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结合泉州某商业街基坑支护工程实例,通过理论分析及前期方案验证认为,上层孔隙潜水补给迅速、江水潮汐作用及饱和砂层难以加固是高透水性江心洲地区基坑支护面临的三个主要难点。在无同类工程经验可参考的不利条件下,针对特殊地质条件开展了现场原位试验,施工结果及基坑监测表明,采用双高压旋喷桩止水帷幕结合锚杆联合支护体系,成功弥补了水泥搅拌桩墙成桩难度大、止水效果差等缺陷,有效提高了止水帷幕的完整度和支护结构加固施工质量。
Based on the example of foundation pit supporting project of a commercial street in Quanzhou, through the theoretical analysis and preliminary scheme verification, it is concluded that the supply of the upper-level pore-submersible water is rapid, the tidal effect of the river and the hard-to-reinforce of the saturated sand layer are the three The main difficulty. In the absence of similar engineering experience can refer to the unfavorable conditions, the site for the special geological conditions in situ tests carried out, the construction results and pit monitoring shows that the use of double high pressure jet grouting pile curtain combined with bolt support system to successfully make up The cement mixing pile wall into a pile difficult, poor sealing effect and other defects, effectively improve the integrity of the water curtain and the support structure reinforcement construction quality.