摘要
构皮滩水电站第二级升船机修建于具有显著蠕变特性的页岩之上,为确保其长期稳定性及安全性,对页岩的蠕变特性及地基的长期变形开展一系列研究。首先,根据现场刚性承压板压缩蠕变试验的结果,对蠕变模型及其参数进行辨识;随后,通过模型桩载荷试验,得到桩–岩接触面受力变形特性及其极限摩阻力;最后,借助数值分析软件对采用不同结构形式的升船机基础长期沉降变形进行对比分析,并优选桩筏基础作为推荐的基础方案。研究结果不仅对升船机基础选型具有一定的参考价值,而且还可为其长期稳定性评估以及合理预留地基变形余量提供依据。
The second level ship-lift of Goupitan hydropower station is built upon the shale mass which has significant creep properties. In order to ensure the long-term stability and safety,a series of study have been carried out to investigate the creep characteristic of the shale and the long-term deformation of ship-lift foundation. Firstly,the creep model and its parameters are identified according to the results of in-situ rigid bearing plate creep test;Secondly,based on the analysis of model pile loading test results,the stress and deformation characteristics of the pile-rock interface and its ultimate friction resistance can be investigated respectively. Finally,with the help of numerical simulation,the long term settlement of ship-lift based on different types of foundation structure are analyzed and compared,and the pile-raft foundation is optimized as the recommended foundation scheme. The above results not only has a certain reference value for the selection of ship lift base,but also provides evidence for evaluating its long term stability and reserving the reasonable foundation deformation allowance.
出处
《岩石力学与工程学报》
EI
CAS
CSCD
北大核心
2016年第A02期4094-4102,共9页
Chinese Journal of Rock Mechanics and Engineering
基金
同济大学教育部岩土及地下工程重点实验室开放实验基金资助项目(KLE–TJGE–B1108)~~
关键词
岩石力学
蠕变模型
参数反演
地基处理
变形预测
rock mechanics
creep model
parametric inversion
foundation treatment
deformation prediction
