高渗透孔隙水压对井壁混凝土性能的影响

Influence of High Permeability Pore Water Pressure on Physical and Mechanical Properties of Shaft Lining Concrete

本研究考虑三个因素:水压(孔隙水压)、水压作用时间和强度等级对井壁混凝土物理力学性能的影响,采用SPSS19.0软件设计生成混合正交试验。结果表明:对于同一强度等级的井壁混凝土试件,当水压作用时间相同时,随着孔隙水压的增大,混凝土损伤加剧,力学性能劣化明显;3因素对混凝土力学性能损伤影响从强到弱顺序依次为:水压(孔隙水压)、混凝土强度等级、水压作用时间。孔隙水压作用后,井壁混凝土的初始弹性模量明显增大,峰值应变明显降低,泊松比则略微增加。

The physical and mechanical properties of shaft lining concrete were investigated by taking three factors into consideration:hydraulic pressure(pore water pressure),the hydraulic pressure action time and strength grade.A mixed orthogonal test was designed and performed by using the software SPSS19.0.The results indicate that for the concrete with the same strength grade and within the same water pressure action time,the concrete damage is aggravated and mechanical properties are deteriorated significantly with the increase of pore water pressure;three factors on concrete mechanical property deterioration in the order from strong to weak y are hydraulic pressure(pore water pressure),concrete strength grade and hydraulic pressure action time.After pore water pressure is applied,initial elastic modulus of the shaft lining concrete increases obviously,peak strain decreases considerably,but the Poisson’s ratio increases slightly.