摘要:
汶川地震后,公路岩质边坡结构面发育,极易失稳形成崩塌。从发育的多组结构面中选取典型的结构面作为形成崩塌的控崩结构面,并通过对结构面所处边坡的工程地质条件分析得出控崩结构面的选取原则;考虑控崩结构面与边坡临空面的空间位置关系,运用赤平投影解法重点分析一组和两组控崩结构面与边坡临空面的图解关系;将震后公路边坡发生崩塌分为三种类型:滑移式、坠落式和倾倒式,结合边坡岩性、坡形、坡度、坡高等因素,得到了震后公路边坡崩塌三种类型的判据;将其应用到汶川地震后映秀—卧龙公路沿线边坡发育的典型崩塌中,得出的崩塌类型与实际相符。
Abstract:
After the earthquake,there grows structural surfaces in highway rocky slope,they easily become unstable to collapse.Choose the typical structural surfaces from many ones as structural surfaces controlling rockfall,then analyze the engineering geological conditions of structural surface in the slope,selecting principles of structural surface controlling rockfall are obtained.Considering the space position between structural surface controlling rockfall and free face of the slope,using stereographic projection method,emphatically analyze the space relation between a group or two structural surfaces controlling collapse and free face of the slope.Post-earthquake collapses happened to highway slope are divided into three collapse types,including sliding type,toppling type and falling type.Combined with factors including slope lithology,slope shape,slope gradient and slope height,the criterion of three collapse types for post-earthquake highway slope are obtained.Collapses types from the given criterion using the typical collapses growing in highway from Yingxiu to Wolong are in accord with the actual condition.
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