Several soil improving systems are available to increase the geotechnical properties of low resistance soils and increase the stability of overlaying constructions. Most of the already available methods make use of injections of more compacted material inside the ground, like: micro-piles, sand compaction piles, stone columns or grouting. Most of these solutions requires vibrations and rotary drilling, which could compromise soil properties and overlaying building integrity. Recently an innovative soil improving system by injections of a sand/gravel mixture was developed by Novatek® through mechanical preload of the mixture by compression adopting a hydraulic jack. The advantage of this last system with respect to available methods is the absence of vibrations and rotary drilling operations. In this study, the application of this system is documented in a first trial test site in the central Po plain (Italy). Description of the system and of the executed injections are reported. Characteristics of the ground before and after injections are compared, using both geotechnical and geophysical tests, in order to evaluate the system performances, which were also ascertained with direct verification through an explorative trench. The first results reported, even if for limited application depths, highlight the good potentialities of the improving system with respect to the increase of geotechnical parameters in the treated soil.

有多种土壤改良系统可用于提高低阻力土壤的岩土特性，并提高覆盖结构的稳定性。大多数已经可用的方法利用在地下注入更密实的材料，如：微型桩、压沙桩、石柱或灌浆。大多数这些解决方案需要振动和旋转钻孔，这可能会损害土壤特性和覆盖建筑物的完整性。最近，Novatek® 开发了一种通过注入砂/砾石混合物的创新土壤改良系统，通过采用液压千斤顶的压缩对混合物进行机械预加载。相对于可用方法，最后一个系统的优点是没有振动和旋转钻孔操作。在这项研究中，该系统的应用记录在位于波普平原（意大利）中部的第一个试验场。报告了系统和执行注射的描述。使用岩土工程和地球物理测试对注入前后的地面特征进行比较，以评估系统性能，这些性能也是通过勘探沟槽的直接验证确定的。报告的第一个结果，即使对于有限的应用深度，也突出了改进系统在处理土壤中增加岩土工程参数方面的良好潜力。使用岩土工程和地球物理测试，以评估系统性能，这些性能也是通过勘探沟槽的直接验证确定的。报告的第一个结果，即使对于有限的应用深度，也突出了改进系统在处理土壤中增加岩土工程参数方面的良好潜力。使用岩土工程和地球物理测试，以评估系统性能，这些性能也是通过勘探沟槽的直接验证确定的。报告的第一个结果，即使对于有限的应用深度，也突出了改进系统在处理土壤中增加岩土工程参数方面的良好潜力。