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通过一系列原位试验和室内试验,研究了土层变化对湿喷桩成桩质量的影响。结果表明:土层变化影响区内湿喷桩强度仅为单一土层的30%~50%;由亚粘土层过渡到淤泥质(亚)粘土层的地基,土层变化影响区宽约1.6m,上覆土层中占1.2m,下伏土层占0.4m,呈不对称分布;该影响区域内,上覆土层对湿喷桩早期强度的影响大于下伏土层,且在上覆层中湿喷桩强度降至最低,其下降量达63%~68%,在接近土层分界面桩身强度开始增大,当到达影响区底面时,强度增大67%~100%,随之趋于稳定。
Through a series of in-situ tests and laboratory tests, the effects of soil layer changes on the quality of wet-jetted piles were studied. The results show that the strength of wet-jet pile in the affected area is only 30% ~ 50% of the single soil layer. The foundation affected by the transition from the sub-clay layer to the silt (sub) clay layer has a width of 1.6m , The overlying soil layer occupies 1.2m, the underlying soil layer occupies 0.4m, showing an asymmetric distribution; in the affected area, overlying soil layer wet wet jet pile early strength greater than the underlying soil layer, and in the overlying layer The strength of the wet jetting pile is reduced to a minimum, the descending amount reaches 63% ~ 68%, and the strength of the pile body begins to increase near the interface of the soil layer. When it reaches the bottom of the affected area, the strength increases by 67% -100% Stable.