论述水闸软基处理之水泥粉喷桩

何国光

摘要：水泥粉喷法是利用喷粉桩机,将水泥干粉喷入软弱土层中,并在原位进行强制搅拌,通过水泥和土的一系列复杂的物理化学作用形成水泥土桩体，使桩体与桩间土共同作用形成复合地基,达到提高承载力和减少沉降的目的。本文功运用事例,结合工程实际重点介绍了设计应注意事项、施工工艺、质量控制和检测等,说明水泥粉喷桩在沿海淤泥地区的适用性和可行性。

关键词：水泥粉喷桩地基设计施工工艺检测措施

Abstract: the cement powder spray method is using powder-spraying pile machine, will cement powder spray into the soft soil layer, and in the in situ for compulsory mixing, through the cement and soil of a series of complicated physical and chemical role in the formation of pile soil water, make the pile and soil formation common between pile composite foundation, to improve the bearing capacity and decrease settlement purposes. This paper work using examples, combined with the engineering practice introduced the design should be the points for attention and the construction technology, quality control and inspection, and shows the cement pile in the coastal areas of the feasibility and applicability of silt.

Keywords: cement pile foundation design construction technology test measures

中图分类号：TU447文献标识码：A文章编号：

工程概况

该水闸工程属Ⅳ等小（1）型建筑物,是集供水灌溉、御成蓄淡、防洪为一体的综合性水利工程。工程主要由水闸和上交通桥等建筑物组成,基础为淤泥质土软基，需对其进行加固处理。据钻探资料,场地土层分布如下:第一层:淤泥质土，流塑,饱和、高压缩性,含水量52.5～97.2％,干重度12.7kN／m3,孔隙比1.793，液性指数1.22,天然地基承载力60kPa,厚约14.6～18.0m；第二层：粉质粘土,可塑,中压缩性,含水量19.0～35.7％,干重度16.6kN／m3,孔隙比0.642,液性指数0.27,天然地基承载力120kPa,该层厚7.1～12.2m；第三层:粉砂、淤泥质细砂,稍密,厚4.8～7.7m,天然地基承载力180kPa；第四层：砂质粘性土,硬塑,揭露层厚5.8～11.8m,天然地基承载力350kPa。地下水有两种类型,① 层地下水为潜水,水位高低主。要受大气降水、河水位影响，雨季稍高；③ 层以下地下水具有承压性,该层含水与河水不直接连通，地下水主要受潜水越流补给。

1 地基处理设计

1.1方案比选及确定重建的地面工程均座落于淤泥上,天然地基承载力仅60kPa,需采取加固措施: