高压旋喷桩加固预应力管桩桩端湿陷性土持力层施工技术

Construction Technology of Consolidation for Collapsible Soil at Pipe End of Pre-stressed Pipe Pile by High-pressure Rotary Jet Pile

摘要:

通过工程实例介绍了采用高压旋喷桩处理静压预应力管桩桩端湿陷性土层持力层的施工技术。由于原工程地质勘察报告没有提供桩端湿陷性土层的有关资料，在大量静压预应力管桩成桩且经静荷载检测均满足设计要求后，随着成桩时间的延长，成桩桩头发生自行下沉，在对桩作静载复测，确证此时桩的承载力不再满足设计要求，因而发现桩端持力层为湿陷性土层，并经复勘验证。这时对桩端湿陷性土层的加固施工存在诸多限制，这种特殊条件下，采取了针对性的施工操作、工艺流程、技术参数及措施。

Abstract:

The paper introduced the construction technology of consolidation for collapsible soil at pipe end of pre-stressed pipe pile by high-pressure rotary jet pile with an engineering case. When the subsidence of the pile end of pre-stressed pipe pile occurred in bearing stratum of collapsible soil with many restricted conditions for consolidation, the pertinent construction operations, technical processes, technical parameters and the countermeasures were adopted.