U形混凝土衬砌渠道刚性连接缺陷渗漏损失评估方法初步研究

Study on Evaluation Method for Leakage Loss of Rigid Connection Defects of U-shape Concrete Lining Canal

如何精确评估季冻区U形混凝土衬砌结构刚性连接缺陷裂隙渗漏损失是渠道防渗工程中必须要考虑的重要问题之一。基于裂隙渗流立方体定理和规范中推荐使用的经验公式对缺陷裂隙渗漏量计算,表明利用裂隙渗流公式评价渠道衬砌刚性连接缺陷裂隙渗漏损失是可行的。规范推荐公式的计算过程仅反映单位长度渠段上的平均渗漏情况,不能准确反映出混凝土衬砌渠道渗漏水位置,针对这一关键问题,提出建立坐标系,建立裂隙渗流计算函数,引入渗漏水位置的设想,并给出求解函数时边界条件及参数确定的方法。

How to accurately evaluate the leakage loss of rigid connection defect fracture in U-shaped concrete lining structure is one of the important issues that must be considered in canal seepage control project in seasonal frozen region. The leakage loss of lining rigid connection defect in a case study is calculated by using fracture seepage cube theorem and specification-recommended empirical formula respectively. The comparison of two results shows that the fracture seepage formula is feasible to evaluate the leakage loss. As the empirical formula can only calculate the average leakage loss of canal in a unit lengtb and cannot accurately reflect the leakage location of canal, it is suggested to establish coordinate system and then the fracture seepage calculation function is derived. The leakage location is considered in fracture seepage function. The methods to determine the boundary conditions and parameters for solving fracture seepage function are also proposed.