Mechanical Behavior of Kimachi Sandstone under Ultralow Temperature
Mechanical Behavior of Kimachi Sandstone under Ultralow Temperature
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超低温下 Kimachi 砂岩的力学行为
DOI：
10.2473/journalofmmij.127.8
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发表时间：
2010
期刊：
影响因子：
--
通讯作者：
M. Furuzumi
中科院分区：
文献类型：
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作者：
N. Kamoshida;M. Okawara;Masayoshi Abe;M. Furuzumi
溶洞储存液化燃料（如天然气、液态氢或二甲醚）的实际应用需要对溶洞进行热应力稳定性分析，了解岩体的热物理性质和力学性质是进行此类分析的必要条件。本研究首先以孔隙度为24.0%的Kimachi砂岩为研究对象，进行了-170℃下的线性膨胀应变测量试验，研究孔隙水冻结与膨胀应变的关系。通过对湿砂岩在冰点以下冷却至超低温条件下的单轴压缩试验和间接拉伸试验，考察孔隙冰的形成对湿砂岩强度的影响。研究结果如下：当Kimachi砂岩冷却时，会发生两次霜胀，因此线性膨胀系数在0到-70°C的温度范围内波动。这可能是因为木町砂岩中存在两种不同大小的孔隙，孔隙水的冻结温度随孔隙大小的不同而不同。湿砂岩的抗压强度和间接抗拉强度随试样温度的降低而增大。造成这种现象的原因有两个。一种解释是，在温度降至-50°C时，孔隙水几乎完全冻结，分担荷载的孔隙冰的增加是造成这种现象的主要原因。另一种解释是，在低于-50℃的温度下，由造岩矿物和孔隙冰的体积收缩引起的强度增加是主要原因。
The practical application of the rock cavern storage of liquefied fuels (such as natural gas, liquid hydrogen or dimethyl ether) requires stability analysis of the cavern in question with regard to thermal stress, and an understanding of thermophysical properties and mechanical properties of rock mass is essential for such analysis.In our research, a linear expansion strain measurement test up to —170°C was first conducted using Kimachi sandstone (24.0% porosity) to study the relationship between the freezing of pore water and its expansion strain. Then a uniaxial compression test and indirect tensile test were conducted with wet sandstone cooled down below freezing point to ultralow temperatures to review the influence of the formation of pore ice on the strength of wet sandstone. The following findings were obtained.When Kimachi sandstone is cooled down, frost swelling occurs twice, and therefore the linear expansion coefficient fluctuates over range of temperatures between 0 to —70°C. This may be because pores of two different sizes exist in Kimachi sandstone and the freezing temperature of the pore water differs depending on the pore size. The compressive strength and indirect tensile strength of the wet sandstone increase with the decrease in the specimen temperature. Two causes of this phenomenon may be identified. One is that an increase in pore ice that shares the load is the main cause of the phenomenon in temperatures down to —50°C where freezing of the pore water is almost completed. The other is that an increase in strength by volumetric shrinkage of the rock forming minerals and pore ice is the main cause in temperatures below —50°C.
零下温度循环下湿砂岩样品表面的热应变和冷冻应变
DOI：
--
发表时间：
2004
期刊：
Journal of Thermal Stresses 27
影响因子：
--
作者：
M.Furuzumi;Y.Takeshita;M.Kurashige;F.Nishimura;K.Hirose;K.Imai
通讯作者：
K.Imai