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根式沉井基础是在普通沉井周围增加根键,利用根键带动基础周围更大范围内的土体承担荷载,使基础的承载力得以提高,是一种创新型的基础形式。根式锚碇基础是根式沉井基础的拓展,是通过承台把数根根式沉井群连接成群井基础,而形成的一种悬索桥锚碇基础。通过现场试验,分析根式沉井基础在水平荷载作用下对基础周围土体的影响范围和影响程度,为根式群井和根式锚碇基础的设计提供参考。研究发现:在水平设计荷载作用下,根式沉井基础对距基础中心2.5倍基础直径范围内的位置点,随着水平力作用方向的不同,影响程度也不同,多个根式沉井基础成梅花状布置时,基础间相互影响较小,2.5倍基础直径范围之外的土体所受影响较小。
The root caisson foundation is to increase the root key around the common caisson and use the root key to drive the soil to bear the load in a wider area around the foundation so as to improve the bearing capacity of the foundation. This is an innovative basic form. The foundation of the root anchorage is the expansion of the root sinking foundation, which is the foundation of the anchorage of the suspension bridge formed by connecting the root-sink-sink groups to the well base by the cap. Through the field test, the influence range and influence degree of the rooted caisson foundation on the soil around the foundation under the horizontal load are analyzed, which can provide references for the design of the root well group and the root anchor foundation. The results show that under the horizontal design load, the location of root caisson foundation within 2.5 times of the basic diameter from the center of foundation is different with different horizontal direction of action, and the multiple root caisson bases are plum blossom Shape arrangement, the interaction between the foundation smaller, 2.5 times the diameter of the soil outside the smaller affected.