本文關鍵詞：抗拔樁極限承載力預測模型研究　出處：《南昌航空大學》2017年碩士論文　論文類型：學位論文

  更多相關文章： 抗拔樁 試驗 函數(shù)模型 極限承載力

【摘要】：隨著我國國民經(jīng)濟的快速發(fā)展,土木工程建設方興未艾,深基礎的應用范圍越來越廣泛,樁基礎在工程建設中發(fā)揮著十分重要的作用,其中的抗撥樁普遍應用于地下抗浮結構物、高聳而輕型的結構物、深基坑開挖以及膨脹土地區(qū)等。如何正確預測抗拔樁的承載能力,保證抗拔樁的安全使用。在此背景之下,本文主要進行以下幾個方面的工作:(1)對樁基礎的發(fā)展歷史進行闡述,總結抗拔樁的研究現(xiàn)狀,包括現(xiàn)場試驗研究、模型試驗研究和極限承載力計算等。(2)介紹抗拔樁基礎的理論研究。在相關參考文獻的基礎上分析抗拔樁的破壞形態(tài)、抗拔樁和承壓樁荷載傳遞機理的異同和抗拔樁承載力的計算方法。(3)根據(jù)樁基現(xiàn)有的技術規(guī)范,所計算的值往往偏于保守,造成資源的浪費和工程成本的提高。對此,本文在考慮了樁身自重的情況下,通過對折減系數(shù)進行調整以估算鉆孔灌注樁抗拔承載力。(4)在靜載荷有限的實驗數(shù)據(jù)的背景下,利用灰色模型新陳代謝法取四組不同的數(shù)據(jù)對殘差值進行預測,確定了殘差值最小,精確度最高的數(shù)據(jù)組,優(yōu)化了灰色預測過程中對原數(shù)據(jù)的選取。(5)根據(jù)三根樁S/Q-S的直線擬合圖可以清楚的看出每段的直線斜率在不斷減小,即預測的數(shù)據(jù)點越多預測的抗拔樁破壞荷載也越大。(6)根據(jù)折減系數(shù)法得到三根樁的極限承載力對比工程中靜載荷法得到的極限承載力,可以得出由于靜載荷試驗設備有限,工程中對承載力估計偏于保守。
[Abstract]:With the rapid development of our national economy, just unfolding civil engineering construction, deep foundation is applied more and more widely, pile foundation plays a very important role in the engineering construction, the anti pulling pile is widely used in underground anti floating structures, lightweight structures towering, deep excavation and expansive soil area. How to correctly predict the bearing capacity of uplift piles, ensuring the safe use of the uplift pile. Under this background, this thesis mainly focuses on the following work: (1) the development history of the pile foundation are expounded, summarizing the research status of uplift piles, including field tests, bearing capacity calculation model experimental study and limit. (2) the theoretical study on uplift pile foundation. The failure pattern of pile based on related references, similarities and differences between the transfer mechanism of pile and pile bearing load resistance and bearing capacity of uplift piles The calculation method. (3) according to the technical specification of existing pile foundation, tends to be conservative values calculated, resulting in a waste of resources and increases the cost of project. In this regard, considering the pile gravity, adjusted to estimate the uplift bearing capacity of Drilled Grouting Pile by fold reduction coefficient (4. The experimental data of static load) in the limited context of the four different groups of data on the residual value is predicted by the grey model method to determine the residual value of The new supersedes the old., minimum data set the highest accuracy, optimize the selection of the original data of grey prediction process. (5) according to the linear fitting chart of three piles S/Q-S can each section of straight slope decreases constantly see clearly, the more predicted data point prediction of uplift pile failure load is greater. (6) according to the reduction coefficient of three pile ultimate bearing capacity in the static load is obtained by the method of comparison of Engineering The ultimate bearing capacity can be obtained because the static load test equipment is limited, and the estimation of the bearing capacity is conservative in the project.

【學位授予單位】：南昌航空大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TU473.1

【參考文獻】

相關期刊論文 前10條

1 錢建固;馬霄;李偉偉;黃茂松;王衛(wèi)東;;樁側注漿抗拔樁離心模型試驗與原位測試分析[J];巖土力學;2014年05期

2 劉念武;張忠苗;俞峰;房凱;;黏性土中微型樁抗壓和抗拔現(xiàn)場試驗[J];天津大學學報;2013年08期

3 胡琦;凌道盛;孔令剛;羅耀武;牛r，

本文編號：1399955