某办公楼桩基础设计(对).docVIP

摘要 该项目是高层建筑的地基处理工程，经过勘察得出，为满足地基处理稳定性要求，采用桩基础。在桩基础的设计过程中，要先确定桩的规格和单桩竖向承载力，根据单桩竖向承载力大概确定桩的数量和平面布置，把这些得到的数据再进行验算，看是否能满足符合实际情况下的承载力要求。这是一个反复进行的过程，直到结果满足为止。光满足承载力还是不够的，还要能保证建筑物建成使用后，桩基沉降不能超过某一限制，如果前面的设计不满足这个要求，还是要重新对桩基础进行设计。在此基础上，对桩的配筋还要进行计算，保证桩的承载力。 另外，在桩基础的设计基础上，又添加了施工图预算，使得甲方能够更好的掌握整个工程各项的情况。 关键字：高层建筑，桩基础，预算 An office building pile foundation design Abstract The project is the high-rise buildings foundation treatment works, through the investigation concludes the stability of ground treatment requirements to meet, with pile foundation. In pile foundation design process, should determine if the pile size and load capacity, vertical bearing capacity is probably under the pile to determine the number and layout, these data further by checking to see if realistic situations to meet the capacity requirement. This is a process repeated until the results meet the date. Light is not enough to meet the capacity, but also can ensure the building into use, the pile settlement not exceed a certain limit, if the design does not meet this requirement before, still have to re-design of the pile foundation. On this basis, the reinforcement of the pile should be calculated to ensure that the bearing capacity of piles. In addition, based on the design of pile foundation, then add the Construction Budget,making Party to better grasp the situation of the whole project. Keywords: high-rise building, pile foundation, the budget  目录 摘要 1 绪论 5 1 场地工程地质条件 5 1.1 工程概况 5 1.2 拟建场地工程地质条件 6 1.2.1 地形地貌 6 1.2.2 地层时代、成因及岩性特征 6 1.2.3 水文地质条件 8 1.2.4 不良地质作用及地质灾害 9 1.2.5 地震烈度 9 1.3 工程地质问题与评价 12 1.3.1 场地均匀性和适宜性评价 12 1.3.2 地基土湿陷性评价 12 1.3.3 岩土工程评价及推荐参数 12 1.3.4 场地地震效应 13 1.3.5 腐蚀性评价 14 2 单桩承载力的确定 15 2.1 单桩承载力估算 15 3 群桩承载力的确定 16 3.1 桩数及承台尺寸的确定 16 3.2 桩的布置 17 3.2.1 桩的最小中心距 17 3.2.2 桩的平面布置 17 3.2.3 承台尺寸设计 17 3.2.4 群桩承载力验算 19 3.2.5 桩顶作用效应验算 20 4 桩基沉降计算 22 4.1 规范要求 22 4.2 确定Ｚｎ 22 4.3 桩基沉降计算结果 23 5 桩基构造 24 5.1 混凝土强度选择 24 5.2 桩身配筋 25 6 承台构造设计 28 6.1 规范要求 28 6.2 承台设计 28 6