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1 前言 上海地区沉降控制复合桩基的桩端持力层都选在⑥层硬土层(E_s≥6MPa)之上的⑤层土中(E_s<6MPa),即使是12层小高层也有这类工程实例[《住宅科技》2000(4)]。其思路是想让建筑物有一定的沉降量,以便保证桩土共同作用的发挥。而上海以外地区的复合桩基设计,桩端持力层却多选在E_s≥6MPa的硬土层中,只不过这时的设计思想是基于地基土的强度,而未从沉降控制的角度来思考问题。笔者所接触的设计人员与房地产商,对于有意将桩端持
1 INTRODUCTION The pile-end bearing capacity of subsidence control composite pile foundations in Shanghai area are all selected in the ⑤ soil layer (E_s <6MPa) above the ⑥ layer hard soil layer (E_s ≧ 6MPa) Project example [“Residential Science and Technology” 2000 (4)]. The idea is to let the building have a certain amount of settlement in order to ensure the common play of pile soil. However, the design of composite pile foundation outside Shanghai is more than that of the pile with E_s≥6MPa. However, the design idea at this time is based on the strength of foundation soil and not from the perspective of settlement control Thinking about the problem. The author contacted by the designers and realtors, for the purpose of holding the pile end