ABSTRACT
The subgrade is an important part of the transportation system. Once it damaged in the earthquake, not only could create huge direct ecnomic loss, but also create difficulties to the rescue work. On 12 May 2008, a magnitude 8.0 earthquake occurred in WenChuan of Sichuan province, caused the destroy of many subgrade existed or in buliding such as overturn, remove and crack. Therefore, the research on emergency assessment of the subgrade damaged in earthquake has practical significance to the structure seismic performance evaluation and the earthquake emergency. In this paper, the key issues associated with post-earthquake emergency inspections of subgrades are presented, such as the forms of subgrade damage, the damage features under earthquake and the influence factors. Safety criteria are established and correlations of such criteria with various damage states are given. This paper presents the methods followed in the evaluation process, highlights the items for evaluation and intends to provide technical references for the post-earthquake disease prevention, diagnosis and disease treatment.
