干喷和湿喷混凝土的力学性能、破裂失稳机制及损伤规律研究分析

Investigation of Mechanical Properties,Fracture Instability Mechanism and Damage Law of Dry-Sprayed and Wet-Sprayed Concrete

与干喷混凝土技术相比,湿喷混凝土技术具有污染小、强度高、均匀性好等特点,能够显著提升建筑工程施工质量和建筑支护效果,近年来在国内外备受提倡。基于力学结构试验及声发射技术对干喷及湿喷混凝土的力学性能及损伤规律进行研究,结果显示,湿喷混凝土的抗压及抗拉强度、综合力学性能均好于干喷混凝土;干喷混凝土破坏时间较湿喷混凝土长、破坏尖峰较湿喷混凝土多、破裂面也大于湿喷混凝土;干喷混凝土的声发射信号特征量与幅值能量变化较大,材料的损伤程度不断加深,而湿喷混凝土的声发射信号特征量与幅值能量变化较小,材料的破坏过程较为缓慢,其基础强度及内部均质性较高。

Compared with dry-sprayed concrete technology,wet-sprayed concrete technology has the characteristics of small pollution,high strength and good uniformity,which can significantly improve the construction quality and construction support effect of buildings,and has been advocated at home and abroad in recent years.In the complicated construction with large structure and construction disturbance,the effect of building support is greatly improved.Based on mechanical structure test and acoustic emission technology,mechanical properties and damage law of dry-sprayed and wet-sprayed concrete are studied.The results show that the compressive and tensile strength of wet-sprayed concrete is greater than that of dry-sprayed one.The mechanical properties are better than those of dry-sprayed one;the dry-sprayed concrete has a longer failure time than wet-sprayed one,more fracture peaks than wet-sprayed one,and the fracture surface is larger than that of wet-sprayed one;the characteristics of the acoustic emission signal and the amplitude energy of the drysprayed concrete vary greatly,and the damage degree of the material is deepened,while the characteristic quantity and amplitude energy of the acoustic emission signal of the wet-sprayed one change less,and the damage degree of the material is slower.The basic strength and internal homogeneity are higher.