車籠埔斷層周圍岩石力學特性之初探
Date Issued
2005
Date
2005
Author(s)
陳正旺
DOI
zh-TW
Abstract
Generally, in order to study the mechanical characteristic of the strata, we often measure the physical and mechanical properties of the specimens took from the surface of the earth. In the real case, the rocks’ characteristic changed by the depth and the properties. If we took the rocks to a single property, it can not describe the strength and deformation of the strata completely.
In this study, we research the mechanical characteristic of the specimens of two source. One is the Cholan sandstone which was took from Cao-ling, the other is the cores with a depth ranging from 450 to 1300m from TCDP program. Accordingly, the specimens are subjected to a series of mechanical experiments, including stress-path controlled pure shear tests to study their physical properties as well as their strengths and deformability with elastic and plastic strained being distinguished. Meanwhile, temperature factor are also conducted so as to study the influence on the rocks.
According to the experimental results, we can found that the Drucker- Prager failure criteria can describe the failure envelop line of rocks applicably, and the stress-path and strength of rocks are not related. It was also found that the rocks with lower porosities exhibit larger deformation than rocks with higher porosities. According to the notion of distinguishing the deformation from elastic and plastic components, it can describe the behavior of rocks subjected to volumetric stress and shear stress applicably, including the non-linear elastic deformation ,plastic strain locking, the elastic volumetric strain was coupled with shear stress.
As to the temperature factor, the influence of the factor on rocks was not very apparent in this research. Finally, according to the constitutive model of sandstone, we can obtain the parameters of the elastic and plastic model, then we can predict the stress-strain curve of rocks and compare with the data from pure shear triaxial test. According to the analysis, we can find that the constitutive model can applicably describe the deformable characteristic of rocks of type I and type Ⅲ.
Subjects
車籠埔斷層
純剪應力路徑
加溫實驗
Chelungpu-fault
pure shear stress path test
temperature
Type
thesis