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芦山“4·20”7.0级地震是继汶川地震之后又一次发生在四川省的强烈地震,此次地震中地基基础震害认识尚少。通过专门的地震灾害科学考察工作,发现雅安雨城区与芦山县龙门乡等地呈现不同程度的地面震陷现象,分析了结构震害与地基基础间的关系。结果表明,设置地圈梁的房屋的震害均较轻微,地面沉降的地区土层均较软弱,其中,雨城区为软粘土,龙门乡为填土,采用条形基础的房屋表现为地基下沉,而采用桩基础的结构表现为地面下沉。设置地圈梁并保持基础的整体性是减轻房屋结构震害的有效措施。
Lushan “4.20 ” magnitude 7.0 earthquake is another strong earthquake in Sichuan Province following the Wenchuan earthquake. There is little understanding of the damage caused by foundation damage in this earthquake. Through the special scientific investigation of earthquake disaster, it is found that there are different degrees of ground subsidence in Yucheng District of Ya’an and Longmen Township of Lushan County, and the relationship between structural damage and foundation is analyzed. The results show that the damage of houses with geo-ring beams is slight and the soil layers in the subsidence areas are relatively weak. Among them, Yucheng District is soft clay and Longmen Township is filled with earth. Houses with strip foundation are under foundation Shen, while the pile foundation structure showed the ground subsidence. It is an effective measure to reduce the seismic damage to the house structure by setting the geo-ring and keeping the integrity of foundation.