论文部分内容阅读
为了解桩承地基的工作机理,对深圳机场停机坪大面积桩承地基处理区域的桩顶沉降、桩间土沉降以及孔隙水压力进行现场测试,并对测试结果进行详细的分析和比较。结果表明:桩承地基能够有效地减小地基总沉降和桩土沉降差,桩土沉降差在19～25 mm;路堤填土中存在明显的土拱效应,土拱高度集中在0.83～1.04倍桩净间距,平均为0.94的桩净间距;桩土沉降差与土拱效应发挥程度密切相关,桩土沉降差是产生土拱效应的前提条件。
In order to understand the working mechanism of pile foundation, field tests were carried out on pile top settlement, settlement of soil between piles and pore water pressure in a large area of Shenzhen airport apron foundation treatment area. The test results were analyzed and compared in detail. The results show that the pile foundation can effectively reduce the total subsidence and pile-soil subsidence, the difference of pile-soil settlement is 19-25 mm. There is obvious soil arching in embankment filling, and the soil arching height is 0.83-1.04 The net spacing of the pile and the net spacing of the pile averaged 0.94. The difference between the pile-soil settlement and the effect of soil arching is closely related to the pile-soil settlement difference, which is the prerequisite for the soil arching effect.