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首页> 外文期刊>KSCE journal of civil engineering >Impact of Jet-Grouting Pressure on the Strength and Deformation Characteristics of Sandy and Clayey Soils in the Compression Zone
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Impact of Jet-Grouting Pressure on the Strength and Deformation Characteristics of Sandy and Clayey Soils in the Compression Zone

机译：喷灌压力对压缩带砂质黏土强度和变形特性的影响

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摘要

Jet-grouting as a soil improvement method is extensively preferred in today's civil engineering practice. High-modulus grout columns constructed by extremely high jetting pressures displace the surrounding soil causing a densification in soil particles. Accordingly, the strength as well as the deformation characteristics of subsurface soils are relatively improved across the compression zone which is under the influence of high jetting pressure. In this study, the modification of soil properties in compression zone after jet-grouting in sandy and clayey soils is investigated by standard penetration tests (SPT) and multi-channel analysis of surface waves (MASW) performed at a couple of construction sites along established jet-grout column rows. The in-situ test results point out significant improvement of the measured parameters compared to initial values. The rate of enhancement in the compression zone is higher in sandy strata than that of clayey deposits. The strengthening of soil due to jetting pressure is validated by finite element analyses as well. Furthermore, very low shear strain values are obtained in clayey soils with respect to the improved characteristics of compression zone representing extremely low shear deformation under foundation.
机译：在当今的土木工程实践中，旋喷灌浆作为土壤改良方法已被广泛采用。由极高的喷射压力构成的高模量灌浆柱会置换周围的土壤，从而导致土壤颗粒致密化。因此，在高喷射压力的影响下，整个压缩区的地下土壤的强度以及变形特性都得到了相对改善。在这项研究中，通过标准渗透试验（SPT）和沿已建好的几个施工现场进行的表面波多通道分析（MASW），研究了砂土和黏性土中喷射注浆后压缩区土壤性质的变化。喷射浆柱行。现场测试结果表明，与初始值相比，测量参数有了显着改善。砂质地层中压缩带的增速高于粘土质沉积物。喷射压力引起的土壤加固也通过有限元分析得到验证。此外，相对于代表地基下极低剪切变形的压缩带的改善特性，在粘土土壤中获得了非常低的剪切应变值。

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