1. Because of many and big interstices in soft soil, and plenty water content in it, soft soil can be compressed easily. So soft soil has feature of strong compressibility. And quite bigger uneven settlements appear easily in soft soil foundation.
2. Under external pressure and disturbance, soft soil structures will be damaged, so it has weak resisting strength. Soft soil foundation will often occur landslide, settlement, collapse, etc. All these situations are mostly caused by pressure and vibration, which also proves soft soil’s weak resisting strength.
3. Owing to the peculiarity of soft soil sedimentary environment, soil textures’ evenness is not strong. If soft soil foundation has improper treatment, uneven settlement phenomenon will be happened.
4. According to experimental analysis, there is plenty water content in soft soil, at the same time, water permeability is poor. Same water content in different kinds of soil, soft soil water penetration speed is slower than others. So, it needs cost more time to settle soft soil when constructing buildings above soft soil foundation, which will also influence its foundation performance directly.
Self drilling anchor system combines functions of drilling, grouting and anchoring together, is suitable for loose and soft soil condition. Slurry fills interstices in soil texture from bottom to top, squeezes water and then it can reach the function of reinforcing soil body and supporting engineering.