海上风电吸力式沉箱基础沉贯试验研究  

TESTS ON INSTALLATION OF SUCTION OF OFFSHORE WIND TURBINE

作　　者：张鸿[1] 金书成[1] 黎冰[2] 龚维明[2] 邱月[3] 

机构地区：[1]中交第二航务工程局有限公司技术中心,武汉430040 [2]东南大学土木工程学院,南京210096 [3]河海大学岩土工程研究所,南京210098

出　　处：《太阳能学报》2016年第11期2827-2834,共8页Acta Energiae Solaris Sinica

基　　金：国家自然科学基金(50909020;51578145);江苏省普通高校研究生科研创新计划(CXZZ13_0242)

摘　　要：考虑不同的沉箱长径比和负压,通过一系列模型试验研究沉箱在砂土地基中的负压下沉行为,重点分析负压在地基土中的传递扩散问题,并利用试验数据定量分析水力梯度与土塞之间的关联问题。试验结果表明,负压作用下地基中产生自下而上的渗流,且发生流土现象,这是沉箱在负压下沉过程中产生土塞的重要原因之一。土塞高度与沉箱壁厚及贯入深度成正比,而与负压大小无关。施加的负压越大,地基土中的水力梯度越大,沉箱下沉速度越快。负压在沉箱内部衰减较慢,但在沉箱端部以下区域,负压衰减较快。Installation under negative pressure is one of the important features of suction caisson foundation. A series of model tests are carried out to investigate the behavior of caisson installed in medium sand under negative pressure. This paper is focused on the transfer and diffusion of negative pressure in ground, and the association between the hydraulic gradient and the soil heave. Four different length to diameter and four different negative pressure are considered in the model tests. The test results show that the seepage from down to up and the quick sand were occurred under negative pressure in all tests, which are the most important reasons for soil heave. The height of soil heave is proportional to wall thickness of caisson and embedded depth, regardless of magnitude of negative pressure. The larger the negative pressure, the larger the hydraulic gradient in ground and the faster the caisson sinking. The attenuation of negative pressure is slow in the caisson internal, however, the negative pressure attenuate soon in the following area of caisson tip.

关 键 词：吸力式沉箱 模型试验 砂土 沉贯 海上风力发电 

分 类 号：TK81[动力工程及工程热物理—流体机械及工程]