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强夯发施工的三种不同的加固原理

网址:http://www.sddhfjx.cn/   发布日期:2022-05-13 关注次数:0
强夯法是地基处置中的物理法,应用冲击对土体进行密实处置,其原理主要是应用强夯机强大的夯击能,从而迫使土液化和动力固结,以使土体密实,强夯法主要是用以推进地基土的强度并降低紧缩性、消弭土的湿陷性、胀缩性和液化性,下面就来引见关于强夯法的三种不同的加固机理:
Dynamic compaction method is a physical method in foundation treatment, which applies impact to compact the soil. Its principle is mainly to use the powerful tamping energy of dynamic compactor to force soil liquefaction and dynamic consolidation to make the soil compact. Dynamic compaction method is mainly used to promote the strength of foundation soil, reduce compactness and eliminate soil collapsibility, swelling shrinkage and liquefaction. Here are three different reinforcement mechanisms of dynamic compaction method:
一、动力固结,当强夯法应用于处置细颗粒饱和黏土时,其加固机理则是动力固结理论,在运转操作时,庞大的冲击会在土中产生很大的应力波,从而破坏土体的原有结构,以此来使土体局部发作液化并产生许多裂隙,加大了排水通道,使孔隙水顺利逸出,待超孔隙水压力消散后,土体固结。由于软土的触变性,强度得到恢复。
1、 Dynamic consolidation: when the dynamic compaction method is applied to the treatment of fine-grained saturated clay, its reinforcement mechanism is the dynamic consolidation theory. During operation, the huge impact will produce a large stress wave in the soil, thus damaging the original structure of the soil, so as to make the local liquefaction of the soil and produce many cracks, increase the drainage channel, and make the pore water escape smoothly. After the excess pore water pressure dissipates, the soil will be consolidated. Due to the thixotropy of soft soil, the strength is restored.
二、动力密实,采用强夯法加固多孔隙、粗颗粒、非饱和黏土是基于动力密实的机理,即冲击型动力荷载,使土体中的孔隙减小,土体变得密实,从而进步地基土强度。
2、 Dynamic compaction: the reinforcement of porous, coarse-grained and unsaturated clay by dynamic compaction method is based on the mechanism of dynamic compaction, that is, impact dynamic load, which reduces the pores in the soil and makes the soil dense, so as to improve the strength of foundation soil.
三、动力置换,动力置换可分整式置换和桩式置换,整式置换是采用强夯将碎石整体挤入淤泥中,其作用机理类似于换土垫层。桩式置换是经过强夯将碎石填入土中,部分碎石桩(或墩)间隔地夯入软土中,构成桩式(墩式)的碎石桩(墩),其作用机理类似于振冲法构成的碎石桩,整体构成复合地基。
3、 Dynamic replacement: dynamic replacement can be divided into integral replacement and pile replacement. Integral replacement uses dynamic compaction to squeeze the gravel into the sludge as a whole, and its action mechanism is similar to that of soil replacement cushion. Pile replacement is to fill the gravel into the soil through dynamic compaction, and part of the gravel piles (or piers) are tamped into the soft soil at intervals to form a pile (pier) gravel pile (pier). Its action mechanism is similar to the gravel pile formed by vibroflotation method, which forms a composite foundation as a whole.
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