【摘要】：由于地質(zhì)環(huán)境的復(fù)雜以及人們對錨桿作用機理的研究不夠深入,缺少行之有效的、合理的計算模型,對錨固參數(shù)估算不準(zhǔn)確等因素的限制,使錨桿支護設(shè)計存在一定的局限性;另一方面,由于錨桿工程結(jié)構(gòu)具有隱蔽性和施工工序相對較為復(fù)雜以及施工隊伍操作水平層次不齊等特點,這些可能影響到整個巖土工程結(jié)構(gòu)的質(zhì)量和長期穩(wěn)定安全,控制錨桿施工質(zhì)量也存在一定難度�；诖�,錨桿機理研究,錨固參數(shù)優(yōu)化和錨桿質(zhì)量檢測水平仍然需要進一步研究和嘗試。本文在前人研究成果的基礎(chǔ)上,結(jié)合廣東省南粵交通揭(陽)惠(來)高速公路建設(shè)項目中小北山1#隧道工程實際,基于對隧道圍巖穩(wěn)定性的研究及全長粘結(jié)式砂漿錨桿的支護機理的研究,引入均勻設(shè)計試驗方法,建立隧道開挖襯砌錨桿支護有限差分?jǐn)?shù)值模型。分別以錨桿長度L,直徑D,布設(shè)間距Sx,布設(shè)排距Sr為影響因素,參考規(guī)范建議選取6個水平,以拱頂位移、周邊收斂值、圍巖最大主應(yīng)力和錨桿最大軸力為因變量,采用向后逐步回歸法對數(shù)值模擬結(jié)果進行回歸分析,得到不同錨固參數(shù)對于錨桿支護效果的影響,并優(yōu)選出最佳的錨桿支護方案,為隧道錨桿設(shè)計提供有意義的參考。同時基于應(yīng)力波的理論基礎(chǔ),研究錨桿錨固質(zhì)量檢測的技術(shù)方法和應(yīng)力波在一維錨桿中傳播時波動方程,探討了應(yīng)力波在錨桿中的傳播規(guī)律,根據(jù)錨桿無損檢測的內(nèi)容,探討應(yīng)力波法的判斷方法和依據(jù)。結(jié)合現(xiàn)場實際工程應(yīng)用,使用應(yīng)力波法對錨桿施工質(zhì)量作出評價,指導(dǎo)施工。
[Abstract]:Because of the complexity of geological environment and the lack of deep research on the mechanism of bolt action, the lack of effective and reasonable calculation model and the limitation of inaccurate estimation of anchor parameters, there are some limitations in bolt support design. On the other hand, because of its concealment, relatively complex construction procedure and uneven operation level of the construction team, these may affect the quality and long-term stability and safety of the whole geotechnical engineering structure. It is also difficult to control the construction quality of anchor rod. Based on this, the study of anchor mechanism, the optimization of anchoring parameters and the level of anchor quality inspection still need further study and attempt. On the basis of the previous research results, this paper combines the reality of the small Beishan 1# Tunnel Project in Guangdong Province's Nanzhou-Guangdong Jiaotong (Yang) Hui (Lai) Expressway Construction Project. Based on the study of the stability of surrounding rock of tunnel and the supporting mechanism of full-length bonded mortar bolt, the finite difference numerical model of tunnel excavation lining bolting is established by introducing the uniform design test method. In this paper, the length of anchor rod L, diameter D, arrangement distance Sr of Sx, spacing are taken as the influencing factors, and the six levels are suggested to be selected according to the specification. The dependent variables are arch displacement, peripheral convergence value, maximum principal stress of surrounding rock and maximum axial force of anchor rod. The regression analysis of the numerical simulation results is carried out by using the backward stepwise regression method. The influence of different anchoring parameters on the bolting effect is obtained, and the optimal bolting scheme is selected, which provides a meaningful reference for the tunnel bolt design. At the same time, based on the theoretical basis of stress wave, the technical method of anchor anchoring quality detection and wave equation of stress wave propagating in one-dimensional anchor are studied, and the propagation law of stress wave in anchor rod is discussed, according to the content of non-destructive testing of anchor rod, The judgment method and basis of stress wave method are discussed. The stress wave method is used to evaluate the construction quality of anchor rod and guide the construction.
【學(xué)位授予單位】：華中科技大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：U455.7;U456.3

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