【正文】 聚合物、 砂井預壓和塑料排水帶；從如何進行深層密實處理的方法考慮，采用加大擊實功的措施，發(fā)展了“強夯法”和振動的“水沖法”等。 改善特殊土的不良地質特性。地基的動 力特性表現(xiàn)在地震時飽和松散粉細砂（包括部分粉土）將產生液化 [7]；由于交通荷載或打樁等原因，使鄰近地基產生振動下沉。以上都是在地下水的運動中所出現(xiàn)的問題，為此，必須采取措施使地基土降低透水性或減少其水壓力。 改善地基的透水特性。地基的壓縮性反映在地基土的壓縮模量指標的大小。 降低地基的壓縮性。地基的剪切破壞表現(xiàn)在：建筑物的地基承載力不夠； 2 由于偏心荷載及側向上壓力的作用使結構物失穩(wěn)；由于填土或建筑物荷載，使鄰近地基產生隆起；土方開挖時邊坡失穩(wěn)；基坑開挖時坑底隆起。所以我們要重視地基處理。上海展覽中心館、墨西哥市藝術宮等建筑地基的嚴重下沉 :天津市人民會堂辦公樓、匈牙利一碼頭建筑物的墻體開裂 。地基處理的不當，會造成很大的損失。 地基與建筑物的關系極為密切。 建筑物的地基所面臨的問題有以下四方面：（ 1）承載力及穩(wěn)定性問題；（ 2）沉降、水平位移及不均勻沉降問題；（ 3）滲漏問題；（ 4）液化問題 [2]。凡是基礎直接建造在未經(jīng)加固的天然土層上時，這種地基稱之為天然地基 [1]?；A是指建筑物向地基傳遞荷載的 下部結構，它具有承上啟下的作用。因此，地基處理走在了工程設計的前列。根據(jù)設計原則，該類土受荷能力低 ,容易產生下沉、傾斜和破壞。s foundation the processing to the high pressure grouting note to starch of application and design made thorough study and research. According to project the actual situation on the ground treatment of several programs are analyzed and pared to determine use of highpressure rotary spray pile foundation In the devise, the article reasonably selects parameters such as diameter of pile, pile length, pile shaft strength, reduced coefficients of pile shaft, and calcutes Eigenvalue of bearing capacity of a pile bining with local facilities of construction, techniques of construction and devise experience. In the construction, the article mainly takes charge of selecting construction parameters, and puts up with important questions about engineering. According to this research, the key issues of the highpressure jet grouting pile posite foundation design and calculation is concluded to choose a reasonable result of design parameters. High Pressure Jet Pile technology Jiaozuo Coal Mine Railway Guhanshan coal bunker in the successful application of soft ground has not only improved the foundation of soft soil bearing capacity and shorten the construction period, and the construction process on adjoining buildings without adversely affected by the multipraised, what is more important is to solve problems similar projects, providing a successful model. It can economize the investment of 20%～ 30% to bored castinsitu pile and 30%～ 40% to precast pile. Keywords: HighPressure Rotary Jet Grouting Pile Foundation Treatment Applied Research III 目 錄 摘 要 .............................................................................................................. I ABSTRACT ......................................................................................................II 目 錄 ........................................................................................................... III 1 緒 論 ........................................................................................................ 1 研究背景 ................................................................................................ 1 地基處理技術的國內外發(fā)展概況 ......................................................... 2 地基處理存在的問題 ............................................................................. 6 本文研究的主要內容 ............................................................................. 7 2 地基處理相關理論 ................................................................................... 8 軟弱地基 ................................................................................................ 8 復合地基 ................................................................................................ 9 復合地基的定義和分類 .......................................................... 9 復合地基的形成條件 .........................................................................10 地基處理方法 .......................................................................................13 高壓旋噴注漿法 ...................................................................................19 高壓噴射注漿 法概述 .........................................................................20 高壓旋噴注漿法加固地基機理 .........................................................26 旋噴注漿復合地基的承載特性和工程特性 .........................................30 旋噴樁應力一應變特征 .....................................................................30 復合地基破壞特性及荷載分擔比 .....................................................30 IV 復合地基樁身應力分布及應力場 .....................................................31 旋噴注漿法的可靠性 .........................................................................31 3 高壓旋噴注漿法的工程應用 ...................................................................33 工程概況 ...............................................................................................33 地基處理方案 的確定 ............................................................................38 高壓旋噴樁設計 ...................................................................................40 復合地基承載力設計值 .....................................................................40 復合地基承載力計算 .........................................................................40 復合地基的變形計算 .........................................................................42 褥墊層設置 ...................................................................................... 42 高壓旋噴樁施工 ...................................................................................48 高壓旋噴樁復合地基質量檢驗 ............................................................52 結語 ..................................................................................................... 58 推廣應用實例 .......................................................................................58 4 結論與建議 ..............................................................................................60 課題結論 ...............................................................................................60 建議 .......................................................................................................61 1 1 緒 論 研究背景 我國 地貌廣闊，有各種成因的軟土層，如沿海地區(qū)濱海相沉積土、太行山洪積扇、江河中下游的三角洲相沉積