身穩(wěn)定性破壞過大,未及時控制住變形,不僅沒有起到支護作用,而且使滑坡體穩(wěn)定性更低,加劇了滑坡。因此,在治理滑坡時,治理過程穩(wěn)定性對滑坡治理的成功與否起著重要的作用,通過比較不同的施工方式對滑坡產生的治理效果差異,確定施工過程中施工方式的重要性。根據設計規(guī)范和勘察報告,結合滑坡類型、變形特征、危害對象及穩(wěn)定性分析,確定對其采用“抗滑樁+錨索+截排水+降水井+注漿+裂縫填埋+輔助措施”相結合的綜合工程治理方案。施工錨索抗滑樁時,注意施工方法,設計采用3序施工法施工抗滑樁,跳挖法和邊開挖邊支護結合起來,盡量減少開挖抗滑樁時對坡體穩(wěn)定性的破壞。分析動態(tài)監(jiān)測結果,確定滑坡治理時滑坡的滑動趨勢,及時做出調整,確保施工過程中邊坡的穩(wěn)定性及施工質量。最后使用ANSYS軟件分析滑坡開挖未支護的受力應變趨勢,再次分析使用錨索抗滑樁以及普通抗滑樁的支護效果,計算抗滑樁及錨索在支護體系中的受力和應變情況,并和監(jiān)測結果進行對比,得出ANSYS分析結果和監(jiān)測結果基本吻合,使用ANSYS軟件能夠方便、直觀的表現出滑坡體及抗滑樁應變性能。
[Abstract]:Pre-stressed anchor cable anti-slide pile is a kind of retaining structure widely used in slope support system. It is an optimized combination of anti-slide retaining structure, which has the characteristics of large anchoring force, reliable structure and safety. However, the design theory and the analysis of the engineering character of the anchor cable are not perfect. In this paper, the engineering application and the engineering properties of the prestressed anchor cable and the pile anchor body are analyzed based on the existing research results of the stress mechanism of the prestressed anchor cable and the pile anchor body based on the treatment of a landslide in Chenzhou. The deformation characteristics of prestressed anchor cable anti-slide pile under the thrust of landslide and the stress of anchor cable are studied by using the method of theoretical analysis and finite element verification, and the actual construction process of the project is carried out by means of ANSYS software. The deformation of slope and soil mass and the internal force of anchor cable anti-slide pile are calculated. In this paper, the distribution of landslide thrust force and foundation reaction force on anti-slide pile body is analyzed theoretically, the corresponding calculation method is introduced according to relevant codes, the present situation of the existing mechanical model of anchor cable anti-slide pile is analyzed and the existing problems are pointed out. This paper analyzes the structural force of anchor cable anti-slide pile and the main parameter determination method of prestressed anchor cable anti-slide pile, introduces the design contents of anchor cable anti-slide pile, and analyzes the calculation methods under different conditions. Then through the engineering treatment of a landslide in Chenzhou, the design principles, design steps and design methods of anchor cable anti-slide pile are analyzed, and the dynamic monitoring of construction process is carried out. According to the monitoring results, the causes and development process of landslide are analyzed. The formation of the landslide and the subsequent process of increasing the slide are not only caused by the local complex geological reasons but also by the man-made factors in the construction process which have a negative impact on the slope. For example, in the construction process, the failure of excavation to the landslide body is not considered, the improper excavation method is used, the slope foot is not supported in time after excavation, the density of the excavated pile is too large during the construction of the anti-slide pile, and the stability of the landslide body itself is destroyed too much. Failure to control the deformation in time not only does not play a supporting role, but also makes the landslide less stable and intensifies the landslide. Therefore, the stability of the control process plays an important role in the landslide control. The importance of the construction mode in the construction process is determined by comparing the different construction methods to the landslide treatment effects. According to the design code and survey report, combined with landslide type, deformation characteristics, hazard object and stability analysis, It is determined that the comprehensive engineering treatment scheme should be adopted in combination with "auxiliary measures of grouting fracture landfill for anti-slide pile Anchorage cable intercepting drainage dewatering well". In the construction of anti-slide pile with anchor cable, attention should be paid to the construction method, and the three-sequence construction method should be used to construct the anti-slide pile. The method of jumping and digging is combined with the side excavation to reduce the damage to the stability of the slope body during the excavation of the anti-slide pile as far as possible. The dynamic monitoring results are analyzed to determine the sliding trend of the landslide and to make timely adjustments to ensure the stability and construction quality of the slope during the construction process. Finally, the stress and strain trend of unsupported landslide excavation is analyzed by ANSYS software, and the support effect of anti-slide pile with anchor cable and common anti-slide pile is analyzed again, and the stress and strain of anti-slide pile and anchor cable in support system are calculated. And compared with the monitoring results, the results of ANSYS analysis and monitoring results are basically consistent, the use of ANSYS software can be convenient, intuitive performance of landslide and anti-slide pile strain performance.
【學位授予單位】：湖南科技大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：P642.22;TU473.1

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本文編號：2019186