【作者】 丁宝晶；

【导师】 傅荣华；

【作者基本信息】 成都理工大学 ， 地质工程， 2009， 硕士

【摘要】 溪洛渡水电站作为高坝,对坝基岩体要求非常高,在可研阶段建基岩体选择以微风化~新鲜作为标准,设计阶段考虑工程的安全、可靠、经济、合理性,在坝基满足拱坝的稳定和变形条件下,对建基面进行了一定的优化,在建基面开挖后不同高程存在一定比例的Ⅲ2级岩体,Ⅲ2级岩体的存在对大坝的稳定和变形有多大影响以及Ⅲ2级岩体的工程地质特性将是本文研究的重点。本论文以溪洛渡水电站两岸建基岩体和Ⅲ2级岩体为研究对象,通过现场地质调查,全面系统地获取地质资料,实地开展多种测试工作,对建基面岩体质量评级、岩体质量的分布情况,建基面开挖后岩体的力学参数,建基面内部的岩体质量以及Ⅲ2级岩体的岩体质量、力学参数进行进行比较系统的研究。论文研究以大量的物理、力学试验成果和变形试验结果,辅助声波验证等多种方法和手段对两岸开挖后建基岩体质量的工程地质特性进行综合研究,以定性到定量的方法,通过裂隙间距、声波纵波速度、岩体的力学变形参数、Lc密集区综合变形模量研究对建基岩体进行表部和深部分级,并通过声波和变形模量作出立体地质图,可通过剖切得到任意方向的岩级展布图,从而区分Ⅲ2级岩体与建基面可利用的Ⅱ级特别是Ⅲ1级岩体在岩体结构、岩体质量、力学变形参数上的差别与不同,进而研究得出溪洛渡建基Ⅲ2级岩体具有块度小,但力学参数相对较高的特点,平均波速接近4000m/s,对应变形模量9.5GPa,相对于其余水电工程,在力学参数上已达到Ⅲ1级岩体指标。用数值模拟对Ⅲ2级岩体变形进行验算,结果显示在建基面下游拱端变形量偏大,因模拟中对Ⅲ2级岩体变形模量进行了折减,如取Ⅲ2级岩体变形模量上限可以达到建基岩体设计要求。通过已有工程以固结灌浆处理类似较差岩体的效果和成功经验,结合溪洛渡坝基岩体的可灌性较好以及溪洛渡对较差岩体或Ⅲ2级岩体的固结灌浆处理效果,再对Ⅲ2级岩体进行细分,从岩体力学参数上对不同区段的Ⅲ2级岩体力学特征进行区分,从力学性质上来判断Ⅲ2级岩体,并按照规范及前期研究成果对应岩级的变形模量,归为到合理的岩级中,再判定其可利用性,对于波速在3800m/s以上的Ⅲ2级岩体进行高质量的固结灌浆提出可利用的可能性。通过对溪洛渡Ⅲ2级岩体工程地质特性的研究,在保证大坝安全的前题下,对Ⅲ2级岩体提出部分可利用性,对工程的经济性及其它类似工程借鉴都具有重要意义。更多还原

【Abstract】 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 ofⅢ2 level rockmass in different elevation,how many impact ofⅢ2 level rockmass’s existence on the dam’s stability and the extent of deformation,andⅢ2 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 theⅢ2 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 rockⅢ2 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 betweenⅢ2 level rockmass and theⅡlevel rockmass on foundation surface can be used, especially the gradeⅢ1 level rockmass in the rock structure、rock mass quality、the mechanical deformation parameters with different, so we conclude the features of XiluoduⅢ2 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 rockⅢ1 level indicators. Using numerical simulation medhod to check the results ofⅢ2 level rockmass deformation to shown in the lower reaches of foundation surface arch side the deformation become bigger, because in the simulation ofⅢ2 level rockmass’deformation modulus were reduced, if access theⅢ2 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 rockⅢ2 level to deal with the effect of the consolidation grouting,Ⅲ2 level again broken down rock, rock mechanics parameters from different sections of theⅢ2 level to distinguish between the characteristics of rock mechanics, from the table to determine the mechanical properties of rockⅢ2 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 levelⅢ2 for high-quality rock mass consolidation grouting can make use of the possibility raised.Through the study on theⅢ2 level rockmass’s engineering geological characteristics of Xiluodu, ensuring the safety of the dam, propose the part ofⅢ2 level rockmass can be used, it has import significance to the difficulty of the engineering and economic.更多还原