文章基于南京纬三路过江通道盾构施工壁后注浆工程实例，利用改进的非自立性材料三轴试验仪和试验方法，对其进行了固结不排水剪切试验。研究了壁后注浆浆体的孔压消散规律、固结过程中体应变规律和应力-应变关系，并实测了浆体的早期不排水强度和抗剪强度指标，为控制地表沉降和防止管片上浮提供了参数支持。研究结果表明：由于两种浆体的密度较大，在固结过程中产生的体应变都很小；硬性浆的水泥含量较低，对浆体的固结体应变、不排水强度和抗剪强度指标等的发展影响不大。%Based on backfill grouting in the Nanjing Weisan Road river-crossing tunnel, a consolidated-undrained shearing test was conducted with an improved triaxial apparatus for non-self-supporting materials; the pore pressure dissipation law for the backfill grout, the volumetric strain law and the stress-strain relationship during the consolidation process were studied; and the early undrained shear strength and shearing strength were measured, providing some helpful parameters regarding the control of surface subsidence and prevention of segment uplift. The results show that the volumetric strain of the two kinds of mortar is very low in the consolidation process because of their high density and the cemented mortar has little influence on the development of the consolidation volumetric strain, undrained shear strength and shearing strength due to low cement content.
展开▼
