發(fā)布時(shí)間：2018-09-13 15:33

【摘要】：在現(xiàn)有的抗滑樁設(shè)計(jì)中,一般是把抗滑樁設(shè)置于滑面平緩的地段,將嵌固段視為半無限空間,并以此來進(jìn)行抗滑樁嵌固深度的設(shè)計(jì)和穩(wěn)定性計(jì)算。當(dāng)斜坡場(chǎng)地的抗滑樁嵌固段土體由于地形或人工開挖造成嵌固段出現(xiàn)臨坡或傾斜地形時(shí),抗滑樁的穩(wěn)定性會(huì)受到相應(yīng)的影響。對(duì)于嵌固段臨坡的地形,當(dāng)抗滑樁嵌固段的臨坡距過小,達(dá)不到半無限空間狀態(tài)時(shí),抗滑樁的側(cè)向承載能力就會(huì)相應(yīng)降低。對(duì)于嵌固段傾斜的地形,抗滑樁的穩(wěn)定性會(huì)直接受到斜坡地形的影響。目前對(duì)于嵌固段臨坡或傾斜條件下抗滑樁樁前土體穩(wěn)定性的研究也不足。因此有必要對(duì)嵌固段臨坡條件下的最小臨坡距與傾斜條件下的無效嵌固深度進(jìn)行研究,以便給實(shí)際工程中嵌固段臨坡或傾斜條件下的抗滑樁設(shè)計(jì)、施工及其穩(wěn)定性計(jì)算提供參考。本文提出了碎石土斜坡場(chǎng)地條件下的抗滑樁嵌固段最小臨坡距的取值方法,結(jié)合數(shù)值模擬和物理模擬研究了各因素對(duì)最小臨坡距的影響,提出了最小臨坡距計(jì)算公式。并結(jié)合最小臨坡距,提出了抗滑樁無效嵌固深度的計(jì)算公式。主要結(jié)論如下:(1)借鑒《建筑地基基礎(chǔ)設(shè)計(jì)規(guī)范理解與應(yīng)用》中邊坡地基最小臨坡距取值方法,提出了抗滑樁嵌固段的最小臨坡距取值方法。并根據(jù)最小臨坡距,提出了無效嵌固深度的計(jì)算方法。(2)用flac3d數(shù)值模擬定性、定量的研究了嵌固深度、坡度、滑坡推力、滑坡推力作用點(diǎn)對(duì)最小臨坡距的影響,發(fā)現(xiàn)最小臨坡距隨滑坡推力、坡度的增加而增加,隨嵌固深度的增加而減少,與滑坡推力作用點(diǎn)的關(guān)系不大。并驗(yàn)證了數(shù)值模擬中最小臨坡距取值方法的適用性。(3)用物理模擬的實(shí)驗(yàn)方法定性、定量的分析了嵌固深度、坡度、推力對(duì)最小臨坡距的影響,發(fā)現(xiàn)各因素對(duì)最小臨坡距的影響與數(shù)值模擬中的一致。并驗(yàn)證了物理模擬中最小臨坡距取值方法的適用性。(4)結(jié)合正交實(shí)驗(yàn)方法擬合出了最小臨坡距和無效嵌固深度的計(jì)算公式。
[Abstract]:In the existing anti-slide pile design, the anti-slide pile is generally set in the smooth section of the slide surface, and the fixed segment is regarded as a semi-infinite space, and the design and stability calculation of the embedded depth of the anti-slide pile are carried out. The stability of the anti-slide pile will be affected when the slope or slope is caused by the landform or artificial excavation. The lateral bearing capacity of the anti-slide pile will be reduced when the distance between the adjacent slopes of the embedded section is too small to reach the semi-infinite space state for the landform near the slope of the embed section and the lateral bearing capacity of the anti-slide pile will be reduced accordingly. The stability of anti-slide pile is directly affected by the slope terrain for the slope. At present, the study on the stability of soil in front of anti-slide pile under the condition of embed slope or slope is also insufficient. Therefore, it is necessary to study the minimum distance between the adjacent slope of the embedded section and the invalid depth of the embedded section in order to design the anti-slide pile under the condition of the embed section or the slope in the actual engineering. Construction and stability calculation provide reference. In this paper, the method of selecting the minimum critical slope distance of the fixed section of anti-slide pile in the condition of gravel soil slope site is put forward. The influence of various factors on the minimum critical slope distance is studied by combining numerical simulation and physical simulation, and the formula for calculating the minimum critical slope distance is put forward. The formula for calculating the invalid embedded depth of anti-slide pile is put forward based on the minimum critical slope distance. The main conclusions are as follows: (1) based on the method of determining the minimum critical distance of slope foundation in the Code for Design and Application of Building Foundation, a method for determining the minimum critical slope distance of the embedded section of anti-slide pile is put forward. According to the minimum critical slope distance, the calculation method of invalid embedded depth is put forward. (2) the influence of embedded depth, slope and landslide thrust on the minimum critical slope distance is quantitatively studied by flac3d numerical simulation. It is found that the minimum slope distance increases with the increase of the thrust of the landslide and decreases with the increase of the embedded depth, which has little relationship with the action point of the thrust of the landslide. The applicability of the minimum critical slope distance method in numerical simulation is verified. (3) the influence of the embedded depth, slope and thrust on the minimum critical slope distance is analyzed qualitatively and quantitatively by the physical simulation method. It is found that the influence of various factors on the minimum critical slope distance is consistent with that in the numerical simulation. The applicability of the minimum critical slope distance method in physical simulation is verified. (4) the formulas for calculating the minimum critical slope distance and the invalid embedded depth are fitted with the orthogonal experimental method.
【學(xué)位授予單位】：成都理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TU473.1;P642.22

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本文編號(hào)：2241585