Abstract
Relying on the geotechnical engineering survey project of Nanjing Lukou Airport, this research adopts the method of combining in situ and indoor testing to analyze the coefficient of soil foundation under different conditions (flow plastic, plastic, and soft plastic). Based on the differences in test results, in situ and indoor test methods appropriate for the benchmark bed coefficient of Nanjing soft soil area are proposed. Research findings depicted that the bed coefficients obtained by different methods are not similar; therefore, if the data obtained by different methods need to be compared and analyzed, they have to be unified as K 30 . Simultaneously, in the indoor test, this study compared the foundation bed coefficient obtained by the consolidation method, the improved K 0 instrument consolidation method, and the triaxial method. Results revealed that the improved K 0 instrument consolidation method can better realize the test of the soil foundation coefficient. This study can provide a reference for geotechnical investigation and design of soft soil in the study area.
Highlights
The foundation bed coefficient is an important parameter in the design of underground engineering such as foundation pit enclosure and underground rail transit; it is critical to determine its value [1–5]
The vertical bed coefficient obtained by different test methods is in the range of 94.3~195.3 MPa/m, and the difference between the maximum value and the minimum value is nearly 2.1 times
The analysis shows that the value of the base bed coefficient after the diameter correction tends to be the same for the in situ test, but the value obtained after the diameter correction differs significantly between the in situ test and the indoor test
Summary
The foundation bed coefficient is an important parameter in the design of underground engineering such as foundation pit enclosure and underground rail transit; it is critical to determine its value [1–5]. Sandu et al [6] deduced the calculation of the lateral foundation bed reaction coefficient based on the working mechanism of the flat shovel side expansion instrument formula. Based on indoor consolidation test and triaxial test, Wang et al [9] used the size correction empirical formula to correct the bed coefficient directly determined by the indoor test. Previous research indicates that the bed coefficient was primarily used for comparing the flat shovel side expansion test, indoor consolidation, and triaxial test [29–32]. It was rarely verified with the benchmark value of the K30 test, and there was no related test using the K0 instrument.
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