In situ tests simulating traffic-load-induced settlement of alluvial silt subsoil |
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| Institution: | 1. Université Paris-Est, Laboratoire Modélisation et Simulation Multi-Echelle, MSME UMR CNRS 2808, 5 bd Descartes, 77454 Marne la Vallée Cedex 2, France;2. CSTB Grenoble, Département Acoustique et Éclairage, 24 rue Joseph Fourier, 38400 Saint-Martin-d''Hères, France;1. School of Civil Engineering, Central South University, Changsha 410075, China;2. National Engineering Laboratory for High Speed Railway Construction, Central South University, Changsha 410075, China;3. School of Civil Engineering, Southwest Jiaotong University, Chengdu 610031, China;1. Research Center of Coastal and Urban Geotechnical Engineering, Zhejiang University, Hangzhou 310027, PR China;2. College of Civil Engineering and Architecture, Wenzhou University, Wenzhou 325035, PR China;1. Key Laboratory of Geotechnical & Underground Engineering, Ministry of Education, Tongji University, Shanghai 200092, China;2. Department of Geotechnical Engineering, Tongji University, Shanghai 200092, China;1. Shenzhen Institute, Shandong University, Shenzhen 518057, PR China;2. School of Civil Engineering, Shandong University, Jinan 250061, PR China;1. School of Civil Engineering, Shandong University, Jinan 250061, PR China;2. Qilu Transportation Development Group, Jinan 250101, PR China |
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| Abstract: | In China, The Yellow River delta is the youngest large river delta, and the low liquid limit alluvial silt is widely distributed there. The silt is easy to liquefy so that the silt subsoil shows large settlement under traffic load. At present, few in situ model tests were conducted to study the traffic-load-induced settlement of silt subsoil. Therefore, a falling-weight simulation equipment of traffic load was developed. By adjusting the technical parameters such as the falling height of the weight, different types of traffic loads can be well simulated. With the equipment, in situ tests were carried out to study cumulative settlement of silt subsoil in the Yellow River delta. Tests indicate that the settlement and excess pore water pressures rapidly grow initially and then tend to be stable with increasing the number of load cycles, and they also increase with the magnitude of the traffic load. When the load attains a threshold value, liquefaction takes place in the silt subsoil. After terminating loading, the pore water pressure rapidly decreases and the settlement increases simultaneously, while after one hour they tend to stabilize. Based on Chai–Miura cumulative deformation model of soil, the traffic-load-induced cumulative settlement of silt subsoil was calculated and compared with the test results. The calculated cumulative settlement with increasing number of load cycles agrees well with the test results, except the initial phase of cyclic loading where the settlement observed in the situ tests is overestimated. This is mainly because Chai–Miura model assumes undrained conditions while the subsoil under traffic loads is partly drained. |
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| Keywords: | Traffic load Alluvial silt Subgrade Cumulative settlement In situ tests |
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