毕设基本摘要
摘 要
随着我国改革开放的深入，城市建设也随之迅猛展开，珠江三角洲地区则是这次经济热潮中的佼佼者。为了提高城市土地的利用率，该地区地质条件较差的软弱土地区也变成了城市建设用地。但是，软弱地基土承载力较低，含水量较高、压缩性较大、土层性质复杂多变，不能满足工程建设的要求，这就需要对其进行人工处理。
水泥土搅拌桩是加固软土地基的一种有效方法，它具有如下几大优点：可最大限度地利用地基土,并且施工时没有地基土的侧向挤出,对原有建筑物的影响较小,可在建筑物密集的地方进行施工;可根据地基土性质的不同,合理选择固化剂及其配合比,设计比较灵活;施工时无振动、噪音和污染;可灵活地采用柱状、壁状、格栅状和块状等形式加固地基;土体加固前后重度相差不大,基本不会由于水泥土桩的设置而对软弱下卧层产生附加应力(沉降);与其他方法相比,造价低廉,工期较短等。
因而该地基处理方法在公路、铁路、水利、市政以及建筑等工程建设中得到了迅速而广泛的应用。
关键词 ：软土地基，水泥土搅拌桩复合地基，复合地基承载力，沉降量，经济方便。
ABSTRACT
With the deepening of China's reform and opening up, the rapid urban construction also will start in the Pearl River Delta region is the economic boom of the leader. In order to improve the utilization of urban land, poor geological conditions in the region of the weakness has become a land area of urban construction sites. However, the weak foundation soil bearing capacity of low moisture content higher compression of the larger, complex and changing nature of soil and can not meet the requirements of construction projects, which need to be manual processing.
Cement mixing pile of soft soil reinforcement is an effective method, it has several major advantages are as follows: to maximize the use of soil, and no construction of soil out of the side, the impact of the original buildings more Small, in building construction-intensive areas; according to the different nature of soil, a reasonable choice than curing agents and their support, more flexible design, construction, no vibration, noise and pollution, to have the flexibility to use cylindrical, wall-like, And the massive grille-like form of strengthening the foundation; soil reinforcement little difference between before and after the severe, not because of the basic soil-cement pile and set on weak underlying stratum have additional stress (the settlement); Compared with other methods, low cost , Such as a shorter period.
Thus the foundation approach in highways, railways, water conservancy, municipal and construction works in the construction of the rapid and widespread application.
KEY WORDS: soft soil, soil-cement mixing pile composite foundation, the foundation of carrying capacity, settlement, economic convenience.
该住宅楼位于广州市，为楼高9层的商住楼。
拟建场区地貌上属冲击地带。据钻孔探查得，场地上覆盖土层自上而下分布为：杂填土、耕植土、冲积成因的淤泥（淤泥质土）、砂（细砂、中砂）、粉质粘土（粘土）、残积成因的含砾粉质粘土或粘土、基岩（二叠系灰岩）等。
由此可见，该场区在地质学上属于典型的冲积成因的软土地基。
根据该场区软土地基的特点，参考该地区同类型建筑的地基处理方法与经验，在该类型地基上兴建楼高不超过30m的多层民用住宅，采用深层水泥搅拌法对该软土地基进行处理，形成深层水泥搅拌桩复合地基。综合比较安全、造假、工期及工艺水平后，确定深层搅拌复合地基为地基方案。
深层搅拌桩复合地基充分利用原状土的承载力，从而造价较低，同时具有施工灵活、方便、工期较短可灵活掌握、无震动无噪声、对周围环境无污染等优点，是珠江三角洲地区应用较为广泛的地基处理方法之一。
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