As a kind of technique for improving the soft stratum, double pipe grouting technique has such advantages as light equipment, simple operation, mature technology and obvious effect, etc. On the aspect of improving the low-permeable stratum, the key point is to improve the controllability and reliability of grouting effect. Two engineering cases of dynamic deviation correction and soft stratum improvement are described to introduce the research results.%作为一种软弱地层的改良技术,二重管注浆技术具有设备轻巧、操作简单、工艺成熟、效果明显等优点.在对低渗透性地层的改良方面,关键是提高注浆效果的可控及可靠性.通过动态纠偏和软土地层改良两个工程实例介绍试验研究成果.
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