EPS is a kind of light high molecular polymer,its full name is expanded polystyrene. It uses polystyrene resin to add a foaming agent, and at the same time it is heated to soften it to generate gas and form a rigid closed-cell structure foam. Its processing method can be divided into mode method and extrusion method according to different foaming methods. This uniformly closed cavity structure makes EPS have the characteristics of low water absorption, good heat preservation, light weight and high mechanical strength.
The eps geofoam can be very good materials for road foundation.
1.Laying EPS insulation layer to prevent freezing damage of roadbed Building roads in permafrost regions will cause local environmental changes, leading to the melting of permafrost and causing serious diseases or even damage to roads. The traditional methods of remediation of frost damage, such as pads, salt injection, soil replacement, and slag laying, are not satisfactory. Since the bubbles on the inner wall of the EPS material are closed and not connected to each other, the water absorption rate is small, and the frost resistance is good, which ensures that it has good heat insulation performance under water immersion conditions. The study of EPS board insulation subgrade test (1990) in the Kunlun Mountains section of the Qinghai-Tibet Highway shows that a 6cm thick EPS insulation layer can reduce the heat flow from the surface to the deep layer, reduce the downward movement of the upper limit of the underground permafrost layer, and slow down permafrost The freezing and thawing of the soil layer keeps the mouldingstructure stable and reduces deformation. The research results have been popularized and applied in the Chuma River approach, Hongliang River Bridge approach approach and the old hot spring area. From the current situation of the project, the road surface is solid and level, the roadbed is stable, and the overall strength of the roadbed and road surface meets the design requirements.
2.Reduce subgrade settlement, prevent or treat subgrade instability To build embankments on soft soil foundations, because of the high density of ordinary fillers, the additional stress of the foundation caused by its own weight will often cause excessive uneven settlement and settlement of the roadbed. Due to the low density of EPS and ultra-lightweight characteristics, after a certain depth of replacement, it can effectively reduce the weight of the embankment, reduce the additional stress of the foundation, reduce the settlement of the embankment on soft soil, and improve the stability of the foundation. Filling a 10m high EPS embankment is approximately equivalent to a 10cm high low-fill embankment load, and the embankment load is greatly reduced. Therefore, building an EPS embankment on a slope can effectively prevent landslides and improve the anti-sliding stability of the high embankment. EPS construction does not require special machinery, and can be constructed by manpower. It is fast and suitable for emergency rescue and disaster relief. It is more suitable for places where large machinery is difficult to use. It can be processed and cut on site to meet the terrain requirements of the site. The K42+650~K42+800 section of the first phase of the Taizhou section of the Yongtaiwen Expressway. In August 1998, during the construction of the soft soil subgrade too fast, the subgrade slipped and the ground arched 60cm. Due to the urgent construction period, the site was restricted by the 104 National Road and the outer factory buildings. The embankment was filled with EPS lightweight materials. The thick part is 6 layers and the thin part is 1 layer. The total amount is 7295m3. The filling was completed in October of the same year. Since the section was completed and opened to traffic at the end of 1998, the asphalt concrete pavement is smooth and in good condition.
3. Prevent the bridge head from jumping and reduce the lateral displacement of the bridge abutment Due to the particularity of the location of the bridge head (the junction of the bridge abutment and the subgrade), the construction quality of subgrade filling is difficult to control, and the difference in the structure of the bridge abutment and the embankment makes it easy to produce uneven settlement at the bridge head, which affects road life and driving comfort And security has a great impact. Reducing or controlling the differential settlement at the bridge head is a difficult problem in building embankments on soft foundations. Because EPS is extremely light in weight, using it as a filler at the bridge head can effectively reduce the settlement difference; at the same time, because of its good self-support, it can also greatly reduce the lateral pressure of the embankment on the abutment and reduce the side of the abutment. To displacement. During the filling of the back of the abutment on both sides of the Xintianwei Bridge (bridge center pile number K57+010) on the Huzhou section of the Hangning Expressway, the abutment was displaced. According to the construction period and the foundation treatment already adopted, the EPS lightweight embankment treatment plan was adopted. The EPS embankment at both ends of the Xintianwei Bridge is about 22m long, and the filling thickness gradually transitions from 6 layers (layer thickness 48.5cm) to 1 layer at the abutment, with a total amount of 2332m3. Construction of the EPS project started in March 2000, and the filling was completed in May, and it was completed and opened to traffic at the end of the same year. At present, the asphalt concrete pavement is in good condition, and there is no traffic jumping at the bridge head section.
4. Build upright embankments In the construction of steep slopes in mountainous areas and urban roads, in order to reduce land occupation and increase aesthetics, vertical embankments can be built using the characteristics of EPS’s strong independence and small lateral deformation. For highway project expansion, EPS can not only reduce the differential settlement caused by the splicing of new and old roads, it can also place steep slopes or even make vertical slopes, which is very beneficial for reducing secondary land acquisition and saving valuable land resource.
5. Reduce the impact on underground or adjacent buildings The uneven settlement of the soil on the upper part of the rigid structure buried under the embankment and the soil on both sides often produces excessive additional pressure on the top of the structure, the vertical earth pressure coefficient can reach 1.2, and even 2.0 when the filling is high , That is, there is a stress concentration phenomenon on the top of the structure, causing the underground structure to crack and damage. Using EPS instead of filling soil to pave on the top of the structure can improve the stress distribution on the structure, greatly reduce the earth pressure on the structure, and the earth pressure coefficient can be reduced to 0.3. When embankment construction is carried out in certain sections of urban areas, in order to protect the safety of underground municipal facilities and adjacent buildings, it is not allowed to carry out disturbance-type reinforcement treatment to the foundation, but it is necessary to control the embankment settlement. EPS is used as embankment filler to effectively reduce the embankment Weight to achieve the purpose of controlling settlement. In the original water pipe section of Century Avenue in Pudong, Shanghai, EPS was used to replace the earthwork in the upper part of the pipe area, and then the EPS was covered with soil for green planting. This not only enables the original water pipe canal to be fully and effectively protected, guarantees the normal water supply of the original water pipe canal, but also satisfies the overall planning and design of the square, enabling the overall concept of Century Avenue to be realized.
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