科研之友
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摘要
The use of geotextiles in the treatment of roadbed caused by karst collapse has obvious advantages over traditional treatment methods. The effects of L/B (i.e., the ratio of anchorage length of geotextile to the width of active foundation in the collapse zone) on soil pressure, vertical displacement and fabric tension are studied by model test in laboratory, and it is compared with that of the non-reinforced condition. The results show that the earth pressure under the geotextile reinforced cushion in the subsidence area decreases rapidly after collapse occurs when the geotextile is used, and the soil pressure is zero due to the separation of geotextile from the bottom soil. The earth pressure at this point also decreases rapidly after collapse occurs in the case of no reinforcement, but it eventually tends to stable. When the anchoring length L = 2.0B, 1.0B, the geotextile has the similar ability in controlling the vertical displacement of the filling. It is obviously better than that of L = 0.5B and L = 0.25B. The geotextile tensile force in the stable zone decreases rapidly away from the collapsed zone. The tensile force is close to zero at the location with the distance of 1.0B away from the subsidence zone. The results show that the suitable length of geotextile is effective in treating the collapse of karst roadbed and backfilling process. ? 2020, Science Press. All right reserved.
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