静力压桩挤土效应的防治措施探析

静压压桩具有低噪声、无振动、工期短、单桩承载力质量可靠等特点，但在施工过程中易产生挤土效应，对周围的工程地质环境造成不良影响：诸如使桩周围土体产生相当大的竖直隆起和水平位移，使邻近已压入的桩产生上浮，桩位偏移等。通过分析河（海）相、土台阶地及冲洪阶地的地基特点，对静力压桩时挤土效应及其施工时对周围环境的影响规律进行了总结，指出河（海）相沉积的阶地和土台阶的挤土效应影响量较小，冲洪阶地的静力压桩的挤土效应影响程度较严重，并根据不同情况，提出了相应的预防措施，为今后该地区静力压桩的施工提供参考依据。

Probe into Statically-jacked Pile Compacting Effect Control

The statically-jacked pile has characteristics of low noise, vibration free, short construction period and reliable single pile bearing capacity. But easy to produce compacting effect during construction, thus causes harmful effects on peripheral engineering geological environment, such as： soil body around the pile rather large vertical doming and horizontal displacement makes neighboring already pressed in piles floating upward, pile position migrated etc. Through fluvial （marine） terrace, soil stereobate and alluvial （pluvial） terrace foundation characteristic analyses, summarized impacting regularity of statically-jacked pile compacting effect to peripheral environment, pointed out that rather small compacting impact from fluvial （marine） terraces and soil stereobates, while rather serious compacting impact from alluvial （pluvial） terraces. According to different instances put forward corresponding prevention measures, thus can provide with referential basis for statically-jacked pile construction in the area henceforth.