考虑卸荷带和岩体软化特性的某桥址边坡稳定性研究

为了综合分析卸荷带以及凝灰岩泥化夹层对某桥址边坡稳定性的影响,通过不同岩体强度加权计算得到凝灰岩及其泥化带综合强度,结合现场勘察结果,对凝灰岩及其泥化夹层的分布取上限值、平均值和下限值并确定了卸荷带岩体强度参数.在对岩质边坡破坏模式分析的基础上计算了自然工况、地震工况、桥基荷载作用工况、桥基荷载和地震荷载共同作用工况四...

Slope Stability Analysis of a Bridge Site Considering Unloading Zone and Rock Softening Characteristics

In order to comprehensively analyze the influences of unloading zone and tuff argillaceous intercalation on slope stability of a bridge site,the comprehensive strength of tuff and its argillaceous zone is obtained by weighted calculation of different rock mass strength.The upper limit value,average value and lower limit value are taken for the distribution of rock mass in unloading zone.Based on the analysis of failure mode of rock slope,the stability of typical slope of bridge foundation under natural condition,earthquake condition,bridge foundation load action condition,bridge foundation load and earthquake load combined action condition are calculated.The results show that under natural and seismic conditions,the most dangerous sliding surface of bridge site slope is at the front unloading zone,and the shear entrance of slope sliding surface moves to the position of middle edge bridge foundation under bridge foundation load;compared with natural condition,the maximum decrease of slope stability at bridge foundation is 23%and the minimum safety factor is 1.526,which is greater than 1.35 specified in engineering slope stability,the slope stability of the bridge site is judged comprehensively.