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Objective: This study aimed to investigate the system stability of composite sesame paste under different processing conditions. Methods: The effects of heating temperature, stirring time, cooling procedure, filling temperature, and standing curing procedure on centrifugal oil separation rate of composite sesame paste were investigated, and the oil separation days of composite sesame paste under the condition of 47 ℃ heat preservation was recorded. Results: The best technological conditions of composite sesame paste were as follows: heating temperature of 55 ℃, stirring time of 20 min, cooling and cooling at 0 ℃, filling temperature of 40 ℃, standing and curing for 24 h. The centrifugal oil extraction rate of the composite sesame paste prepared under this technological condition was significantly reduced from 6.69% to 1.78%(P＜0.05), and its microstructure oil phase was evenly distributed and thereby a tight connection area was formed. Conclusion: The optimization of the process parameters of composite sesame paste can significantly improve the oil separation problem of the system. The composite sesame paste processed by this process has the best system stability.

Dynamic caustic experimental method and numerical simulation method were used to study the crack propagation rules and the tension/compression damage zone at the end of boreholes in the planar model.The results show that the effect of different length-diameter ratios on the crack propagation was significant.As the length-diameter ratio increasing,the crack propagation lengths increased and the expansion angles decreased.When the length-diameter ratio was 5/5,the crack propagation angle was about 90°.When the length-diameter ratio increased to be 20(30/1.5),the crack propagation angles decreased to be 40°.As the length-diameter ratios increased again,the crack propagation angled didn’t change any more.The numerical results are in good agreement with the experimental results,and Numerical simulation shows that small area of compression damage area formed in the area of the column hole,and “X” type tensile damage zone formed at the end of the hole,which lead to the formation of explosive crack easily at the end of the borehole.The radius of the tensile damage zone was approximately 5 times the radius of the compression zone around the borehole.