CAJ | 학술논문

为了研究含倾斜非盐夹层盐岩体的变形与破损特性,开展了含倾斜夹层盐岩试样的单轴、三轴压缩试验,并结合复合岩体破坏的理论分析,探讨了界面黏结应力的变化规律及其影响因素,揭示了倾斜层状盐岩体变形与破坏特征及其机制.研究表明,倾斜夹层对盐岩体的变形与破损具有显著影响.夹层各部破损形式与其所处位置有关;裂纹在界面处最先萌生、进而扩展到夹层和盐岩层;试验观察到盐斑的穿晶断裂现象并揭示了其力学机制;夹层厚度影响着盐岩体整体性能和破损特性,相对于薄夹层、中厚夹层更容易形成宏观裂纹;围压作用减少了夹层不同部位的破裂形态差异及界面黏结应力差异.该结果为含地层倾角盐岩矿区储气库的造腔优化及其稳定性、密闭性分析提供了理论参考,建议造腔前应优选地质层段,以同时满足稳定性和密闭性要求.
위료연구함경사비염협층염암체적변형여파손특성,개전료함경사협층염암시양적단축、삼축압축시험,병결합복합암체파배적이론분석,탐토료계면점결응력적변화규률급기영향인소,게시료경사층상염암체변형여파배특정급기궤제.연구표명,경사협층대염암체적변형여파손구유현저영향.협층각부파손형식여기소처위치유관;렬문재계면처최선맹생、진이확전도협층화염암층;시험관찰도염반적천정단렬현상병게시료기역학궤제;협층후도영향착염암체정체성능화파손특성,상대우박협층、중후협층경용역형성굉관렬문;위압작용감소료협층불동부위적파렬형태차이급계면점결응력차이.해결과위함지층경각염암광구저기고적조강우화급기은정성、밀폐성분석제공료이론삼고,건의조강전응우선지질층단,이동시만족은정성화밀폐성요구.
In order to reveal the deformation and failure characteristics of salt rock with tilted unsalted interlayer, uniaxial and triaxial compression experiments are carried out. With failure mechanism analysis of stratified rock mass, the variation and impact factors of bonding stresses are investigated;and the failure characteristics and mechanisms of tilted layered salt rock are revealed. The research indicates that tilted interlayer obviously affects the deformation and failure characteristics of rock samples. The failure patterns are related to the position of interlayer. Cracks initiate near interface firstly and then expand to interlayer and salt rock. Trans-granular fracture is observed and its mechanism is revealed. The overall performance of salt rock and characteristics of cracks are influenced by the thickness of interlayer; comparing with thin interlayer salt rock, macro crack tends to appear in the middle thick interlayer more easily. Confining pressure reduces the morphological difference of cracks in different positions of interlayer and the difference of bonding stresses on interface. The analytical result provides an important reference for the study of the cavern construction optimization and stability and tightness research of the salt caverns in the salt rock mineral area with stratum inclination. What’s more, optimizing the geological section to meet the demand of stability and tightness simultaneously is recommended before cavern construction.