软土地基上箱筒型基础防波堤静力离心模型试验研究

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摘要利用离心模型试验研究新型箱筒型基础防波堤在水平静荷载作用下的工作性状和稳定性。通过在箱筒型基础防波堤上的波浪荷载合力作用点处施加水平静荷载直至达到极限状态，得到水平静荷载作用下防波堤的位移和地基土体中超静孔压响应。试验结果表明：设计荷载作用下防波堤结构的位移较小，荷载达到约2.2倍设计值时，荷载–位移曲线出现拐点，当荷载达到约3倍设计值时达到极限状态，防波堤发生向港侧的水平位移、港侧基础筒下沉、海侧基础筒上升以及向港侧的倾斜；荷载作用下港侧基础筒周围土体中的孔压增大，海侧基础筒周围土体中的孔压降低，港侧基础筒内的超静孔压始终大于筒外的超静孔压，荷载较小时海侧基础筒内的负超静孔压大于筒外的负超静孔压，而荷载较大时筒内的负超静孔压略小于筒外的负超静孔压。

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	蒋敏敏1
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关键词 ：土力学, 离心模型试验, 箱筒型基础防波堤, 软土地基, 位移, 超静孔压

Abstract：The stability and mechanism of a new bucket foundation breakwater under horizontal static load are studied with the centrifugal model tests. By applying horizontal static load on bucket foundation breakwater until ultimate limit state，the displacement of structure and pore pressure response in foundation can be obtained. Test results indicate that the displacement of structure under design load is very small；load-displacement curve has an inflexion under 2.2 times design load；when load is greater than 2.2 times design load，displacement of the structure develops fast with increasing load. Under about 3 times design load，the structure approaches the ultimate limit state，the breakwater moves toward the harbor ward side，the harbor ward base cylinder sinks while the seaward base cylinder raises，and the breakwater rotates toward the harbor ward side. In addition，the pore pressure of foundation increases in landward and decreases in seaward under horizontal static load，excess pore pressure in bucket is larger than that of outside the bucket in landward；under low load level the minus excess pore pressure in bucket is larger than that of outside the bucket in landward，while under high load level the minus excess pore pressure in bucket is smaller than that out of the bucket.

Key words： soil mechanics centrifugal model test bucket foundation breakwater soft soil foundation displacement excess pore pressure

引用本文:

蒋敏敏1，2，蔡正银1，徐光明1，顾行文1. 软土地基上箱筒型基础防波堤静力离心模型试验研究[J]. 岩石力学与工程学报, 2010, 29(S2): 3865-3870.
JIANG Minmin1，2，CAI Zhengyin1，XU Guangming1，GU Xingwen1. EXPERIMENTAL STUDY OF CENTRIFUGAL MODEL OF BUCKET FOUNDATION BREAKWATER ON SOFT SOIL FOUNDATION UNDER STATIC LOAD. , 2010, 29(S2): 3865-3870.

链接本文:

https://rockmech.whrsm.ac.cn/CN/Y2010/V29/IS2/3865

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