Experimental Study on Damage Breakage Properties of Shaft Lining Concrete under Hydromechanical Coupling
Experimental Study on Damage Breakage Properties of Shaft Lining Concrete under Hydromechanical Coupling
复制标题
水力耦合作用下竖井衬砌混凝土损伤破坏性能试验研究
DOI：
10.1155/2018/1671783
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发表时间：
2018-03
影响因子：
--
通讯作者：
Xie Dezhu
中科院分区：
文献类型：
--
作者：
Xue Weipei;Yao Zhishu;Jing Wei;Tang Bin;Kong Gan;Xie Dezhu
井壁混凝土长期暴露在复杂的应力环境和高地下水压力的耦合作用下。为研究井壁混凝土在上述特定工况下的损伤破坏特性，制备了满足工程应用要求的井壁混凝土试件。进行了三轴液力偶合渗透试验，设计渗透压力分别为4 、6 、8 和10 。结果表明，随着渗透压力的增大，井壁混凝土的峰值强度逐渐降低，试件表面裂缝增多，破坏模式为斜剪破坏。根据井壁混凝土在加载过程中渗透率-应变和应力-应变曲线的变化特征，将其划分为压实阶段、渗透性突增阶段和峰后渗透性变化阶段。此外，建立了井壁混凝土在围压和渗透压力影响下的本构模型，理论曲线与试验曲线吻合较好。损伤演化模型表明，由于渗透水的影响，井壁混凝土的损伤门槛比普通混凝土出现得更早，尤其是应变软化阶段的损伤发展尤为迅速。
Shaft lining concrete is exposed to a long-term coupled effect of a complex stress environment and high underground water pressure. To study the damage breakage properties under the above specific working conditions, shaft lining concrete specimens meeting the requirements of engineering application were prepared. The triaxial hydraulic coupling permeability test was conducted, and the designed osmotic pressures were 4 MPa, 6 MPa, 8 MPa, and 10 MPa. The results show that as osmotic pressure increases, the peak strength of shaft lining concrete decreases gradually, the surface cracks of specimen increase, and the failure mode is oblique shear failure. According to variation characteristics of permeability-strain and stress-strain curves of shaft lining concrete during loading, it is divided into three stages: compaction stage, sudden increase of permeability stage, and postpeak permeability change stage. In addition, the constitutive model of the shaft lining concrete with the influence of confining pressure and osmotic pressure was established, and the theoretical curve is in good agreement with the test curve. The damage evolution model shows that damage threshold of shaft lining concrete occurs earlier than that of ordinary concrete because of the influence of permeable water, and the damage development of the strain softening stage is particularly rapid.
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