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Municipal Road Construction Treatment of Soft

[Abstract] not in the construction of municipal road projects, soft foundation problem has an impact on the quality of road construction cost and one of the main factors. This paper discusses several commonly used municipal road construction site treatment method of soft ground. [Key words] soft surface treatment of municipal road drainage and consolidation 1 Introduction DJM in soft soil to build roads,[link widoczny dla zalogowanych], road settlement often occurs, a serious impact on road use, thereby economic losses caused by growing. In recent years, not in the construction of municipal road projects, soft foundation problem has an impact on the quality of road construction cost and one of the main factors. Chinese papers League finishing. This paper, the engineering practice to talk about the Yangjiang municipal roads soft approach. 2 surface treatment method to the surface of the surface treatment method for a very weak situation. The method by drainage, laying or add materials approaches to improve the surface strength, to prevent local shear deformation of the foundation to ensure the construction machinery operation; the same time as the filling evenly distributed load on the foundation. Belong to this approach are: surface water method, sand cushion method, laying material method, additives and so on. 2.1 of soil surface water method is better for soft ground caused by excessive moisture in the filling before the excavation trench to the surface and remove surface water. While reducing the moisture content of soil surface of the earth. To protect the construction machinery to pass. In order to play out of the trench excavation in construction to the effect of blind ditch should be a good permeable gravel or crushed stone backfill. Design and construction: (1) the arrangement of the groove groove layout should consider the use of the natural slope of the terrain drainage; fill slope should pay attention to changes in settlement; not to excavation sites from four weeks of surface water, seepage of water immersion filled with disabilities ; groove interval to encrypt as much as possible in order to increase the drainage capacity, even if some of the groove was cut off and will not prejudice the overall drainage. (2) the construction of the groove width of the groove size is generally taken 0.5m, depth 0.5 ~ 1.0m. Before filling in the groove well with permeable sand (gravel) backfill a blind ditch. Vertical blind ditch along the road of general or central longitudinal vertical excavation,[link widoczny dla zalogowanych], horizontal blind ditch the general layout of distance 10 ~ 15m. When the porous pipes laid within the groove. 2.2 sand cushion method very thin for the foundation and the upper soft soil water content is large, the soft pad on the deposition of about O.5 ~ l.2m thick sand cushion. This will achieve the consolidation of soft soil, sand cushion to play the role of the upper drainage layer; the same time, sand cushion and a layer of filling the underground drainage to reduce the water level within the fill; during the fill and foundation treatment construction for construction machinery to provide good traffic conditions. Design and construction: (1) mechanical construction, in determining the thickness of sand cushion should be considered when the weight of machinery, tire contact pressure on the ground, soft ground surface level and eccentric strength in a very soft foundation, only sand cushion to ensure the passage of large construction machinery, often requires thick sand cushion, is not economical, so often associated with surface drainage or dressing pad materials for law and order. (2) sand cushion construction should set a model release. 2.3 Enhancement Act geotextile geotextile manufacturing process is first processed into raw materials to the polymer filament, staple fiber, yarn, or strip, and then into planar structure of geotextile fabric. Geogrid is a major geosynthetics,[link widoczny dla zalogowanych], geosynthetic Tong and other than that it has a unique performance and efficiency. Geogrid plastic and glass is divided into two types of fiber. Using woven geotextiles and geogrid, laying on the soft ground surface, can play a filter, drain, isolation, and reinforcement of the role. 2.4 Additive clay for the surface layer, in the inside surface of clay into additives to improve the compression performance of the foundation and strength characteristics. In order to maintain the road construction machinery. Also useful in increasing the filling effect of stability and consolidation. Material is commonly used to add lime,[link widoczny dla zalogowanych], hydrated lime and cement. Add lime class material through on-site mixing, or mixing plant, in addition to reduced soil moisture, resulting in aggregate effect, the consolidation of the soil by the passage of time will occur with the chemical nature of consolidation, so that a qualitative change in the clay composition, thereby promoting soil stability.

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