Abstract:According to Code for Design of Building Foundation GB50007—2011,the layer-wise summation method can be used to calculate the resilient deformation,and the corresponding calculation formula is provided. Since it is difficult to determine the resilient modulus and the calculation depth in practical applications,which directly affect the accuracy of calculation. By analyzing resilient test results of samples from different regions and with different kind of soils,it is found that the resilient modulus of complete unloading (Ec0) has approximately linear relationship with the initial unloading pressure (p);the logarithmic curves can be used to fit the curves of Ec/Ec0-R under different initial unloading pressures. Besed on these rules,the method of determining resilient modulus is put forward,which can be used to determine resilient modulus of the same soil layer under different initial unloading pressures and different unloading ratio. Furthermore,some suggestions are given on the procedure and the quantity of resilient tests. Hence,the problem on taking the resilient modulus in Codes the resilient deformation calcalation can be resolved. The calculation depth for resilient deformation can also be determined by referring to the stain ratio method suggested in the Code for Design of Building Foundation GB50007—2011. When the soil beneath foundation is relatively homogeneous,the stress ratio method may be employed to determine the calculation depth of resilient deformation. The unloading ratio of 0.4 may be used to determine the calculation depth which can be taken as a criterion,and then a coefficient table for the calculation depth is given. Based on some examples,it is observed for the homogeneous subsoil that the calculation depth of resilient deformation determined by the stress ratio method agrees well with that determined by the stain ratio method.
王曙光 李钦锐 李建民. 地基回弹变形计算若干问题探讨#br#[J]. 土木工程学报, 2020, 53(8): 108-115.
Wang Shuguang Li Qinrui Li Jianmin. Discussion on some issues of resilient deformation calculation. 土木工程学报, 2020, 53(8): 108-115.