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在现阶段工程运用中,卸荷岩体力学理论中还需完善和扩充的几个方面为①锚索施加前后卸荷效应对边坡水平位移的影响;②超前开挖锚固滞后的方案会对具体工程岩体水平位移产生的影响;③关键工程结构面连通率对卸荷岩体位移的影响;④地震作用下卸荷岩体的水平位移响应;⑤地震作用下不同连通率对水平向位移的影响。针对此,以大岗山坝肩边坡为对象展开研究。分析指出岩体开挖卸荷后回弹变形和压缩变形都会大于未考虑岩质劣化时的计算变形。同时指出,卸荷条件下两种施工方案对坡面的水平向位移造成的影响较小,为超挖多级而锚固措施相对滞后的现场施工过程的可行性提供依据。统计出各剖面在不同高程水平位移随地震加速度发展特征,建议水平位移随地震加速度呈非线性变化区域为防震抗震重点加固区域。研究发现,连通率的增大会导致卸荷裂隙XL9-15,XL316-1的塑性区发育明显增大,而裂隙范围内塑性区的加剧不会明显地反映在坡面关键点的变化上,开挖工况可能造成表观位移较小的突发性崩塌。
In the current stage of engineering application, several aspects to be improved and expanded in unloading rock mechanics theory are: (1) the effect of unloading effect before and after the application of anchor cable on horizontal displacement of slope; (2) The influence of horizontal displacement of concrete rock mass; (3) the influence of the connection rate of key engineering structural plane on the displacement of unloading rock; (4) the horizontal displacement response of unloading rock mass under earthquake; (5) Impact. In response to this, to Dagangshan dam shoulder slope for the study object. It is pointed out that both the springback and the compression deformation after rock excavation unloading will be greater than those without considering rock deterioration. At the same time, it is pointed out that under the unloading conditions, the two construction schemes have less influence on the horizontal displacement of the slope, which provides the basis for the feasibility of on-site construction process of over-excavation multi-level and relative lagging of anchoring measures. It is suggested that the displacement of each section varies with the acceleration of earthquake acceleration at different elevation levels. It is suggested that the nonlinear displacement of horizontal displacement with earthquake acceleration be the key earthquake-resistant and earthquake-resistant area. The results show that the increase of the connection rate will lead to the obvious increase of the plastic zone in XL9-15 and XL316-1, and the increase of the plastic zone in the zone will not obviously reflect the change of the key points of the slope Excavating conditions may cause sudden collapse with less apparent displacement.