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Improvement Efficacy of RJP method in Shanghai Soft Deposit

机译：RJP法在上海软矿区的改良效果

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摘要

This paper presents a case history on the efficacy of Rodin Jet Grout (RJP) construction in the soft deposit of Shanghai. The RJP columns were employed to improve the soft deposit in a deep excavated pit. The excavation depth was about 43 m. Jet grouting reached to the depth of 50 m, in which the soil types varied from soft clay, silt, stiff silty clay (SSC), and sand. Field construction was performed with different construction parameters such as jetting pressure, nozzle diameter, and retrieving speed. The diameter and mixing uniformity of the columns was measured and checked layer by layer during the excavation of the pit. The results showed that except for the layer SSC, the column diameter is over 1.8 m with the largest diameter of 3.3 m in soft clay layer at a depth of 15.3 m. In cohesive soil layer, mixing quality is good. However, in cohesiveless soil, although the eroding range reached 2.0, the soil and cement was separated and mixing uniformity was poor.
机译：本文介绍了罗丹喷射浆（RJP）施工在上海软矿区中的功效的案例。 RJP柱用于改善深基坑中的软沉积。开挖深度约为43 m。喷射注浆达到了50 m的深度，其中的土壤类型从软粘土，粉砂土，硬质粉质粘土（SSC）和沙土不等。使用不同的施工参数（例如喷射压力，喷嘴直径和检索速度）进行现场施工。在坑的挖掘过程中，测量并逐层检查塔的直径和混合均匀性。结果表明，除SSC层外，在15.3 m深度的软黏土层中，圆柱直径超过1.8 m，最大直径为3.3 m。在粘性土层中，搅拌质量好。然而，在无粘性的土壤中，尽管侵蚀范围达到2.0，但土壤和水泥被分离并且混合均匀性差。

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