无损检测方法在水泥搅拌桩质量控制中的应用探讨

本研究基于现场试验探讨了低应变反射波法和地质雷达测试两种无损检测方法评价水泥土搅拌桩加固效果的可行性。试验结果表明,低应变反射波法既可通过时域曲线识别桩体缺陷,又能根据波速判断桩体强度,但在测试过程中,需有针对性的优化测试方法,且其对超过6 m长桩桩底反射不明显,对初始含水率较大地层容易产生误判反射波。地质雷达探测只能简要识别桩基位置,但对桩基缺陷及完整性无法识别,不适用于水泥搅拌桩的质量检测。

Discussion on Application of Non-destructive Testing Method in Quality Control of Cement Mixing Pile

Two non-destructive testing methods consist of low-strain reflected wave method and Ground penetrating radar(GPR)method,which are used to detect the reinforcement effect of cement mixing pile.The feasibility of the above two methods is analyzed by field test.The results show that the low-strain reflected wave method can be used to identify the pile defect through time domain curve,and to judge the pile strength according to wave velocity.However,a targeted optimal test method is required during the test,and there is no obvious reflected wave against the bottom of over 6 m long pile,even misjudged reflected wave against the stratum with high initial water content.GPR can only be used to identify the position of pile foundation,which is not suitable for the quality inspection of cement mixing pile.