构皮滩水电站工程软岩原位流变试验研究

In-situ rheological test and study of soft rock at Goupitan Hydropower Station

对构皮滩水电站第二级升船机基础的薄层状页岩进行了现场原位流变试验研究。结果表明,薄层状页岩在外荷载的长期作用下蠕变变形较大,表现出显著的黏弹性特征;同时根据半无限空间弹性理论,推导了基于刚性承压板原位流变试验的流变本构关系——Burgers模型解析表达式,并建立了岩体流变本构模型参数的辨识方法。研究结论有效解决了基于原位流变试验的岩体流变力学参数取值问题。

An in- situ rheological test of thin- layer shale was carried out for the second- level shiplift foundation at Goupitan Hydropower Station. The research shows that the thin shale has a large amount of creep deformation under the long- term external load,which is of prominent visco- elastic characteristic. According to the elasticity theory of semi- infinite space,the analytical expression of rheological constitutive relation,Burgers model,is derived based on rigid bearing plate in- situ rheological test.And the identification way for rock rheological constitutive model parameter is built. Therefore,the solution to the rheological parameters determination of rock mass based on in- situ rheological test is settled.