龙门峡水电站岩体力学试验及参数取值

Rockmass Mechanical Tests and Parameter Values in Longmenxia Hydropower Station

龙门峡水电站现已蓄水发电,坝基及坝肩主要岩体为白云质灰岩。在预可研阶段和可研阶段对其进行了一系列原位岩体力学试验,包括岩体变形试验、岩体直接试验、岩体与混凝土接触面直剪试验,试验应力与工程实际受力状态相同。全面系统地对3组岩体变形试验、1组岩体直剪试验和1组岩体/混凝土接触面直剪试验成果进行分析研究,充分揭示了坝基工程岩体变形、抗剪等力学特性。从试点的地质代表性、岩石的破坏形态等方面分析了岩体的变形特性、抗剪特性。提出了可供设计采用的工程岩石力学参数建议值。

Longmenxia hydropower station has been impounded water and generated electricity, dolomitic limestone mainly distributed at dam foundation and abutment. During the pre-feasibility study and feasibility study stages,in-situ rockmass mechanical tests( including rockmass deformation tests,rockmass direct sheer tests,and interface between rock and concrete direct sheer tests) were conducted,whose loading paths and maximum pressure were the same as the conditions of the dam acting on the rock mass. By comprehensive analyzing 3 groups rockmass deformation test results,1 groups rock mass shear test results and 1 groups interface between concrete and rock shear test results,deformation and sheer mechanical properties of rockmass at dam base are fully revealed. Deformation and shear strength characteristics are analyzed from some aspects,such as geological representation of test points and rock failure mode. At last,rock mechanical parameters for design are proposed.