A THEORETIC BREAKDOWN CRITERION OF HYDROFRACTURING IN ROCK SALT     

Xiao Changfu YangYoukui Wu Gang Qiu Xiande Zhou Shiguang 《保鲜与加工》1992,(6):78-84

Experimental results of the basic mechanical properties and failure mode performed on rock salt demonstrate that rock salt is a typical and peculiar soft rock , whose" Young' s modulus/strength(E/S)"ratio is extremely small,and whose failure follows the deformation failure criterion. With these results,this paper develops a theoretic breakdown criterion of hydraulic fracturing in rock salt,which is based on the greatest tension strain failure theory and includes the vertical stress effects. It has been suggested that the critical tension strain should be determined from uniaxial compression tests. This theoretic criterion exceedingly agrees with experimental results and is applicable for every soft rock with small E/S ratio under various stresses.  相似文献   

我国马铃薯加工业发展现状及建议          下载免费PDF全文

王世光  吕黄珍  卢天齐  何亚凯  吕程序  杨炳南 《农业工程》2022,12(3):76-79

作为我国第4大主粮作物，马铃薯生产对保障国家粮食安全具有重要的战略意义。我国是马铃薯种植大国，却不是马铃薯产业强国，与世界发达国家相比，在品种、加工、产品、装备等方面还存在差距和不足。介绍了我国马铃薯加工业整体情况、目前存在的问题和短板，并从科技创新、产业发展等方面提出了具体建议。   相似文献