盤截面形式對混凝土擴盤樁抗壓破壞狀態(tài)的影響研究
發(fā)布時間：2018-07-24 21:43
【摘要】：混凝土擴盤樁是一種新型樁,是在直孔樁的基礎(chǔ)上,在樁身的合適位置設(shè)置擴大盤來提高承載力,降低混凝土用量并能夠有效的縮短樁長,降低工程成本�；炷翑U盤樁有較強的抗壓、抗拔、抗傾覆能力,因此具有較高的實用價值,得到了廣泛的應(yīng)用。目前對于該樁的研究已經(jīng)取得了一定的成果,在理論研究上,主要從抗壓和抗拔兩種情況研究其計算模式及破壞狀態(tài)等。在試驗方面,有室內(nèi)原狀土小比例半面樁試驗法和現(xiàn)場大比例半截面混凝土擴盤樁灌注樁實樁抗壓試驗。在以上的所有研究中涉及的參數(shù)主要包括擴大盤間距、擴大盤高度、盤坡角等,但是在目前的施工機具中有很大一部分機具形成的擴大盤上表面是曲線型的且上下是不對稱的一種擴大盤,同時形成的是圓弧型盤端擴大盤并不是理論研究的尖角型盤端擴大盤,關(guān)于這種盤截面形式對于混凝土擴盤樁抗壓破壞狀態(tài)的影響需要進一步的研究探討。本文研究的是曲線型上表面擴大盤和直線型上表面擴大盤以及擴大盤的上下對稱性和盤端的形狀對于混凝土擴盤樁抗壓破壞狀態(tài)的影響,驗證混凝土擴盤樁抗壓承載力公式的是否也適用于以上盤型的混凝土擴盤樁。為了更好地設(shè)計盤型并考慮到與實際施工機具接軌,本文選取實際施工中廣泛應(yīng)用的一種樁徑及盤截面形式作為設(shè)計依據(jù),保證了理論和實際的一致性。利用有限元軟件ANSYS建立1:1的混凝土擴盤樁半面樁模擬,分析應(yīng)力、位移、破壞狀態(tài)的影響,并將ANSYS軟件中的模擬樁尺寸按照1:40的比例縮小,制作成半面模型樁,進行室內(nèi)原狀土小比例半面樁試驗,分析應(yīng)力、位移、土體破壞狀態(tài)的影響。通過分析ANSYS模擬結(jié)果和室內(nèi)原狀土小比例半面樁試驗結(jié)果發(fā)現(xiàn),尖角盤端混凝土擴盤樁和圓弧盤端的混凝土擴盤樁的抗壓破壞狀態(tài)基本一樣,通過對比發(fā)現(xiàn)上表面是直線型的擴大盤和上表面是曲線型的擴大盤對于混凝土擴盤樁的抗壓破壞狀態(tài)沒有影響,擴大盤上下是否對稱對于混凝土擴盤樁的抗壓破壞狀態(tài)也沒有影響,也同樣說明了現(xiàn)有混凝土擴盤樁抗壓承載力計算公式可以用于計算上表面是曲線的擴大盤和盤端圓弧形的混凝土擴盤樁的抗壓承載力,為了驗證結(jié)論和模型試驗的準確性,將模擬和模型樁試驗進行了對比分析,發(fā)現(xiàn)二者結(jié)論基本一致,說明了本文結(jié)論的準確性。通過本文的研究豐富了混凝土擴盤樁的理論,為該樁的實際應(yīng)用起到了必要的補充,對混凝土擴盤樁的推廣起到了一定的作用,同時本文也對室內(nèi)原狀土小比例半面樁試驗方法進行了相關(guān)的改進,為以后的研究提供了有力的借鑒。
[Abstract]:The concrete expanded disc pile is a new type of pile, which is based on the straight hole pile, and the expansion plate is set up in the proper position of the pile body to increase the bearing capacity, reduce the concrete content and effectively shorten the pile length and reduce the project cost. The concrete pile with expanded plate has strong ability of resisting compression, drawing and overturning, so it has high practical value and has been widely used. At present, some achievements have been made in the research of the pile. In the theoretical research, the calculation mode and the failure state of the pile are mainly studied from the two situations of anti-pressure and anti-drawing. In the aspect of test, there are laboratory test method of small proportion half-face pile with undisturbed soil and field test of large proportion semi-section concrete pile filled with concrete expanding disk pile. The parameters involved in all of the above studies mainly include enlarging disc spacing, enlarging disk height, slope angle, etc. However, in the present construction machinery, a large part of the enlarged disk formed by a large number of machines and tools is curved and asymmetrical up and down. At the same time, the circular arc end enlarged disk is not a sharp angle end enlarged disk studied in theory. The influence of this type of disc section on the compressive failure state of concrete pile needs further study and discussion. In this paper, the effects of the upper and lower symmetry and the shape of the end of the expanded disk on the compressive failure state of the concrete pile are studied. It is verified that the formula of the compressive capacity of concrete pile is also applicable to the concrete pile with the plate type above. In order to better design the plate shape and take into account the connection with the actual construction equipment, this paper selects a widely used form of pile diameter and disc section in actual construction as the design basis, which ensures the consistency between theory and practice. The finite element software ANSYS is used to establish the half plane pile simulation of 1:1 concrete expanded disc pile. The influence of stress, displacement and failure state is analyzed. The size of the simulation pile in ANSYS software is reduced according to 1:40, and the half plane model pile is made. The influence of stress, displacement and failure state of soil is analyzed by laboratory test of small proportion half plane pile of undisturbed soil. Through the analysis of the ANSYS simulation results and the test results of the small scale half-plane pile of the undisturbed soil, it is found that the compressive failure state of the concrete expanded disc pile at the tip of the pointed corner is basically the same as that of the concrete expansion pile at the end of the circular disc. By comparison, it is found that the expansion plate with linear surface and the expanded plate with curved surface have no effect on the compressive failure state of concrete pile. Whether the top and bottom of the enlarged plate is symmetrical has no effect on the compressive failure state of the concrete pile. It is also shown that the existing formulas for calculating the compressive capacity of concrete pile can be used to calculate the compressive capacity of the expanded plate with curve on the upper surface and the concrete pile with circular arc at the end of the disk, in order to verify the accuracy of the conclusion and the model test. The simulation and the model pile test are compared and analyzed, and it is found that the two conclusions are basically the same, which shows the accuracy of the conclusion in this paper. The research in this paper enriches the theory of concrete expanded pile, plays a necessary role in the practical application of the pile, and plays a certain role in the promotion of concrete expanded plate pile. At the same time, this paper also improves the test method of the small proportion half plane pile in the indoor undisturbed soil, which provides a powerful reference for the future research.
【學(xué)位授予單位】：吉林建筑大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TU473.1
本文編號：2142747
[Abstract]:The concrete expanded disc pile is a new type of pile, which is based on the straight hole pile, and the expansion plate is set up in the proper position of the pile body to increase the bearing capacity, reduce the concrete content and effectively shorten the pile length and reduce the project cost. The concrete pile with expanded plate has strong ability of resisting compression, drawing and overturning, so it has high practical value and has been widely used. At present, some achievements have been made in the research of the pile. In the theoretical research, the calculation mode and the failure state of the pile are mainly studied from the two situations of anti-pressure and anti-drawing. In the aspect of test, there are laboratory test method of small proportion half-face pile with undisturbed soil and field test of large proportion semi-section concrete pile filled with concrete expanding disk pile. The parameters involved in all of the above studies mainly include enlarging disc spacing, enlarging disk height, slope angle, etc. However, in the present construction machinery, a large part of the enlarged disk formed by a large number of machines and tools is curved and asymmetrical up and down. At the same time, the circular arc end enlarged disk is not a sharp angle end enlarged disk studied in theory. The influence of this type of disc section on the compressive failure state of concrete pile needs further study and discussion. In this paper, the effects of the upper and lower symmetry and the shape of the end of the expanded disk on the compressive failure state of the concrete pile are studied. It is verified that the formula of the compressive capacity of concrete pile is also applicable to the concrete pile with the plate type above. In order to better design the plate shape and take into account the connection with the actual construction equipment, this paper selects a widely used form of pile diameter and disc section in actual construction as the design basis, which ensures the consistency between theory and practice. The finite element software ANSYS is used to establish the half plane pile simulation of 1:1 concrete expanded disc pile. The influence of stress, displacement and failure state is analyzed. The size of the simulation pile in ANSYS software is reduced according to 1:40, and the half plane model pile is made. The influence of stress, displacement and failure state of soil is analyzed by laboratory test of small proportion half plane pile of undisturbed soil. Through the analysis of the ANSYS simulation results and the test results of the small scale half-plane pile of the undisturbed soil, it is found that the compressive failure state of the concrete expanded disc pile at the tip of the pointed corner is basically the same as that of the concrete expansion pile at the end of the circular disc. By comparison, it is found that the expansion plate with linear surface and the expanded plate with curved surface have no effect on the compressive failure state of concrete pile. Whether the top and bottom of the enlarged plate is symmetrical has no effect on the compressive failure state of the concrete pile. It is also shown that the existing formulas for calculating the compressive capacity of concrete pile can be used to calculate the compressive capacity of the expanded plate with curve on the upper surface and the concrete pile with circular arc at the end of the disk, in order to verify the accuracy of the conclusion and the model test. The simulation and the model pile test are compared and analyzed, and it is found that the two conclusions are basically the same, which shows the accuracy of the conclusion in this paper. The research in this paper enriches the theory of concrete expanded pile, plays a necessary role in the practical application of the pile, and plays a certain role in the promotion of concrete expanded plate pile. At the same time, this paper also improves the test method of the small proportion half plane pile in the indoor undisturbed soil, which provides a powerful reference for the future research.
【學(xué)位授予單位】：吉林建筑大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TU473.1
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