多级边坡施工过程引起的影响区面积数值模拟研究

摘要

Using FLAC3D to complete a series of numerical simulation of the construction of multistage slope and combining CAD software to calculate the area of influence zone caused by construction,we found a function to fit the relationship between the area of influence zone and the prestress of cable.The study shows that the pre-stress of the support structure will not only cause a precompression zone with a certain area,but also reduce the area of the excavation zone of the next level slope;the relaxation zone caused by excavation and the pre-stress of anchor cable at the next level slope was imposed by a logarithmic function relation,and the precompression zone caused by pre-stress and the pre-stress of anchor cable at the same level slope was fit by the power function relationship.After inspection,the fit of the calculation formula is higher,and the correlation coefficient R2 is greater than or equal 0.958,and the formula can provide certain reference basis for the designers to determine the influence zone caused by the construction of multistage slope.%采用FLAC3D软件对多级边坡施工过程进行系统的数值模拟，结合CAD制图软件求出施工过程所引起的影响区面积，并用函数拟合影响区面积与锚索预加预应力值之间的关系；结果表明：多级边坡施工过程中，本级边坡支护结构在施加锚索预应力时不仅会引起本级边坡坡体产生一定面积的预压区，还会减少下一级边坡开挖引起的坡体松弛区的面积；使用对数函数对多级边坡开挖引起的松弛区面积与上一级支护结构所施加的锚索预应力的关系进行拟合；使用幂函数对支护结构施工引起的预压区面积与该级支护结构所施加的锚索预应力之间的关系进行拟合，得到多级边坡施工过程引起的影响区面积的经验计算公式。计算公式拟合度较高，相关系数R2均大于等于0．958。该公式可以为设计人员确定多级边坡施工影响区面积提供一定的参考依据。