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软土在强夯施工作用下土强度增长的几个阶段

网址:http://www.sddhfjx.cn/   发布日期:2020-12-11 关注次数:
不同的地基土在强夯效果下均会表现出三种加固特征:一是加密效果,以土体中气体的排出为特征;二是固结效果,以孔隙水的排出为特征;三是预加变形效果,以各种颗粒成分在结构上的重新排列以及颗粒结构和形状的改变为特征。从微观上来剖析,软土在强夯作用下土强度增长可细分为以下几个阶段:
Different foundation soils will show three kinds of reinforcement characteristics under dynamic compaction effect: first, densification effect, which is characterized by gas discharge in soil; second, consolidation effect, which is characterized by pore water discharge; third, pre deformation effect, characterized by rearrangement of various particle components in structure and change of particle structure and shape. From the microscopic point of view, the strength growth of soft soil under dynamic compaction can be divided into the following stages:
1、强夯加载阶段。在夯击的时分,夯击所发生的能量能是地基发生动应力,能够让孔隙中的水和气体逐渐遭到紧缩,当气体的百分比挨近零的时分,便变成了不行紧缩,这个时分孔隙中的水压上升,上升到与掩盖压力持平。
1. Dynamic compaction loading stage. In the time of tamping, the energy energy generated by tamping is the dynamic stress of the foundation, which can make the water and gas in the pores be compressed gradually. When the percentage of gas is close to zero, it becomes that there is no tightening. At this time, the water pressure in the pores rises to be equal to the covering pressure.

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2、卸载阶段。在夯击动能卸去的时分,动的总应力消失,可是孔隙水压力仍是在一个比较高的水平,此时的孔隙水压力比有用应力大,所以土体中存在较大的负有用应力,土体将发生液化,使得土体中发生缝隙,土的渗透性添加,孔隙水排出。
2. Unloading phase. When the kinetic energy of tamping is removed, the dynamic total stress disappears, but the pore water pressure is still at a relatively high level. At this time, the pore water pressure is greater than the useful stress, so there is a large negative useful stress in the soil, and the soil will liquefy, resulting in cracks in the soil, the permeability of the soil is added, and the pore water is discharged.
3、固结阶段。由于孔隙水压力的消失,土中的缝隙就会闭合,土颗粒的触摸要比强夯之前严密些,图的抗剪强度和变形模量答复添加。
3. Consolidation stage. Due to the disappearance of pore water pressure, the cracks in the soil will be closed, and the touch of soil particles will be tighter than that before dynamic compaction. The shear strength and deformation modulus of the diagram shall be added.
4、土的触变康复阶段。在孔隙水压力悉数消失后,土的抗剪强度和变形模量还会缓慢添加,逐渐到达加固的意图。
4. Soil thixotropic rehabilitation stage. After the pore water pressure disappears, the shear strength and deformation modulus of the soil will slowly increase, gradually reaching the intention of reinforcement.
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