【摘要】：為了分析不同孔隙水壓條件對砂巖應力-應變關系的影響,采用MTS812.03巖石試驗機對飽和砂巖進行不同圍壓、孔隙水壓常規(guī)三軸壓縮試驗,結合能量原理推導出適用于水巖耦合下砂巖破壞準則,并運用于數(shù)值模擬中進行分析驗證。結果表明:由于巖石加載過程自身就是一個能量積聚與釋放的過程,通過能量原理推導破壞準則,能更好地反映巖石破壞的真實情況,并通過引入孔隙水壓影響系數(shù),來彌補軟件不能模擬由于水壓造成的裂隙擴展過程的缺陷,最終通過對比分析得出,能量破壞準則的計算值與實際值相差小于5%,而Drucker-Prager與Hoek-Brown準則誤差值最大達到了35.34%和37.11%。因此,利用FLAC3D軟件通過基于能量原理推導出在水巖耦合作用下巖石的破壞準則是正確和合理的。
[Abstract]:In order to analyze the influence of different pore water pressure conditions on the stress-strain relationship of sandstone, a conventional triaxial compression test of saturated sandstone with different confining pressure and pore water pressure was carried out by MTS812.03 rock testing machine. Based on the energy principle, the failure criterion of sandstone is derived and applied to numerical simulation. The results show that because the loading process of rock itself is a process of energy accumulation and release, the failure criterion derived from the principle of energy can better reflect the true situation of rock failure, and the influence coefficient of pore water pressure is introduced. In order to make up for the defects of the software which can not simulate the process of crack expansion caused by water pressure, it is concluded by comparison and analysis that the difference between the calculated value of energy failure criterion and the actual value is less than 5, while the maximum error between Drucker-Prager and Hoek-Brown criterion reaches 35.34% and 37.11% respectively. Therefore, it is correct and reasonable to deduce the rock failure criterion under the coupling of water and rock by using FLAC3D software based on the energy principle.
【作者單位】： 遼寧工程技術大學土木工程學院;鞍鋼集團礦業(yè)設計研究院有限公司;
【基金】：國家自然科學基金資助項目(51274109)
【分類號】：TD315

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