水泥搅拌土防渗墙无损检测标准的试验研究

Experimental study on standard of nondestructive detection for soil-cement cut-off wall

通过室内试验研究了水泥搅拌土的工程特性,分析了土类、龄期、养护条件、灰土比与水泥土抗压强度和剪切波速的关系。建立了强度预测模型。根据现场取样进一步建立了室内试验抗压强度与实际施工现场强度、室内波速与现场波速的相关关系。在此基础上提出以剪切波速作为无损检测指标,以评价水泥土防渗墙的均匀性,并给出了相应的标准,最后,利用强度预测模型可以确定抗压强度和评价抗渗性能。在实际施工现场,用面波仪,通过测量瑞利面波,推算不同深度处的剪切波速。文中给出了根据这一原理进行评价的流程框图和应用实例。

The properties of cement-soil material are experimentally studied in laboratory.The model describing the influences of soil characteristics, age, curing condition and cement to soil ratio on compression strength and shear wave velocity are analyzed and a model for forecasting the strength of this material is established.The relationships of strength and shear wave velocity between laboratory and engineering practice are further investigated. On this basis, the shear wave velocity is recommended as the index for nondestructive detection of soil-cement cut-off wall, and corresponding standards are given.The strength and permeability of the wall can be evaluated by means of the forecasting model.The flow chart for evaluation and an example of application are given.