Abstract: Based on the mining environment and stress characteristics of the filling body in the upward horizontal layered
filling mining method,with the number of dry-wet cycles and the ash sand ratio as variables,uniaxial compression tests and nuclear
magnetic resonance spectroscopy were conducted on the filling body after different ash sand ratios and dry-wet cycles. The
energy dissipation and damage evolution laws of the filling body were explored,and the relationship between energy,damage,
and porosity was analyzed. The study results show that ① after seven cycles of dry-wet cycles,the total energy required for the
filling body with ash sand ratios of 1∶4,1∶6,and 1∶8 to reach peak stress decreased by 3. 00×10-3 J,1. 25×10-3 J,and 4. 30
×10-3 J,respectively. The energy storage limit of the filling body is negatively correlated with the number of cycles,and the decrease
in the ratio of elastic strain energy to total energy indicates a decrease in the compressive performance of the filling body
and a reduction in the internal stored elastic strain energy. ② The peak stress damage of the filling material is positively correlated
with the number of cycles and follows an exponential growth law. The damage evolution process of the filling body can be
divided into two stages:stable damage development and rapid damage growth. The dry-wet cycle mainly affects the pre peak
strain stage,and as the number of cycles increases,the growth rate of the damage development stage gradually increases. ③ The
damage mechanism of the filling body under the action of dry-wet cycles can be summarized as follows:The repeated entry and exit of water cause the loss of weakly cemented products inside the filling body and the expansion of micro-cracks. The alternating
dry-wet action makes the defects of the filling body continuously develop and the damage continuously accumulate,ultimately
leading to the deterioration of the performance of the filling body.