【摘要】：嵌固深度是決定水平受荷樁穩(wěn)定性及承載能力的關(guān)鍵因素之一。因此,在對(duì)水平受荷樁進(jìn)行設(shè)計(jì)時(shí),確定合理的嵌固深度尤為重要。論文采用單樁水平靜載荷室內(nèi)模型試驗(yàn)和數(shù)值模擬計(jì)算等手段,以西南地區(qū)某輸電工程輸電桿塔的嵌巖灌注樁基礎(chǔ)為原型。通過(guò)改變嵌固段巖體的層面傾角、樁基嵌固深度、樁徑、樁身強(qiáng)度等因素,分析嵌巖樁的樁頂位移、樁身彎矩、樁側(cè)土壓力、樁側(cè)土體變形等變化規(guī)律,進(jìn)而對(duì)各因素影響下的層狀巖體水平受荷樁的承載性能、嵌固效果進(jìn)行研究,并獲得各層面傾角下的樁基最大嵌固深度,對(duì)指導(dǎo)嵌巖樁設(shè)計(jì)具有一定的意義。論文得到以下主要結(jié)論:(1)當(dāng)嵌固段巖體存在層面時(shí),水平受荷樁的承載性能明顯降低,并且隨著層面傾角的改變,樁基承載性能的變化也存在一定的規(guī)律:完整基巖場(chǎng)地層面傾角0°場(chǎng)地層面傾角30°場(chǎng)地層面傾角-30°場(chǎng)地。(2)當(dāng)嵌固段巖體的層面傾角不同,其嵌固效果也將發(fā)生改變,由好到壞依次為,完整基巖場(chǎng)地層面傾角0°場(chǎng)地層面傾角90°場(chǎng)地層面傾角30°場(chǎng)地層面傾角-30°場(chǎng)地層面傾角-60°場(chǎng)地層面傾角60°場(chǎng)地;(3)通過(guò)增大嵌固深度、樁身直徑,可以改善嵌巖樁的嵌固效果。而增加樁身強(qiáng)度對(duì)樁基的嵌固效果的改善無(wú)明顯作用;(4)通過(guò)對(duì)比不同嵌固深度的嵌巖樁水平承載力特征值變化規(guī)律,確定完整基巖、基巖層面傾角為0°、30°、-30°、60°、-60°、90°場(chǎng)地所對(duì)應(yīng)的最大嵌固深度,為嵌巖樁設(shè)計(jì)進(jìn)行指導(dǎo)。
[Abstract]:Embedded depth is one of the key factors to determine the stability and bearing capacity of horizontally loaded piles. Therefore, it is very important to determine the reasonable embedded depth in the design of horizontal pile. By means of single pile horizontal static load indoor model test and numerical simulation, this paper takes the rock-socketed cast-in-situ pile foundation of transmission tower in a transmission project in southwest China as the prototype. By changing the dipping angle of rock mass, the depth of pile foundation, the diameter of pile, the strength of pile and so on, the change rule of pile top displacement, pile bending moment, soil pressure on pile side and deformation of soil on pile side is analyzed, and the variation rules of pile top displacement, pile bending moment, pile side earth pressure and soil deformation are analyzed. Furthermore, the bearing capacity and embedding effect of horizontally loaded piles in layered rock mass affected by various factors are studied, and the maximum embedded depth of pile foundation under various dip angles is obtained, which has certain significance for guiding the design of rock-socketed piles. The main conclusions of this paper are as follows: (1) when there is a layer in the rock mass, the bearing capacity of the horizontal loaded pile decreases obviously, and with the change of the dip angle of the plane, the bearing capacity of the horizontal loading pile decreases obviously. The change of bearing capacity of pile foundation also has certain regularity: the plane inclination of complete bedrock site is 0 擄, the dip angle of site plane is 30 擄- 30 擄site. (2) when the dipping angle of rock mass is different, the embedding effect will also change. From good to bad, the inclination of site plane is 0 擄, the inclination of site plane is 90 擄, the angle of site plane is 30 擄, the dip angle of site plane is 60 擄, the inclination angle of site plane is 60 擄. (3) the embedding effect of rock-socketed pile can be improved by increasing the embedded depth and the diameter of pile. However, increasing the strength of pile has no obvious effect on the improvement of the embedding effect of pile foundation. (4) by comparing the variation law of the horizontal bearing capacity of rock-socketed piles with different embedded depth, the maximum embedding depth corresponding to 0 擄, 30 擄,-30 擄, 60 擄,-60 擄, 90 擄sites of complete bedrock is determined, and the slope angle of bedrock layer is 0 擄, 30 擄,-30 擄,-60 擄,-60 擄and 90 擄, respectively. To guide the design of rock-socketed piles.
【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(lèi)號(hào)】：TU473.1

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本文編號(hào)：2445848