新疆叶尔羌河流域中游渠首水闸基础处理试验研究

Foundation Treatment Experimental Study of Canal Head Sluice in Xinjiang Yarkant River Basin

新疆叶尔羌河流域位于塔里木盆地的西缘,其中游渠首水闸地基主要持力层为粉细砂,结构为松散稍密、弱中等透水地层,存在地震液化、地基承载力较低、渗透稳定等问题。设计采用C20F150W 6钢筋砼灌注桩、高压旋喷桩、振冲碎石桩及钢性C20F150W 6砼防渗墙等多种形式相结合的方式处理水闸地基。为进一步论证设计的合理性及施工的可行性,针对粉细砂地层水闸地基基础处理进行了试验研究,进一步验证或确定了各种基础处理的技术指标,选择了合理的施工工艺及施工参数,从而为设计、施工提供了可靠依据,并起到了优化设计的作用。

The Xinjiang Yarkant River basin is located at Tarim basin＇ s west edge. The supporting layer of the sluice is the powder sands. The structure of the sluice ground is characterized by loose sands, slight density and the weak-medium water percolation soil stratum. There exist some questions about the foundation, including earthquake liquefaction, lower supporting capacity, the seepage stability, etc. A comprehensive sluice foundation treatment has been carried out in design stage, which includes the C20F150W6 steel bar concrete filling piles, the rotary spurt columns with high pressure, the vibration stone columns and the rigid C20F150W6 concrete cut-off wall, etc. To prove the design rationality and the construction feasibility, it is necessary to conduct the special experimental study to the foundation treatment. The article conducts the experimental study on sluice foundation treatment of the powder sand stratum, and the foundation treatment＇ s technical indexes in terms of reasonable construction techniques and the construction parameters corresponding to the measures have been confirmed. In a word, experimental study provided the reliable basis for the design or the construction and it has played a role in the optimizationdesign function.