Before a professional guardrail hydraulic piling machine enters the construction site, it is necessary to thoroughly understand the local environment and soil conditions and develop a construction plan. Previously, the general qualities of four types of soil were introduced, and today we will introduce four more. Soil filled with the first type of common soil is more common in older residential areas and industrial and mining areas, filled with waste soil generated from people's lives or production, usually consisting of construction waste, household garbage, and industrial waste. It is divided into waste soil. If the composition is complex, not planned for accumulation, and the thickness is uneven, the foundation should be treated first, because uneven settlement can occur due to differences in strength and compressibility at the same location. The second type is backfill, a man-made method of filling water, while the sedimentary soil layer is a natural base. The characteristics of backfill soil are as follows: after backfilling, the water content decreases, the surface naturally cracks, but if the drainage conditions are poor, the backfill soil at the bottom of the soil layer continues to flow, and the finer the particles of the refilled soil, the clearer the flow. 2. A clear phenomenon is that coarse particles first settle near the entrance of the mud, and the finer particles that settle downwards, the deeper they go, the more pronounced the stratification. 3. The initial strength of the eroded soil is very low and reaches a solidified normal state over time, mainly depending on the uniformity of the particle composition, drainage conditions, and the waiting time after cleaning.

The second common type of soil is that when the local layer of saturated loose sand vibrates, it expands and deforms and loses its bearing capacity. To reach a new equilibrium, the position of particles is displaced, leading to excessively high pore water pressure. The extrusion method or vibration method is commonly used to eliminate the possibility of liquefaction under dynamic loads and achieve a more compact state. The fourth type is collapsible loess, which is a special soil that, when submerged under the action of gravity and additional forces, destroys the soil structure and causes deformation. When building on collapsible loess with a piling machine, it is necessary to choose the appropriate treatment method to avoid or eliminate the damage caused by foundation collapse or minor collapses.