防渗墙钻孔压水试验渗流参数研究
发布时间：2019-05-08 08:17
【摘要】：钻孔压水试验所得到透水率及渗透系数仅限于半无限域岩体,若条形域防渗墙钻孔压水试验仍沿用半无限域公式计算其渗流参数显然不合适。针对防渗墙几何形状和钻孔压水试验原理,在基于稳定流承压完整井的渗流场条件下,采用复变函数方法将条形域中井流问题变换到半无限域中,再代入直线补给边界稳定流承压完整井流公式求解,从而导出条形域防渗墙上钻孔压水试验渗流参数求解表达式。提出对条形域与半无限域流量比Q'/Q和渗透系数比k'/k进行分析,讨论防渗墙与钻孔几何尺寸L/r_0,r_0对其影响;当取L/r_0104.7,r_075 mm,k'=k或Q'=Q时,得出条形域流量Q'和透水率q'均大于半无限域,即Q'Q,q'q,而渗透系数k'k。根据条形域与防渗墙两侧的补给边界情况,给出防渗墙钻孔压水试验渗流流量表达式使用条件。经工程实例验证,在土体与墙体渗透系数比k_1/k_2100时按提出的计算方法与芯样室内渗透试验结果基本一致。该研究方法还可将钻孔压水试验推广到其他形状有限域渗流参数求解中。
[Abstract]:The water permeability and permeability coefficient obtained by drilling water compression test are limited to the rock mass in semi-infinite domain. It is obviously not suitable to calculate seepage parameters by using semi-infinite domain formula in drilling water pressure test of diaphragm wall in strip region. In view of the geometric shape of impervious wall and the principle of drilling pressure water test, under the condition of seepage field based on steady flow bearing pressure complete well, the problem of well flow in strip domain is transformed into semi-infinite domain by means of complex variable function method. Then the integral well flow formula of steady flow bearing pressure on the recharge boundary of straight line is solved, and the solution expression of seepage parameters in the borehole pressure water test on the cut-off wall in strip region is derived. The flow ratio Q / Q and permeability ratio k / k in strip-to-semi-infinite region are analyzed, and the influence of impervious wall and bore hole geometry size L ~ (?) _ r ~ (0) and r ~ (0) on it is discussed. When L = 0104.7, r = 075 mm,k'=k or Q / Q, the flow rate Q 'and water permeability Q' in strip domain are larger than those in semi-infinite domain, I. E., Q Q, Q Q, and the permeability coefficient k'is higher than that in the semi-infinite region, that is, Q Q, Q Q, and the permeability coefficient k'is higher than that of Q Q. According to the condition of supply boundary between strip region and both sides of impervious wall, the condition of using the expression of seepage flow rate in drilling and pressing water test of impervious wall is given. It is verified by engineering example that the calculation method is basically consistent with the indoor permeability test results of core sample when the permeability coefficient ratio of soil to wall is 1 / 2100. The method can also be extended to solve the seepage parameters in other finite regions.
【作者单位】： 南京大学地球科学与工程学院;安徽水利水电职业技术学院;
【分类号】：O357.3
本文编号：2471748
[Abstract]:The water permeability and permeability coefficient obtained by drilling water compression test are limited to the rock mass in semi-infinite domain. It is obviously not suitable to calculate seepage parameters by using semi-infinite domain formula in drilling water pressure test of diaphragm wall in strip region. In view of the geometric shape of impervious wall and the principle of drilling pressure water test, under the condition of seepage field based on steady flow bearing pressure complete well, the problem of well flow in strip domain is transformed into semi-infinite domain by means of complex variable function method. Then the integral well flow formula of steady flow bearing pressure on the recharge boundary of straight line is solved, and the solution expression of seepage parameters in the borehole pressure water test on the cut-off wall in strip region is derived. The flow ratio Q / Q and permeability ratio k / k in strip-to-semi-infinite region are analyzed, and the influence of impervious wall and bore hole geometry size L ~ (?) _ r ~ (0) and r ~ (0) on it is discussed. When L = 0104.7, r = 075 mm,k'=k or Q / Q, the flow rate Q 'and water permeability Q' in strip domain are larger than those in semi-infinite domain, I. E., Q Q, Q Q, and the permeability coefficient k'is higher than that in the semi-infinite region, that is, Q Q, Q Q, and the permeability coefficient k'is higher than that of Q Q. According to the condition of supply boundary between strip region and both sides of impervious wall, the condition of using the expression of seepage flow rate in drilling and pressing water test of impervious wall is given. It is verified by engineering example that the calculation method is basically consistent with the indoor permeability test results of core sample when the permeability coefficient ratio of soil to wall is 1 / 2100. The method can also be extended to solve the seepage parameters in other finite regions.
【作者单位】： 南京大学地球科学与工程学院;安徽水利水电职业技术学院;
【分类号】：O357.3
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