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为了能在贮灰场灰渣沉积层上建造子坝并保证子坝的稳定安全,即用上游法分级建造挡灰坝体达到减少贮灰场建设工程量与投资的目的,必须寻求一种加固极松软灰渣坝基的方法。本文叙述了松林山灰场用振动水冲法加固松软灰渣坝基的工程实例以及结合工程所进行的各项测试研究工作,包括灰渣物理力学性质的室内测定,振冲过程的动态测试,加固前后灰渣特性的现场测定,灰渣强度增长的测试分析及子坝稳定安全的计算分析。极松散的灰渣经过振冲加固变成紧密状态,灰渣的相对密度与干容重分别从0.09和8kN/m~3提高到0.65和9.5kN/m~3。紧密状态的灰渣与碎石桩群复合的坝基,其抗剪强度有显著的提高,满足了子坝抗滑稳定安全的需要。同时,碎石桩群改善了灰渣坝基的排水条件,有利于坝基的排水固结。根据振冲过程的动态测试分析,总结出振动加速度与动态孔隙水压力的分布规律,初步揭示了振冲法加固灰渣坝基的原理是振挤作用与人工液化重新固结作用的综合结果。
In order to build a sub-dam on the ash deposit of the ash storage yard and ensure the stability and safety of the sub-dam, an upstream method must be used for the purpose of reducing the construction volume and investment of the ash storage yard. Very soft ash residue dam foundation method. This paper describes the engineering examples of the Songlinshan ash field reinforced with viscous ash slag foundations by vibratory water rushing method and the various tests and researches carried out in conjunction with the project, including indoor measurement of physics and mechanical properties of ash slag, dynamic testing of vibroflotation process, reinforcement On-site measurement of ash residue characteristics before and after, test analysis of ash slag strength increase, and calculation and analysis of stability and safety of sub-dam. The extremely loose ash was turned into a tight state by vibroflotation. The relative density and dry bulk density of the clinker increased from 0.09 and 8 kN/m~3 to 0.65 and 9.5 kN/m~3, respectively. The dam foundation of the compacted ash and gravel pile group has a significant increase in shear strength, which satisfies the need for stability and safety of the dam. At the same time, the gravel pile group improved the drainage conditions of the ash residue dam foundation and was conducive to drainage consolidation of the dam foundation. According to the dynamic test analysis of vibroflotation process, the distribution law of vibration acceleration and dynamic pore water pressure is summarized. The principle of vibroflotation method for reinforcement of ash-dreg dam foundation is the integrated result of vibrating and artificial liquefaction reconsolidation.