【摘要】：近年來(lái),滑坡在高速公路及高速鐵路工程中所占的比例越來(lái)越大,因而諸多學(xué)者對(duì)滑坡形成機(jī)理及治理措施的研究越來(lái)越多,特別是對(duì)特殊土體滑坡穩(wěn)定性的研究更是久盛不衰。本文以十天高速漢中西勉縣檢測(cè)站膨脹土滑坡為背景,對(duì)膨脹土多滑坡的治理進(jìn)行分析研究,通過(guò)錨索抗滑樁的變形特點(diǎn)、測(cè)斜孔的變化特點(diǎn)以及地表位移的變化特點(diǎn)來(lái)制定該地區(qū)滑坡的治理措施。最后,利用Midas/GTS NX軟件對(duì)該滑坡進(jìn)行支護(hù)分析,通過(guò)支護(hù)結(jié)果分析優(yōu)化模型,以便在最經(jīng)濟(jì)的條件下達(dá)到最好的防護(hù)效果。本文主要研究?jī)?nèi)容有如下幾個(gè)方面:(1)查閱相關(guān)文獻(xiàn),了解有關(guān)膨脹土滑坡的研究現(xiàn)狀,明確膨脹土自身的工程特性和影響膨脹土產(chǎn)生滑坡的因素以及膨脹土滑坡的失穩(wěn)機(jī)理。(2)根據(jù)現(xiàn)場(chǎng)實(shí)際情況制定滑坡監(jiān)測(cè)方案�，F(xiàn)場(chǎng)選取兩條主軸斷面進(jìn)行深孔位移監(jiān)測(cè),預(yù)設(shè)監(jiān)測(cè)鉆孔6個(gè),孔深40m,通過(guò)監(jiān)測(cè)數(shù)據(jù)繪制S-W-T圖,對(duì)比分析各鉆孔孔口位移和水位埋深隨時(shí)間的變化規(guī)律以及各鉆孔水平位移隨深度的變化規(guī)律。在錨索抗滑樁樁背一側(cè)布設(shè)土壓力盒,測(cè)出抗滑樁樁后土壓力值;在抗滑樁受拉和受壓側(cè)主筋上對(duì)稱(chēng)設(shè)置鋼筋計(jì)測(cè)出抗滑樁主筋內(nèi)力,從而可以反算出抗滑樁樁身彎矩。(3)根據(jù)現(xiàn)場(chǎng)實(shí)際土層及支護(hù)情況用MIDAS GTS建立二維有限元模型,得出抗滑樁在單排樁、雙排樁、三排樁支護(hù)情況下樁身水平位移分別為4.71cm、4.48cm、4.20cm。同時(shí)也得出樁身彎矩隨深度的分布規(guī)律,以及潛在滑裂面的位置和加固后的滑坡安全系數(shù)。將計(jì)算得到的抗滑樁樁身水平位移和樁身彎矩與現(xiàn)場(chǎng)實(shí)測(cè)結(jié)果進(jìn)行對(duì)比,兩者結(jié)果基本一致,可見(jiàn)合理的有限元模型可以有效的描述現(xiàn)場(chǎng)滑坡在施工過(guò)程中內(nèi)力和變形機(jī)理。(4)最后通過(guò)改變抗滑樁的排數(shù),研究了在不同抗滑樁設(shè)計(jì)方案下,滑坡在施工過(guò)程中的受力及變形機(jī)理。最后得比各抗滑樁設(shè)計(jì)方案下的安全系數(shù)分別為1.1、1.15、1.35、1.61,得知不設(shè)抗滑樁時(shí)的安全系數(shù)最低,設(shè)置三排樁的安全系數(shù)最高,考慮到實(shí)際的經(jīng)濟(jì)性,設(shè)置兩排樁最為合理。
[Abstract]:In recent years, the proportion of landslide in expressway and high-speed railway projects is increasing, so many scholars have studied more and more landslide formation mechanism and treatment measures. Especially the study on the stability of special soil landslide is even more prosperous. In this paper, based on the landslide of expansive soil at the test station in Mian County, Hanzhong County, ten days high speed, the treatment of multiple landslide of expansive soil is analyzed and studied, and the deformation characteristics of anti-slide pile with anchor cable are analyzed and studied in this paper. The change characteristics of slanting hole and the change of surface displacement are used to make the treatment measures of landslide in this area. Finally, Midas / GTS NX software is used to analyze the landslide support, and the model is optimized by analyzing the supporting results, so as to achieve the best protective effect under the most economical conditions. The main contents of this paper are as follows: (1) referring to the relevant literature, to understand the research status of expansive soil landslide, The engineering characteristics of expansive soil itself, the factors influencing the landslide of expansive soil and the instability mechanism of expansive soil landslide are clarified. (2) according to the actual situation on the spot, the landslide monitoring scheme is established. Two main shaft sections were selected to monitor the displacement of deep hole. Six holes were preset monitored, and the hole depth was 40m. The S-W-T map was drawn by monitoring data. The variation law of hole displacement and water level depth with time and horizontal displacement with depth of borehole are compared and analyzed. The earth pressure box is arranged on the back side of the anchor cable anti-slide pile to measure the value of the earth pressure after the anti-slide pile, and the internal force of the main reinforcement of the anti-slide pile is measured by symmetrically setting the reinforcing bar on the tension and compression side of the anti-slide pile. Therefore, the bending moment of anti-slide pile can be calculated back. (3) according to the actual soil layer and supporting condition, the two-dimensional finite element model of anti-slide pile is established by Midas GTS, and the horizontal displacement of anti-slide pile in single row pile, double row pile and three row pile support is 4.71 cm ~ 4.48 cm ~ (-1) ~ 4.20 cm ~ (-1) respectively. At the same time, the distribution law of pile bending moment with depth, the location of potential slip surface and the safety factor of reinforced landslide are also obtained. The calculated horizontal displacement and bending moment of anti-slide pile body are compared with the measured results, and the results are basically the same. It can be seen that the reasonable finite element model can effectively describe the internal force and deformation mechanism of the landslide in the construction process. (4) finally, by changing the number of anti-slide piles, the different anti-slide pile design schemes are studied. Stress and deformation mechanism of landslide during construction. Finally, the safety factor of each design scheme is 1.1l / 1.15 / 1.35 / 1.61respectively. It is known that the safety coefficient is the lowest when the anti-slide pile is not set, and the safety coefficient of the three rows of piles is the highest. Considering the actual economy, it is most reasonable to set up two rows of piles.
【學(xué)位授予單位】：蘭州交通大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類(lèi)號(hào)】：U418.55

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