【摘要】：隨著經(jīng)濟(jì)建設(shè)發(fā)展和全球氣候變化,威脅人們生命財(cái)產(chǎn)安全的大型滑坡越來越多。在滑坡治理工程中,能提供較大抗滑力的雙排抗滑樁得到了廣泛的應(yīng)用。但雙排抗滑樁受力機(jī)理及其影響因素的研究一直落后于應(yīng)用,很多實(shí)際工程只能借鑒單排抗滑樁的設(shè)計(jì)經(jīng)驗(yàn)。本文以實(shí)際工程監(jiān)測數(shù)據(jù)為基礎(chǔ),利用理論分析和數(shù)值模擬方法,建立能夠考慮雙排抗滑樁間“遮蔽效應(yīng)”的計(jì)算模型；研究雙排抗滑樁不同錨固深度組合對(duì)雙排抗滑樁變形、內(nèi)力、樁側(cè)土壓力和雙排抗滑樁抗滑力的影響；探討施工時(shí)間差對(duì)雙排抗滑樁內(nèi)力的影響；研究簡便易行的抗滑樁裂縫判別方法,并對(duì)豎向預(yù)應(yīng)力在抗滑樁中的應(yīng)用進(jìn)行系統(tǒng)的研究與驗(yàn)證,主要研究內(nèi)容如下： (1)在假設(shè)滑體位移沿深度均勻分布的前提下,引入前排樁與后排樁樁周土體位移比,結(jié)合彈性地基梁理論,建立基于土體位移的有連梁雙排抗滑樁理論計(jì)算模型.基于理論模型的解析解,利用Matlab編程,對(duì)雙排抗滑樁的內(nèi)力進(jìn)行計(jì)算,并通過FLAC3D有限差分模型進(jìn)行驗(yàn)證。 (2)基于FLAC3D有限差分模型,探討不同錨固深度組合對(duì)無連粱和有連梁雙排剛性抗滑樁變形、內(nèi)力、抗滑力和樁側(cè)土壓力的影響。 (3)基于彈性地基梁理論,建立考慮施工時(shí)間差的雙排抗滑樁計(jì)算模型,結(jié)合紅巖滑坡的工程實(shí)測數(shù)據(jù),研究施工時(shí)間差對(duì)雙排抗滑樁內(nèi)力的影響。 (4)依據(jù)以樁頂位移為參量的抗滑樁計(jì)算模型,結(jié)合混凝土理論,提出一種基于樁頂位移的裂縫判別方法,用于判斷抗滑樁中混凝土出現(xiàn)裂縫的時(shí)間及位置,并通過實(shí)測數(shù)據(jù)對(duì)判別模型進(jìn)行驗(yàn)證。 (5)基于前人對(duì)豎向預(yù)應(yīng)力抗滑樁的研究,提出依據(jù)樁頂位移施加預(yù)應(yīng)力的具體方法,實(shí)現(xiàn)對(duì)抗滑樁裂縫防治的動(dòng)態(tài)控制,同時(shí)驗(yàn)證豎向預(yù)應(yīng)力在實(shí)際工程中的可行性。 通過上述研究,得到以下幾點(diǎn)創(chuàng)新性結(jié)論： (1)基于土體位移的雙排抗滑樁計(jì)算模型,通過前排抗滑樁與后排抗滑樁樁周土體位移比來考慮“遮蔽效應(yīng)”是可行的。相比基于土壓力的計(jì)算模型,基于位移的計(jì)算模型更容易得到解析解； (2)錨固深度對(duì)內(nèi)力、變形、抗滑力和樁側(cè)土壓力有明顯影響,且此影響與所施加的邊界位移大小有關(guān)； (3)施工時(shí)間差對(duì)雙排抗滑樁內(nèi)力與變形有明顯的影響,尤其是對(duì)先施工的后排抗滑樁。根據(jù)前后排抗滑樁最大拉應(yīng)力比值接近,且最大彎矩之和最小,能夠?qū)崿F(xiàn)施工時(shí)間差的優(yōu)化； (4)利用基于樁頂位移的裂縫判別式,對(duì)紅巖滑坡抗滑樁裂縫出現(xiàn)的時(shí)間及位置進(jìn)行了判斷,通過鋼筋應(yīng)力數(shù)據(jù)對(duì)判斷結(jié)果進(jìn)行驗(yàn)證,證明了本文提出的裂縫判別式的可行性和準(zhǔn)確性； (5)確定了根據(jù)樁頂位移對(duì)抗滑樁施加豎向預(yù)應(yīng)力能夠?qū)崿F(xiàn)對(duì)抗滑樁裂縫的動(dòng)態(tài)控制。
[Abstract]:With the development of economic construction and global climate change, there are more and more large landslides threatening people's lives and property. In landslide control engineering, double row anti-slide pile which can provide large anti-slide force has been widely used. However, the research on the mechanics and influencing factors of double-row anti-slide piles has been lagging behind the application, and many practical projects can only draw lessons from the design experience of single-row anti-slide piles. Based on the actual engineering monitoring data, this paper establishes a calculation model which can take into account the "shielding effect" between double-row anti-slide piles by using theoretical analysis and numerical simulation method, and studies the deformation of double-row anti-slide piles with different anchoring depth combinations. The influence of internal force, soil pressure on pile side and anti-slide force of double-row anti-slide pile; discuss the influence of construction time difference on internal force of double-row anti-slide pile; study the simple and easy method to judge the crack of anti-slide pile, The application of vertical prestress in anti-slide pile is systematically studied and verified. The main contents are as follows: (1) under the assumption of uniform distribution of sliding body displacement along the depth, the displacement ratio of soil around the front row pile and the back row pile is introduced. Based on the theory of elastic foundation beam, the theoretical calculation model of double-row anti-slide piles with connected beams is established based on soil displacement. Based on the analytical solution of the theoretical model, the internal force of the double-row anti-slide pile is calculated by Matlab programming, and verified by the FLAC3D finite difference model. (2) based on the FLAC3D finite difference model, The effects of different anchoring depth combinations on deformation, internal force, anti-slide force and soil pressure of pile side are discussed. (3) based on the theory of elastic foundation beam, The calculation model of double-row anti-slide pile considering the construction time difference is established, and the influence of the construction time difference on the internal force of the double-row anti-slide pile is studied in combination with the measured data of Hongyan landslide. (4) based on the calculation model of anti-slide pile with the displacement of the pile top as the parameter, Combined with concrete theory, a crack discrimination method based on pile top displacement is proposed, which can be used to judge the time and position of concrete crack in anti-slide pile. The discriminant model is verified by the measured data. (5) based on the previous research on the vertical prestressed anti-slide pile, the concrete method of applying prestressing force according to the displacement of the pile top is put forward to realize the dynamic control of anti-slide pile crack prevention. At the same time, the feasibility of vertical prestress in practical engineering is verified. Through the above research, some innovative conclusions are obtained as follows: (1) the calculation model of double-row anti-slide pile based on soil displacement is feasible to consider the "shielding effect" through the ratio of soil displacement around the front row anti-slide pile and the back row anti-slide pile. Compared with the calculation model based on earth pressure, the model based on displacement is easier to obtain analytical solution. (2) Anchorage depth has obvious influence on internal force, deformation, anti-slide force and soil pressure on pile side. This effect is related to the magnitude of the boundary displacement applied. (3) the construction time difference has obvious influence on the internal force and deformation of the double-row anti-slide pile, especially on the post-row anti-slide pile. According to the ratio of maximum tensile stress is close and the sum of maximum moment is minimum, the construction time difference can be optimized. (4) the crack discriminant based on pile top displacement is used. The time and position of cracks of anti-slide pile in Hongyan landslide are judged, and the results are verified by the data of steel bar stress, which proves the feasibility and accuracy of the crack discriminant proposed in this paper. (5) the dynamic control of anti-slide pile crack can be realized by applying vertical prestressing force according to the displacement of the pile top.
【學(xué)位授予單位】：浙江大學(xué)
【學(xué)位級(jí)別】：博士
【學(xué)位授予年份】：2013
【分類號(hào)】：TU473.1

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