依托钱塘江临江防洪潮古海塘保护研究课题,将MJS高压喷射工法应用于明清古海塘木桩桩基加固.为了研究MJS工法加固后木桩桩基的工作特性,试验现场开展了施工期塘身变形监测以及加固效果测试.变形监测内容为塘身沉降和水平位移,加固效果测试包含静力触探试验和单桩静载荷试验.变形监测结果表明桩尖MJS加固施工期间塘身沉降变形量较小,而塘身水平位移量较明显.加固效果测试结果表明,MJS工法桩半径可达1.5m以上,加固范围内土层力学指标提高明显;加固后木桩的荷载沉降曲线明显变缓且其单桩极限承载力提高60％以上.%The high-pressure jet method,MJS,was applied in the reinforcement of the timber pile foundation located at Ming-Qing ancient seawall based on the research subject on protecting ancient seawall of Qiantang River from flood.In order to investigate the performance properties of timber pile foundation reinforced by MJS method,the monitoring on the deformation of seawall and tests on the treatment effect were carried out on the field.The deformation monitoring includes the settlement and horizontal displacement of seawall,while the tests on the treatment effect consist of the cone penetration test and single-pile static load test.The deformation monitoring shows that the settlement of seawall reinforced by the MJS is small,however,the horizontal displacement is obvious.The tests indicate that the diversity of the radius of pile constructed by MJS method is more than 1.5m; the mechanical strength of soil is obviously improved; the slope of the load-settlement curve of the reinforced timber pile is slowed down,while the bearing capacity of singe timber pile is increased by more than 60％.
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