马来西亚东海岸码头堆场泥炭土地基中水泥搅拌桩的处置效果及参数分析

Treatment effect and parameter analysis of cement mixing pile in peat soil foundation of wharf yard on east coast of Malaysia

以马来西亚东海岸某码头内堆场水泥搅拌桩处理泥炭土工程为研究背景,开展水泥桩室内配合比试验、试桩终孔参数分析、试桩工效分析等工作,系统研究多种配合比条件下水泥搅拌桩复合地基的强度变化和处置效果。结果表明:由于两试桩点土层分布及工程性质不同,试桩点1采用16%、18%、20%3种配合比时,28 d芯样无侧限抗压强度(UCS)普遍高,强度富余度较大;试桩点2采用18%、20%、22%3种配合比时,7~9 m处强度低于其他深度,建议采用18%的水泥掺量;表层腐植土地段采用其他加固措施或挖除换填的工艺来保证施工质量。最终,使用水泥搅拌桩加固泥炭土可以取得较好的效果。

Based on the peat soil treatment project of cement mixing piles in the inner yard of a wharf on the east coast of Malaysia,we carry out the indoor mixing ratio test of cement pile,the final hole parameter analysis of the test pile,and the engineering efficiency analysis of test pile.Meanwhile,we systematically study the strength change and treatment effect of cement mixing pile composite foundation under various mixing ratios.The results show that due to the different soil layer distribution and engineering properties of the two test pile sites,the 28-day core unconfined compressive strength(UCS)of test pile site 1 is generally high with large strength surplus under the ratios of 16%,18%,and 20%.At test pile point 2,the strength at 7-9 m is lower than that at other depths when 18%,20%,and 22% are adopted,and thus 18% cement content is recommended.The surface humic soil section adopts other strengthening measures or excavation and replacement processes to ensure the construction quality.Finally,the utilization of cement mixing piles to strengthen the peat soil can yield good results.