LI Cong,ZOU Qiang,JIANG Hu,et al.Disaster Response Characteristics of Rammed Earth Buildings to Debris Flow[J].Journal of Disaster Prevention and Mitigation Engineering,2022,42(01):42-50.
LI Cong,ZOU Qiang,JIANG Hu,et al.Disaster Response Characteristics of Rammed Earth Buildings to Debris Flow[J].Journal of Disaster Prevention and Mitigation Engineering,2022,42(01):42-50. DOI: 10.13409/j.cnki.jdpme.200201103001.
Disaster Response Characteristics of Rammed Earth Buildings to Debris Flow
It is of great significance for improving disaster risk management and guiding disaster prevention work to study the failure modes and dynamic response characteristics of rammed earth buildings subject to debris flow disasters in mountainous areas. Based on the field investigation of the Liangshan Jiendian debris flow incident, the paper summarized the failure modes of rammed-earth houses under the impact of the debris flow. By establishing an equal-scale rammed earth building model, the paper used the finite element method to obtain the displacement time history response and stress time history response of the structure and simulate the process of debris flow destroying the building. The results show: ① The damage modes of rammed earth housessubjectto debris flow are erosion, siltation and impact. Debris flow infiltrates into the room through the shrinkage cracks of the wall, causing the house to be buried, scours the foundation of the wall resulting in the collapse of the wall, and washing away the wall by carrying rocks. ②The impact failure of the wall by debris flow is characterized by crushing failure at the impact point, tensile failure at the inner side of the wall and shear failure at the corner of the wall; the damage of the longitudinal wall is the second failure caused by the debris flow when it destroyed the gable wall, rushed into the room and broke the doorway. ③Moreover, the integrity of rammed earth buildings is poor, and the cracks cut off the propagation path of stress, which effectively protects other walls. ④Under the impact of debris flow, the first damaged area of the rammed earth house is the wall base, corner and impact point of big stones. Therefore, to protect rammed earth buildings, the stress mutation positions such as wall foundation and corner should be reinforced first.
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