Seismic Landslide secondary disa sters to life and property of the people in southwest mountain have caused tremendous losses. At present, the research on influence of landslide deformation failure characteristics and residual strength remains to be studied. In particular, the influence of vibration parameters on the strength of residual soil has not yet formed reference materials. Based on the indoor dynamic triaxil test, we carried out multiple sets of unsaturated soil samples and test them by changing the amplitude, vibration frequency and vibration cycle with the use of orthogonal design method. The impact on soil moisture content was particularly strong when moisture content was 16%. Residual strength of the soil was large and with increasing moisture content of soil strength tended to decrease. The greatest impact on the residual saturated strength after the vibration of unsaturated soil by utilizing orthogonal test was the set of vibrating parameters [amplitude 2 (mm) - cycles 8 -frequency 1.5 (Hz)]. The four factors affecting the landslide strength according to variance analysis ranked as the soil moisture content, amplitude, times of vibration and vibrational frequency. The result can be combined with the regional precipitation and ground motion parameter zoning map and provides the reference to design for subsequent regional landslide disaster management.%地震滑坡次生灾害给我国西南山区人民的生命和财产造成了巨大的损失。目前对扰动条件下的滑坡岩土体变形破坏特征和残余强度的影响规律研究不够深入，尤其是振动参数对残余土体强度影响排序方面更是未形成有效参考资料。基于室内动三轴试验制备了多组非饱和土样，采用正交设计方法，通过改变振幅、振动频率和振动周次，分析了扰动对滑坡土体剪切强度的影响规律。结果表明：含水率对土体强度的影响最为明显，土体的残余强度随着含水率的增加而增加，含水率大于16%时，呈现出逐渐减小的趋势。筛选出对土体残余强度影响最大的振动参数组合为：振幅(2mm)-周次(8次)-频率(1.5Hz)，其影响程度依次为：含水率﹥振幅﹥振动周次﹥振动频率。试验结果结合区域内的降水与地震动参数区划图，能为区域滑坡灾害防治工作提供设计参考。
展开▼
