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以孟加拉恒河主坝的标贯试验数据为基础,采用三维可视化的地质建模手段,对软基建坝可能出现的砂土液化工程地质问题进行空间分析和对比.结果表明:(1)坝区左岸的液化深度较右岸浅。(2)根据国内标贯法,闸区建基面均会液化,厂区建基面部分会液化。(3)根据国外简化seed法,闸区建基面右岸部分会液化,厂区建基面不会液化。(4)国内标贯法比国外简化seed法的液化临界深度深1~3 m,建议液化处理深度在高程-24 m。(5)对软基承载力的空间分布进行分析,结果表明厂区地基不满足承载力要求。本文研究成果为建基面的选择和地基处理提供依据。
Based on the standard test data of Ganges main dam and the three-dimensional visual modeling method, the spatial analysis and comparison of sand soil liquefaction engineering geological problems that may occur in soft foundation dam are carried out. The results show that: (1) The liquefaction depth of the left bank is shallower than that of the right bank. (2) According to the domestic standard method, the gate area will be liquefied, and some will be liquefied. (3) According to the simplified seed method abroad, the right bank part of the foundation area of the gate area will be liquefied, and the foundation area of the plant area will not liquefy. (4) Compared with the simplified seed method abroad, the domestic standard method has a liquefaction critical depth of 1 ~ 3 m deep, suggesting that the liquefaction depth is -24 m at elevation. (5) The spatial distribution of the soft foundation bearing capacity is analyzed, the results show that the foundation of the plant area does not meet the requirements of the bearing capacity. The results of this paper provide the basis for the choice of foundation and foundation treatment.