【摘要】：本文針對南水北調(diào)中線工程河南南陽段渠坡開挖施工中出現(xiàn)膨脹土滑坡的問題,利用有限元方法對深挖方膨脹土渠坡滑塌機(jī)理及采用抗滑樁后的抗滑機(jī)理進(jìn)行了數(shù)值模擬和分析。主要考慮了膨脹土在干濕循環(huán)作用下土體軟化和土體膨脹兩方面的影響因素,分析了干濕循環(huán)對渠坡滑坡的影響和對抗滑措施作用效果的影響,從邊坡土體位移變化、塑性應(yīng)變,以及抗滑樁的應(yīng)力、應(yīng)變以及樁土之間的土拱效應(yīng)幾個方面進(jìn)行了分析,探討了在于濕循環(huán)作用下抗滑樁的最佳施工時機(jī)以及抗滑措施。具體內(nèi)容如下：首先,基于室內(nèi)試驗獲得了模型分析的樁、土基本參數(shù),主要是土水特征曲線、強(qiáng)度參數(shù)、膨脹力參數(shù)和彈性模量以及泊阿松比；接著,結(jié)合河南南陽自然氣候條件,在降雨滲流分析理論的基礎(chǔ)上,對南陽二標(biāo)渠坡進(jìn)行了干濕循環(huán)區(qū)域的仿真計算,分析了干濕循環(huán)作用下,不同時期干濕循環(huán)影響區(qū)域的范圍,并對影響區(qū)域進(jìn)行了分層,結(jié)合試驗和已有文獻(xiàn),采用類比方法,確定了干濕循環(huán)影響區(qū)域不同層的土體強(qiáng)度參數(shù)和影響區(qū)域土體吸水產(chǎn)生的膨脹力大��；然后,以非飽和土抗剪強(qiáng)度理論和強(qiáng)度折減法為基礎(chǔ),對南陽二標(biāo)渠坡進(jìn)行三維渠坡模型的建立,從應(yīng)力、應(yīng)變、土體位移等方面分析了膨脹土渠坡發(fā)生深層滑坡的機(jī)理,表明了沿軟弱結(jié)構(gòu)面易發(fā)生較平緩的深層滑坡,并且通過研究不同時期干濕循環(huán)作用下的渠坡,得到了抗滑樁施工的最佳時機(jī)。最后,將干濕循環(huán)影響下土體軟化、土體膨脹與具有抗滑樁膨脹土渠坡結(jié)合起來,從土體位移、樁身位移、樁身受力以及樁土之間的土拱效應(yīng)幾個方面對渠坡進(jìn)行抗滑作用機(jī)理分析,得出抗滑樁作用于深層渠坡的優(yōu)缺點,提出渠坡深層抗滑的措施,但同時也說明了抗滑樁不能進(jìn)行淺層抗滑,要對膨脹土進(jìn)行淺層抗滑需要其它方法,如：淺表層土質(zhì)改良或者進(jìn)行防水措施。
[Abstract]:Aiming at the problem of expansive soil landslide in excavation construction of canal slope in Nanyang section of Henan Province in the middle route of South-to-North Water transfer Project, The mechanism of sloughing of expansive soil channel slope in deep excavation and the anti-slide mechanism of anti-slide pile are simulated and analyzed by finite element method (FEM). This paper mainly considers the influence factors of soil softening and soil swelling under dry and wet circulation, analyzes the influence of dry and wet circulation on channel slope landslide and the effect of anti-slide measures, and changes the displacement of slope soil. Plastic strain, stress and strain of anti-slide pile and soil arch effect between pile and soil are analyzed, and the optimum construction time and anti-slide measure of anti-slide pile under wet circulation are discussed. The main contents are as follows: firstly, the basic parameters of soil, such as soil water characteristic curve, strength parameter, expansion force parameter and elastic modulus and Poisson's ratio, are obtained based on the indoor test. Combined with the natural climate conditions in Nanyang, Henan Province, on the basis of the theory of rainfall seepage analysis, the dry and wet circulation region of Nanyang second standard canal slope was simulated and calculated, and the range of dry and wet circulation affected areas in different periods was analyzed. The soil strength parameters of different layers in the affected area and the swelling force of the soil mass in the region affected by dry and wet circulation are determined by analogy method, combined with the experiment and the existing literature. Based on the shear strength theory of unsaturated soil and the strength reduction method, the three-dimensional model of channel slope in Nanyang Erbiao channel is established. The mechanism of deep landslide in expansive soil canal slope is analyzed from the aspects of stress, strain and soil displacement. The results show that the deep landslide is easy to occur along the weak structural plane, and the optimum time for the construction of anti-slide pile is obtained by studying the channel slope under the action of dry and wet circulation in different periods. Finally, soil is softened under the influence of dry and wet circulation, and soil swelling is combined with expansive soil channel slope with anti-slide pile. Based on the analysis of the anti-slide mechanism of the pile and the soil arch effect between the piles and soil, the advantages and disadvantages of the anti-slide pile acting on the deep channel slope are obtained, and the measures for the deep slide resistance of the canal slope are put forward. But at the same time, it also shows that anti-slide pile can not be used in shallow layer, and other methods are needed to resist sliding in shallow layer of expansive soil, such as improving the quality of shallow surface soil or waterproofing measures.
【學(xué)位授予單位】：長沙理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：TV68;TV553

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