Experimental study on mechanical properties of cement soil under different stress curing conditions
In order to better explore the influence of curing stress on mechanical properties of cemented soil,a curing device and corresponding testing methods for cemented soil samples under constant temperature and isotropic or deviatoric stress conditions were developed.Using this curing device,the specimens of cemented soil subjected to isotropic or deviator stress were prepared under varying curing time.The unconfined compression tests were carried out on these specimens of cemented soil to obtain the stress-strain relations as well as the evolution patterns of UCS and E50 of cemented soil over the curing time.The following findings were obtained in this work:the UCS and E50 of cemented soil specimen under ages of 7 and 14 days increased with the confining stress increasing from 0.1 to 0.3 MPa but decreased with the rise of confining pressure under 28-day curing time.The UCS values of cemented soil specimens under 0.3 MPa confining stress was less than those of the unconfined specimens,i.e.,the high confining stress in curing period could reduce the strength of cemented soil.For cemented soil specimens with different axial pressure ratios,the increases in UCS at 60 days can be observed under small deviator stress,while the decrease in UCS can be observed under large deviator stress.The strength of cemented soil specimens increases when cured under small deviator stress(axial stress ratio less than the critical axial stress ratio),while it decreases when cured under large deviator stress(axial stress ratio greater than the critical axial stress ratio).Based on the regressive analyses of the test results,the growth models of the UCS and E50 accounting for the confining stress under the curing condition of isotropic stress as well as the correlations of the UCS and E50 with the axial stress ratio under the curing condition of deviator stress were established,respectively.The findings could provide insights for the impact of environmental conditions on the mechanical properties of cemented soil,and guide the engineering practices for cemented soil applications.It has promising theoretical and practical engineering significance.
cemented soilunconfined compressive strengthdeformation moduluscuring of isotropic stresscuring of deviatoric stress
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