| Xiluodu Hydroelectric Power Station as a high dam is demand high Strictly of dam foundation, in the research stage to choose foundation rock of slightly weathering ~ fresh as a standard, in the design phase, consider to the project's safety,reliability,economy and reasonable, to achieve the arch dam's stability and deformation conditions, do a certain degree of optimization of the foundation surface, after the excavation of foundation surface there existence a certain proportion ofâ…¢2 level rockmass in different elevation,how many impact ofâ…¢2 level rockmass's existence on the dam's stability and the extent of deformation,andâ…¢2 level rockmass's engineering geological characteristics will be the focus of this paper.In this paper, the two sides foundation rockmass in Xiluodu hydropower station and theâ…¢2 level rockmass are the study object, through on-site geological survey, a comprehensive and systematic access to geological data, a variety of field tests on the base surface of the rock mass quality rating, rock mass quality the distribution of base surface after excavation of the mechanical parameters of rock mass, the internal base surface of the rock mass quality and rockâ…¢2 level of the rock mass quality, the mechanical parameters to compare systems.Research papers through on-site geological survey to obtain geological data comprehensive and systematic, carry out variety of scene tests, using variety of ways and means to comprehensive study on foundation rockmass's engineering geological characteristics on the two sides after excavation, from qualitative to quantitative methods,through study on the crack spacing,longitudinal wave speed of sound,the mechanics of rock deformation parameters and Lc-intensive area deformation modulus to classification the foundation rock, in order to distinguish betweenâ…¢2 level rockmass and theâ…¡level rockmass on foundation surface can be used, especially the gradeâ…¢1 level rockmass in the rock structure,rock mass quality,the mechanical deformation parameters with different, so we conclude the features of Xiluoduâ…¢2 level foundation rockmass with a small degree, but the mechanical parameters of the is relatively highly, with an average velocity close to 4000m/s, corresponding to the deformation modulus of 9.5GPa, compared the rest of hydropower projects in the mechanical parameters have reached rockâ…¢1 level indicators. Using numerical simulation medhod to check the results ofâ…¢2 level rockmass deformation to shown in the lower reaches of foundation surface arch side the deformation become bigger, because in the simulation ofâ…¢2 level rockmass'deformation modulus were reduced, if access theâ…¢2 level rockmass'deformation modulus ceiling it can be achieved foundation rockmass design requirements. According to the exist project have been dealing with this kind of consolidation grouting in rock mass effect poor and successful experiences, combined with Xiluodu dam foundation grouting of rock can be better and less Xiluodu on rock or rockâ…¢2 level to deal with the effect of the consolidation grouting,â…¢2 level again broken down rock, rock mechanics parameters from different sections of theâ…¢2 level to distinguish between the characteristics of rock mechanics, from the table to determine the mechanical properties of rockâ…¢2 level, and in accordance with the norms and the corresponding pre-rock-level research modulus of deformation, into the rock to a reasonable level, and then to determine their availability for the wave velocity in the 3800m / s and above levelâ…¢2 for high-quality rock mass consolidation grouting can make use of the possibility raised.Through the study on theâ…¢2 level rockmass's engineering geological characteristics of Xiluodu, ensuring the safety of the dam, propose the part ofâ…¢2 level rockmass can be used, it has import significance to the difficulty of the engineering and economic. |
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