Analysis of characteristic of stress dispersion on highway´s two-layered subgrade

Exploiting the potential value of dry crust can produce great technical economic benefitis in important projects, especially in highway engineering, but the characteristic of dry crust´s stress dispersion on two-layered subgrade needs further study at present. Based on the experimental road section of Xingtai-Linxi highway in soft soil area, the monitoring data of lamination settlement, which has been processed by virtue of theoretical formula and grey prediction, can reveal the characteristic of stress dispersion directly. Meanwhile, for resolving the difficulties created by the finiteness of actual data in relative research, a new factor of influence without conditionality is put forward, which can represent the contribution of geological condition to the effect of stress dispersion synthetically. The case study shows that the coefficients of stress dispersion obtained from actual data and other methods, such as theoretical arithmetic and numerical simulation, remain big errors, so the effect of application caused by the former methods should be paid close attention to.