本文選題：樁基礎 + 優(yōu)化設計��； 參考：《西安建筑科技大學》2014年碩士論文

【摘要】：隨著我國經(jīng)濟的快速發(fā)展,大量高層建筑拔地而起,這就對地基基礎設計提出了更高要求。由于樁基礎具有整體性好和剛度大的特點,能承受較大的豎向荷載和水平荷載,能適應高、大、重的建筑物對地基基礎的要求,因此樁基礎廣泛應用于高層建筑基礎工程中。本文針對西安市某高層住宅樓場地的工程地質(zhì)條件,分析比較了兩種樁基礎方案:預應力混凝土管樁和鉆孔灌注樁。首先,在樁基選型方面通過對這兩種樁基礎方案的優(yōu)缺點進行對比分析,主要從樁基礎的承載力特性、工程進度、工程質(zhì)量和對周邊環(huán)境影響等方面綜合比較后,建議采用預應力混凝土管樁作為該高層住宅樓的樁基礎。樁基礎的優(yōu)化分析對能否充分發(fā)揮樁基承載力、樁基是否安全可靠和能否降低施工成本尤為重要。本文利用FLAC3D數(shù)值分析軟件,建立了該高層建筑的樁土相互作用三維模型,對所選的預應力混凝土管樁基礎進行優(yōu)化分析。研究了豎向荷載作用下樁基的承載機理,得出了:①樁頂荷載和沉降的變化關系曲線(Q-S);②樁身軸力隨深度分布曲線(N-H)。通過對不同樁徑、不同樁長基樁承載特性的模擬分析,得出了最優(yōu)樁長、樁徑,繼而實現(xiàn)了節(jié)約投資,工程安全可靠的目的。最后,通過現(xiàn)場靜載試驗驗證了所選樁型的承載力滿足設計要求。
[Abstract]:With the rapid development of economy in our country, a large number of high-rise buildings have emerged from the ground, which puts forward higher requirements for foundation design. Because the pile foundation has the characteristics of good integrity and high stiffness, it can withstand large vertical load and horizontal load, and can meet the requirements of high, large and heavy buildings on the foundation, so the pile foundation is widely used in the foundation engineering of high-rise buildings. In view of the engineering geological conditions of a high-rise residential building in Xi'an, this paper analyzes and compares two kinds of pile foundation schemes: prestressed concrete pipe pile and bored cast-in-place pile. First of all, through the comparative analysis of the advantages and disadvantages of the two kinds of pile foundation schemes in the selection of pile foundation, mainly from the pile foundation bearing capacity characteristics, project schedule, project quality and impact on the surrounding environment, etc. It is suggested that the prestressed concrete pipe pile be used as the pile foundation of the high-rise residential building. The optimization analysis of pile foundation is particularly important for whether the bearing capacity of pile foundation can be brought into full play, whether the pile foundation is safe and reliable and whether the construction cost can be reduced. In this paper, a three-dimensional model of pile-soil interaction in this high-rise building is established by using FLAC3D software, and the selected prestressed concrete pipe pile foundation is optimized and analyzed. The bearing mechanism of pile foundation under vertical load is studied, and the curve of the relationship between the top load and settlement of pile No. 1 is obtained. By simulating and analyzing the bearing characteristics of pile with different pile diameters and different pile lengths, the optimum pile length and pile diameter are obtained, and the purpose of saving investment and engineering safety and reliability is realized. Finally, the bearing capacity of the selected pile type is verified by static load test.
【學位授予單位】：西安建筑科技大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：TU473.1

【參考文獻】

相關期刊論文 前2條

1 周玉明;郭陽旭;王曉建;孫懷軍;;靜力觸探確定沉管灌注樁單樁極限承載力方法[J];石家莊鐵道學院學報;2007年01期

2 張朔;葉棋鋒;;高層住宅樁型的選擇[J];住宅科技;2006年04期

，

本文編號：1909210