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清水浦大桥130 m深钻孔桩既要穿越30 m左右的淤泥质土层,又要穿越20 m左右的高含砂率亚黏土层,最终还要进入68 MPa的弱风化砂砾岩层6~7 m,在如此复杂的地质条件下,为取得良好的效果,需要采取多项管理、技术措施,重点对钻机参数选择、垂直度控制、沉渣厚度控制、导管埋深、泥皮厚度控制等方面进行深入分析。
The 130 m deep bored piles of Qingshui Pu Bridge not only pass through the muddy soil layer of about 30 m but also pass through the high sand content of sub-clay layer of about 20 m, and finally enter the weakly weathered gravel layer of 68 MPa at 6-7 m. Under such complex geological conditions, a number of management and technical measures need to be taken in order to achieve good results. The key points are the rig parameters selection, verticality control, sediment thickness control, conduit depth and mud thickness control In-depth analysis.