Features of interrelations between acoustic quality factor and strength of rock salt during fatigue cyclic loadings

Impact of Second Phase Content on Rock Salt Rheological Behavior Under Cyclic Mechanical Conditions

“…More work is thus necessary to improve our understanding of the deformation mechanisms and internal structural changes linked to this notable change in mechanical properties. Voznesenskii et al (2017) also recorded a decrease in dynamic Young's modulus-calculated from ultrasonic velocity surveys-during cyclic loading conditions of similar amplitude, with a subsequent increase after more cycles were applied. The decrease in Young's modulus and rock sample strength was interpreted as a result of inner material arrangements.…”

“…Yet, monitoring the elastic parameter variations (such as Young's modulus, Poisson's ratio, and Bulk modulus) at the early stage of the deformation behavior in relation to the different rock salt compositions would bring essential information on halite mechanical stability with respect to gas storage risks (Xiong et al 2015). Some authors show monitored acoustic emission from rock salt deformed under cyclic loading condition (Fan 2017;Voznesenskii et al 2017) and dynamic Young's modulus from velocities of the longitudinal P-and transverse S-waves through sounding of the samples (Voznesenskii et al 2017). This allows them to remotely observe the softening to hardening evolution of the halite when subjected to cyclic loading conditions.…”

Cyclic and Fatigue Behaviour of Rock Materials: Review, Interpretation and Research Perspectives

“…Measurement of wave velocity is one of the most common (Rao and Ramana 1992;Lockner 1993;Meglis et al 1995;Brantut et al 2014;Voznesenskii et al 2017). Microscopic thin sections are also often provided (Ghamgosar and Erarslan 2016;Wang et al 2017).…”

“…Further research works are devoted to protect against environmental threats: designing tunnels against earthquakes (Hashash et al 2001), forecasting volcanic hazard (Kendrick et al 2013;Heimisson et al 2015), assessing the freeze-thaw cycles on tunnels built in hostile cold regions (Zhang et al 2004;Liu et al 2015), studying the ageing of pillars due to variations of water table level (Sorgi and De Gennaro 2011) or estimating the long-term stability of old monuments (Cattaneo and Labuz 2001;Jamshidi et al 2013) or buildings (Hale and Shakoor 2003) against weathering. Oil and gas storage, mainly in salt mines, is another application where cyclic loading is imposed to the environment by human activities by successive emptying and filling (Cosenza et al 1999;Wang et al 2015;Voznesenskii et al 2017). The use of old mines as lower reservoirs for pumped storage hydroelectricity also generates cyclic Abstract The purpose of this paper is to provide a comprehensive state of the art of fatigue and cyclic loading of natural rock materials.…”

Структурно-Энергетические Закономерности Накопления Повреждений При Деформировании Гетерогенного Материала

“…Формирование и развитие разномасштабных трещин в механически нагруженном материале сопровождается выделением тепловой, акустической и электромагнитной энергии, связанным с разрывом межатомных связей, образованием новых поверхностей и сопутствующими процессами неупругого деформирования [1][2][3][4][5][6][7][8][9][10]. При этом пропорция диссипированной и запасенной в деформируемом материале энергии на различных этапах нагружения определяется как внутренними (состав, кристаллическая структура, дефектность), так и внешними (интенсивность и конфигурация приложенных нагрузок, температура) факторами [11][12][13][14].…”