软黏土中吸力锚承载特性离心试验研究  

Centrifuge modelling of suction anchor subjected to inclined load in soft clay

作　　者：熊根 付栋康 朱斌[2] 赖莹 XIONG Gen;FU Dong-kang;ZHU Bin;LAI Ying(Power China Hudong Engineering Corporation Limited,Hangzhou,Zhejiang 311122,China;College of Civil Engineering,Zhejiang University,Hangzhou,Zhejiang 310058,China)

机构地区：[1]中国电建集团华东勘测设计研究院有限公司,浙江杭州311122 [2]浙江大学建筑工程学院,浙江杭州310058

出　　处：《岩土力学》2024年第5期1472-1480,共9页Rock and Soil Mechanics

基　　金：国家自然科学基金项目(No.52279112,No.51890912)。

摘　　要：加载倾角和系泊点位置是吸力锚基础最重要的设计要素之一,能够改变锚体的破坏姿态以影响极限承载力。在饱和软黏土地基中选择不同的加载倾角及系泊点位置进行位移控制下的张紧式吸力锚离心模型试验,利用六自由度磁力计装置定量分析了加载倾角和系泊点位置对吸力锚破坏姿态与极限承载力的影响。研究发现,系泊点位置在锚体约2/3高度时,吸力锚发生平动破坏,当加载倾角由35°变化至20°时,在相同的系泊点位置,吸力锚发生后仰破坏,归一化极限承载力稍增大,并且达到极限承载力后仍保持一定的承载力余量;系泊点位置在锚体2/3高度以上时,吸力锚发生前倾破坏,归一化极限承载力降低了25%左右,并且破坏后的承载力余量大大降低。无论破坏模式如何,均未发现锚内土塞与锚有明显分离。The loading inclination and mooring point position of a suction anchor are crucial design elements that can alter the failure posture of anchor body,thereby influencing the ultimate bearing capacity.In a centrifugal model test of tensioned suction anchor under displacement control in saturated soft clay foundation,different loading inclinations and mooring point positions were selected.The influence of these factors on the failure posture and ultimate bearing capacity was quantitatively analyzed using a six-degree-of-freedom magnetometer device.It was observed that when the mooring point position was at about 2/3 height of the anchor body,the suction anchor experienced translational failure.However,when the loading inclination angle changed from 35°to 20°at the same mooring point position,the suction anchor exhibited backward tilting failure and the normalized ultimate bearing capacity increased slightly.Even after reaching the ultimate bearing capacity,it still maintained a certain amount of load-bearing capacity margins.On the other hand,when the mooring point position was above 2/3 height of the anchor body,the suction anchor experienced forward tilting failure,leading to a decrease of about 25%in the normalized ultimate bearing capacity,and a significant reduction in the load capacity margin after failure.Regardless of the failure posture,no significant separation of the soil plug from the anchor was observed within the anchor.

关 键 词：离心模型试验 吸力锚 加载倾角 系泊点位置 破坏姿态 极限承载力 

分 类 号：TU470[建筑科学—结构工程]