Abstract:In order to investigate the effect of soft rock softening behavior on uniaxial compressive properties,the limestone of Taiyuan formation of No. 1 coal floor in Chensilou Coal Mine,Henan Province is selected as experimental materials. Under three different loading rates,uniaxial compression tests were carried out on the samples under different soaking times,and the soaking effects on the compressive properties of limestone were obtained. The results of the study are as follows:at a certain loading rate,the compressive strength and elastic modulus decrease gradually with the increase of soaking time,and the decreasing extent e is smaller and smaller. With the increase of soaking time,the specimen changes gradually from elastic deformation to plastic deformation,but the limit strain is basically unchanged. The total strain energy and elastic energy are exponentially reduced,and the variation of dissipation energy with immersion time can be fitted by linear relation.