本文選題：抗滑樁　切入點(diǎn)：地震　出處：《蘭州交通大學(xué)》2017年碩士論文

【摘要】：我國是一個多丘陵、多山地、地形地貌復(fù)雜多樣、山脈起伏較大的國家,山地丘陵約占全國土地總面積的43%。同時,它又是大陸地震最集中,活動性最高的國家之一。因而,研究地震作用下支擋結(jié)構(gòu)的抗震性能具有重要意義。預(yù)應(yīng)力錨索抗滑樁作為一種新型組合支擋結(jié)構(gòu),由于其良好的受力模式和抗滑特性,在工程中到了廣泛的應(yīng)用。但是,目前相對于其工程應(yīng)用,理論研究,尤其對于單錨索抗滑樁的動力特性以及錨索抗滑樁抗震性能優(yōu)化方面的研究報道明顯滯后。為此,本文開展大型振動臺對比試驗(yàn),采用混合加載方式,初步研究了在地震作用下單錨點(diǎn)與多錨點(diǎn)錨索抗滑樁的動力特性及加固邊坡的變形破壞模式。通過數(shù)值模擬,研究了不同向加載時,同一動峰值作用下錨索抗滑樁加固邊坡的位移變形特點(diǎn)。最后,為解決實(shí)際過程中的錨頭失效現(xiàn)象和提高錨索抗滑樁的抗震性能,結(jié)合我國抗震設(shè)計相關(guān)規(guī)范,以及結(jié)構(gòu)抗震方面的參考文獻(xiàn)、工程實(shí)例,對錨索抗滑樁抗震性能提出優(yōu)化,提出了抗震型錨索抗滑樁,并開震振動臺對比試驗(yàn),研究了其優(yōu)化效果研究內(nèi)容和成果:(1)試驗(yàn)1試驗(yàn)現(xiàn)象表明,振動作用下滑體并不一定沿軟弱滑面破壞;坡體坡面的破壞形式為張拉和剪切的復(fù)合破壞。且多錨點(diǎn)錨索抗滑樁加固的邊坡位移較小,有利于控制坡體的進(jìn)一步變形。(2)從震后樁頭水平傾角和水平位移來看,多錨點(diǎn)錨索抗滑樁震后樁頭水平傾角和水平位移較小;(3)輸入的EI-Centro波動峰值加速度越大,錨索抗滑樁的動土壓力峰值越大。從動土壓力分布曲線來看,多錨點(diǎn)錨索抗滑樁在滑面處動土壓力值較小。(4)數(shù)值模擬結(jié)果表明,錨索抗滑樁加固邊坡在加載方式上具有以下特征:Z向加載,坡體后緣位移較大,具有明顯的高程效應(yīng);X向加載,滑面處及以部位下位移較大。雙向加載時,坡體的變形比單向加載要大。隨著動峰值加速度的增大,Z向振動效應(yīng)不斷增強(qiáng),且在坡體變形破壞中發(fā)揮的作用越加顯著。(5)振動臺試驗(yàn)2的震后樁頭水平傾角表明,在錨索抗滑樁錨頭與樁間設(shè)置柔性緩沖層可在一定程度上緩解錨頭失效問題。(6)試驗(yàn)結(jié)果表明:樁后設(shè)置EPS材料可以減小受力側(cè)動土壓力,且其緩沖消能效果跟輸入的動峰值加速度相關(guān),輸入的動峰值加速度越大,緩沖消能效果減弱。當(dāng)輸入的動峰值加速度小于0.6g時優(yōu)化后的錨索抗滑樁抗震性能更好,動土壓力峰值明顯減小,降幅約為50%。(7)通過試驗(yàn)現(xiàn)象及實(shí)測結(jié)果分析得出,上述優(yōu)化措施是行之有效的,可以為高烈度地震區(qū)錨索抗滑樁設(shè)計提供參考。但由于EPS材料剛度較小,實(shí)際工程應(yīng)用中有待進(jìn)一步研究。
[Abstract]:China is a hilly and mountainous country with complicated landforms and undulating mountains. The hilly areas account for about 43% of the total land area in China.At the same time, it is one of the most concentrated and active countries in the continent.Therefore, it is of great significance to study the seismic behavior of retaining structures under earthquake.As a new type of composite retaining structure, prestressed anchor cable anti-slide pile has been widely used in engineering because of its good stress mode and anti-slide characteristics.However, compared with its engineering application, the theoretical research, especially the research on the dynamic characteristics of single anchor cable anti-slide pile and the seismic performance optimization of anchor cable anti-slide pile, is obviously lagging behind.In this paper, a comparative test of large shaking table is carried out, and the dynamic characteristics and deformation failure mode of anti-slide pile with order anchor point and multi-anchor cable under earthquake action are preliminarily studied by using mixed loading method.Through numerical simulation, the displacement and deformation characteristics of the slope strengthened by anchor cable anti-slide pile under the same dynamic peak load are studied.Finally, in order to solve the failure phenomenon of anchor head in the actual process and improve the seismic performance of anchor cable anti-slide pile, combined with the relevant codes for seismic design of our country, as well as the reference of seismic structure, engineering examples,The aseismic performance of anchor cable anti-slide pile is optimized, the anti-slide pile with anti-seismic cable is put forward, and the contrast test of shaking table is carried out. The research contents and results of the research on optimization effect and the result of test 1 show that,The failure of sliding body under vibration is not necessarily along the weak slip surface, but the failure form of slope surface is the composite failure of tensioning and shearing.And the slope displacement strengthened by multi-anchor anchor cable anti-slide pile is smaller, which is helpful to control the further deformation of slope body.) from the angle of horizontal inclination and horizontal displacement of pile head after earthquake,The larger the peak acceleration of EI-Centro wave wave input from the horizontal dip angle and horizontal displacement of pile head after earthquake, the greater the dynamic earth pressure of anchor cable anti-slide pile.From the point of view of the dynamic earth pressure distribution curve, the numerical simulation results show that the slope strengthened by anchor cable anti-slide pile has the following characteristics: Z direction loading, large displacement of the back edge of the slope, and small dynamic earth pressure value of the multi-anchor cable anti-slide pile on the sliding surface.There is obvious height effect in X direction loading, and the displacement is larger at the slip surface and under the position.Under bidirectional loading, the deformation of slope is larger than that of unidirectional loading.With the increase of the dynamic peak acceleration, the effect of Z direction vibration is increasing, and the effect on the deformation and failure of slope body is more and more significant. The horizontal inclination angle of post earthquake pile head in shaking table test 2 shows that,The test results show that the installation of flexible buffer layer between anchor head and pile can alleviate the failure problem of anchor head to some extent. The test results show that the dynamic earth pressure on the side of the pile can be reduced by setting EPS material behind the pile.The effect of buffering energy dissipation is related to the dynamic peak acceleration of input. The larger the dynamic peak acceleration of input is, the weaker the effect of buffer energy dissipation is.When the input dynamic peak acceleration is less than 0.6 g, the seismic performance of the optimized anchor cable anti-slide pile is better, and the peak value of the dynamic earth pressure is obviously reduced, the drop is about 50. 7) through the analysis of the experimental phenomena and the measured results, it is concluded that the above optimization measures are effective.It can provide reference for the design of anchor cable anti-slide pile in high intensity seismic area.However, due to the small stiffness of EPS materials, further research is needed in practical engineering applications.
【學(xué)位授予單位】：蘭州交通大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TU472

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