發(fā)布時間：2018-06-14 08:14

  本文選題：錨桿錨固系統(tǒng) + 坡面框架格梁　； 參考：《蘭州大學》2014年博士論文

【摘要】：歷次地震震害調(diào)查表明,邊坡框架錨桿支護技術(shù)具有良好的抗震性能,然而,目前邊坡框架錨桿錨固系統(tǒng)力學行為及特性研究,尤其是其動力領(lǐng)域極不成熟,嚴重滯后于工程應(yīng)用,開展此項研究,對邊坡錨固工程科學設(shè)計與安全評價均具有重要理論和工程實踐意義。 鑒于此,本文采用理論分析、數(shù)值模擬與工程資料對比驗證等技術(shù)手段,在弄清邊坡錨固系統(tǒng)錨桿靜載拉拔受力機制的基礎(chǔ)上,著重研究邊坡錨固系統(tǒng)錨桿自由振動、錨桿共振效應(yīng)、錨桿受迫振動、錨桿動力固坡效應(yīng)以及坡面框架格梁受迫振動特性等。通過系統(tǒng)分析,得到以下幾點認識： 根據(jù)界面二階段黏滑本構(gòu)模型假定,推導了錨桿拉拔臨界松動荷載理論公式、錨桿拉拔荷載與松動長度內(nèi)在關(guān)系表達式；依據(jù)界面抗剪強度與殘余強度之間大小關(guān)系,將錨桿拉拔松動破壞類型劃分為漸進式和突發(fā)式兩種類型,并給出了破壞類型定量判別標準及其所對應(yīng)的錨桿拉拔極限荷載理論解；同時,以此為基礎(chǔ),給出了層狀地層錨桿、缺陷錨桿錨固迭代計算方法與求解步驟,并開展此兩種復(fù)雜情形下錨桿拉拔力學行為及特性分析。 基于一定假定,建立了邊坡錨固系統(tǒng)錨桿自由振動力學模型,給出了錨固系統(tǒng)自由振動控制方程及其邊界條件；分別推導了無阻尼和有阻尼情形下有關(guān)系統(tǒng)固有頻率或特征參數(shù)、振型理論計算公式；結(jié)合錨固工程抗震設(shè)防要求,給出了確定場地錨固工程危險區(qū)域與共振錨桿設(shè)計圖譜的計算方法；同時,通過參數(shù)靈敏度分析,進一步揭示了影響錨固系統(tǒng)無阻尼固有頻率和有阻尼特征參數(shù)的主要因素及其內(nèi)在規(guī)律。 基于錨桿微段動力受力分析,給出了錨固系統(tǒng)錨桿受迫振動動力平衡方程；分別推導了無阻尼和有阻尼情形錨桿簡諧受迫振動力學響應(yīng)理論解,同時還建立了錨桿受迫振動響應(yīng)具體的有限差分格式,并結(jié)合MATLAB編程技術(shù)使其程序化,通過算例,相互驗證方法的可行性與正確性,并指出了各方法的優(yōu)劣及錨固系統(tǒng)錨桿受迫振動力學響應(yīng)分析計算方法的選取原則；通過算例分析,揭示了在水平地震荷載作用下錨桿動力響應(yīng)規(guī)律。 通過FLAC數(shù)值模擬,在重新審視地震邊坡巖土體變形破壞機制的基礎(chǔ)上,通過不同工況下地震邊坡位移場、應(yīng)力場及典型單元應(yīng)力狀態(tài)的對比分析,進行了地震邊坡加錨效應(yīng)分析；同時,通過錨桿動力固坡效應(yīng)參數(shù)影響分析,提出了一些指導邊坡錨固工程抗震設(shè)計的參考建議。 基于一定假定,建立了坡面框架格梁支護結(jié)構(gòu)動力力學模型,推導了框架豎梁受迫振動動力平衡控制方程；獲得了錨固系統(tǒng)無阻尼和有阻尼情形豎梁簡諧受迫振動動力力學響應(yīng)理論解析解；同時,根據(jù)有限差分原理,建立了框架豎梁受迫振動響應(yīng)具體的有限差分格式及其計算流程,并采用MATLAB編程技術(shù)使其程序化；通過算例相互驗證方法的可行性與正確性,并指出了各方法的計算特點；通過算例分析,揭示了在水平地震荷載作用下豎梁動力響應(yīng)規(guī)律。
[Abstract]:The seismic damage investigation shows that the slope frame anchor bolt support technology has good seismic performance , however , the mechanical behavior and characteristics of the anchor rod anchoring system in the present slope frame , especially its power field , is extremely immature , which lags behind the engineering application seriously , and carries out the research , and has important theoretical and practical significance for the scientific design and safety evaluation of the slope anchoring engineering .

Based on the theory analysis , numerical simulation and comparative validation of engineering data , this paper focuses on the study of free vibration of anchor rod of slope anchoring system , the resonance effect of anchor rod , the forced vibration of anchor rod , the dynamic slope effect of anchor rod and the forced vibration characteristics of slope surface frame lattice beam .

Based on the assumption of the interface two - phase slip constitutive model , the theoretical formula of the critical loose load of the anchor rod is deduced , and the relationship expression between the pull - out load and the loose length of the anchor rod is deduced .
According to the relationship between shear strength and residual strength of the interface , the types of fracture types are divided into progressive and burst types , and the criterion of damage type and the theoretical solution of the ultimate load of anchor rod are given .
At the same time , on the basis of this , the iterative calculation method and the solution procedure of the anchor bolt and the anchor of the defective anchor rod are given , and the mechanical behavior and characteristic analysis of the anchor bolt are carried out under the two complex situations .

Based on the assumption , the mechanical model of free vibration of anchor rod of slope anchoring system is established , and the control equation of free vibration of anchorage system and its boundary conditions are given .
The natural frequency or characteristic parameters of the system under the condition of undamped and damping are derived respectively , and the formula of vibration mode is calculated .
Combined with the seismic fortification requirements of anchorage engineering , a calculation method for determining the dangerous area of site anchoring project and the design map of resonance anchor rod is given .
At the same time , through the analysis of the sensitivity of the parameters , the main factors and the inherent law of the undamped natural frequency and damping characteristic parameters of the anchorage system are further revealed .

Based on the analysis of dynamic force of anchor bolt micro - section , the dynamic equilibrium equation of anchor system anchor rod is given .
In this paper , the mechanical response theory of undamped and damped bolt is deduced , and the specific finite difference scheme is also established . The feasibility and validity of the method are verified by using MATLAB programming technique , and the selection principles of the method are pointed out .
By means of an example analysis , the dynamic response law of the anchor rod under the action of horizontal seismic load is revealed .

Based on the simulation of FLAC numerical simulation , based on the re - examination of the deformation and failure mechanism of the rock and soil body of the seismic slope , the seismic slope and anchor effect analysis is carried out by comparing the displacement field , the stress field and the stress state of the typical unit under different working conditions .
At the same time , some reference suggestions to guide the anti - seismic design of slope anchoring engineering are put forward by analyzing the influence of the dynamic slope effect parameters of the anchor rod .

Based on the assumption , the dynamic mechanical model of grid beam supporting structure is established , and the dynamic balance control equation of the frame vertical beam is deduced .
The analytical solution of the dynamic mechanical response of the vertical beam with no damping and damping in the anchorage system is obtained .
At the same time , according to the finite difference principle , the finite difference scheme of the frame vertical beam forced vibration response and its calculation flow are established , and the program is programmed by MATLAB programming technique .
The feasibility and validity of the mutual verification method are verified , and the calculation characteristics of each method are pointed out .
Through an example analysis , the dynamic response law of the vertical beam under the action of horizontal seismic load is revealed .
【學位授予單位】：蘭州大學
【學位級別】：博士
【學位授予年份】：2014
【分類號】：TU476

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本文編號：2016707