【摘要】 为了研究西部白垩系砂岩强度特性对温度的敏感性,对现场取样得到的砂岩进行人工冻结,然后分别对白垩系中粒、粗粒砂岩进行了不同温度条件下的单轴、三轴压缩试验,根据得到的试验数据分析了温度对白垩系砂岩强度特性的影响。结果显示:西部白垩系人工冻结饱和砂岩的强度值均随着温度的降低而逐渐增大,颗粒大小及加压方式的不同,只是对强度的增长速率和增长幅度有明显影响;且在相同温度下进行比较,其粒径的大小也会对砂岩强度产生一定的影响,颗粒越粗强度越高,即粗粒强度大于中粒强度。试验结果及分析可为西部白垩系地层选用冻结法方案时提供一定的理论依据。更多还原

【Abstract】 In order to study the sensitivity of the strength characteristics of the western Cretaceous sandstone to temperature, the sand samples obtained from the on-site sampling were artificially frozen, and then the uniaxial and triaxial compression tests of the Cretaceous medium-grain and coarse-grained sandstones were carried out under different temperature conditions. The obtained experimental data was used to analyse the effect of temperature on the strength characteristics of Cretaceous sandstone. The results show that the intensity values of the artificially frozen saturated sandstones in the western Cretaceous increase with the decrease of temperature, and the difference in particle size and pressure mode only has a significant effect on the growth rate and growth rate of the strength; Under comparison, the size of the particle size will also have a certain effect on the strength of the sandstone. The coarser the grain, the higher the strength, that is, the coarse grain strength is greater than the medium grain strength. Through the analysis of the test results, it is expected to provide a theoretical basis for the selection of the freezing method for the western Cretaceous strata.更多还原