摘要
随着我国经济的发展和建筑设计的多样化，高层建筑的基础设计对保证工程安全和控制工程造价至关重要。在选择基础形式时与建筑物的使用性质、上部结构类型、地质情况、抗震性能、对周围建筑物的影响及施工条件等有密切的关系。为节约投资应该对地基基础多方案比较进行优化设计。
本设计的题目是焦作三维国贸中心4#住宅楼桩基础设计，主要思路是根据地质勘察资料、施工条件和工程要求，确定桩基础的桩型、桩的断面尺寸和长度、单桩容许承载力、桩的数量和平面布置以及承台的尺寸和构造，再根据承受的荷载验算桩基承载力，估算沉降量并验算桩和桩承台的强度。
通过设计桩基础要达到掌握桩基设计计算的具体原理及主要设计步骤，更深入地理解桩基工程特性。通过本次钻孔灌注桩基础设计，使作者对桩的受力特点、制作工艺、设计过程和施工方法有一个更为深入的了解，做到了把作者大学四年所学的力学知识和基础课程与具体工程紧密结合，真正实现了理论应用于实践，增强了动手能力，对今后解决实际问题大有帮助。
关键词：地基；桩基础；钻孔灌注桩；设计；
ABSTRACT
with the development of our economy and the diversification of architecturaldesign, foundation design of high-rise building is very important to guaranteeonstruction safety and control the project cost. In choosing base form buildings withhe use of the properties, the upper structure type, geological conditions, seismicperformance and influence on surrounding buildings and the construction conditionshave a close relationship. To save investment should optimize the foundation schemes designed.
the main idea of this design is according to the geological exploration data, construction conditions and engineering requirements, determine the pile foundation pile type, pile section size and length, the number of allowable bearing capacity of single pile, pile and plane arrangement and the size and structure of the cofferdam, again according to withstand the load calculation of pile foundation bearing capacity, estimating and calculating the pile settlement and the strength of the pile caps. Through the design to achieve mastery of pile foundation design and calculation of concrete pile foundation principle and main design steps, a deeper understanding of pile foundation engineering characteristics.
Through the drill hole filling pile foundation design, the author of pile bearing characteristics, production technology, design process and construction method has a more in-depth understanding, did the author at the university four years learning knowledge of mechanics and basic course and combining concrete engineering, truly achieve the theories into practice, enhance the ability to solve practical problems inthe future.
Key words:the foundation; Pile foundation;Bored piles; Design; The construction
目录
第一章绪论 (1)
第二章工程资料 (5)
2.1工程概况 (5)
2.2工程勘察情况 (5)
2.2.1 勘察目的与任务 (5)
2.2.2岩土工程勘察等级确定 (6)
2.2.3勘察工程布置 (6)
2.2.4勘探测试及取土方法简述 (6)
2.2.5勘察工作完成情况 (7)
2.3场地工程地质条件 (8)
2.3.1地形、地貌及地质构造条件 (8)
2.3.2水文地质条件 (8)
2.3.3场地土冻结深度 (8)
2.3.4不良地质作用 (8)
2.3.5地下水腐蚀性评价 (8)
2.3.6 活动断裂影响 (9)
2.4现场岩土工程分析与评价 (9)
2.4.1岩土参数的分析与选用 (9)
2.4.2各层土承载力特征值及压缩性评价 (10)
2.4.3各土层桩基参数 (13)
第三章单桩承台设计 (14)
3.1设计荷载 (14)
3.2桩径与桩长的选择 (14)
3.3单桩承载力计算 (14)
3.3.1单桩竖向极限承载力标准值 (14)
3.3.2基桩竖向承载力特征值 (15)
3.4桩基竖向承载力的验算 (15)
