Dynamic compaction treatment is a very important part of dynamic compaction. The stability of dynamic compaction foundation ensures the integrity of dynamic compaction construction. Dynamic compaction foundation is the key of dynamic compaction construction. The mechanism of dynamic compaction is complex, and its reinforcement mechanism is also different according to the type of foundation and reinforcement characteristics.
强夯加固机制需要从两个方面进行分析。一是分析了加固区土受到的冲击力、应力波的传播、土的强度对土的加密的影响,是强夯加固的基础;二是在夯土作用下,土的结构发生变化。
Dynamic consolidation mechanism needs to be analyzed from two aspects. First, the impact force on the soil in the reinforcement area, the propagation of stress wave and the influence of soil strength on soil densification are analyzed, which is the basis of dynamic compaction reinforcement; Second, under the action of rammed earth, the structure of Earth changes.
目前强夯法加固地基的过程分为以下四个阶段。
At present, the process of foundation reinforcement by dynamic compaction method is divided into the following four stages.
(1)夯土是力量转换的过程,与夯土一起强制压缩或振动,使气体排出;
(1) Rammed earth is a process of force conversion. It is forced to compress or vibrate with rammed earth to exhaust gas;
(2)强夯地基的土体结构受损、体液化、降低强度、失去剪切强度;
(2) The soil structure of dynamic compaction foundation is damaged, the body is liquefied, the strength is reduced and the shear strength is lost;
(3)加固地基,完成排水固结压实,改变渗性能,土体裂隙进一步扩大,土体强度提高
(3) Strengthen the foundation, complete drainage, consolidation and compaction, change the permeability, further expand the soil cracks and improve the soil strength
(4)触变性恢复的同时固结压力变密,自由水的一部分变成薄膜水,土体强度持续上升。
(4) At the same time, the consolidated part of the soil becomes watertight, and the contact strength becomes a part of the consolidated film.