三峡工程永久船闸中隔墩岩体变形全过程测试研究

RESEARCH ON DEFORMATION MEASUREMENT OF WHOLE PROCESS FOR THE MIDDLE ROCK WALL OF THE PERMANENT SHIPLOCK AT TGP

针对三峡永久船闸勘探设计阶段己有勘探平洞的布置特点，利用船闸二闸室中隔墩中部的８平洞主洞，在船闸开挖初期布置多点位移计测孔，实现了中隔墩岩体开挖过程中近４ａ的全过程监测。根据变形观测设施观测结果，对中隔墩岩体随船闸开挖的变形过程以及岩体的变形特征进行了分析，并将观测结果与数值计算结果进行了比较。最后，对中隔墩岩体的稳定性问题进行了讨论。

The original exploratory adits were already excavated in the shiplock area of the Three Gorges Project (TGP). The 8# adit is intersected with the middle rock wall which is used as an isolation wall of the double line shiplock and utilized to be a place to set the multi-point extensometers for safety monitoring of the middle rock wall during the shiplock excavation. The deformation measurements of four years are obtained. Analysis is made on the deformation stages and deformation properties of the middle rock wall. The deformation results obtained by actual measurements and numerical modeling are compared and analyzed. The rock stability of the middle rock wall after the shiplock excavation is discussed at last.