摘要
裂隙是基岩裂隙地区地下水运动的主要通道,抽水试验中,与井壁相交的裂隙是抽水井主要的出水点,并不是传统井流公式假设的井壁均匀出水;受岩性变化的影响,含水层渗透性具有明显的非均质和各向异性特性;断电、机械故障等因素的影响,使得抽水井的流量不是井流公式中假设的常量。至今还没有一个综合考虑以上因素的井流公式,本文针对上述问题,提出汇点公式结合压水试验的解决方法。利用汇点概化不均匀的出水点,不均匀的出水量根据抽水并不同压水段压水试验确定的吸水量,按比例进行分配;公式中利用二维各向异性渗透系数刻画含水层各向异性;利用阶梯化流量处理试验中变化的流量。将该井流公式应用于实际工程中,收到了满意的效果。
Fractures control the hydraulic characteristics of fractured aquifer, forming the pathways for movement of groundwater. In such condition, fractures intersecting with wellbore are the main seepage zones, During pumping test, power-cut and mechanical problems probably influence the constant discharge. Facing these problems in bedrock fractured aquifers, especially that the variable wellbore discharge doesn＇t coincide with the conventional assumption of even discharge in porous media, sink point equation, combining packer test, is used to resolve this problem. The discharge of each sink points is determined by the proportion of each internal in the packer test. Anisotropy and inconstant discharge are both included in this equation, and acceleration simplex method is used to solve the objective function. Through a field test, the new method demonstrates to be applicable and effective in the fractured area.
出处
《工程勘察》
CSCD
北大核心
2008年第1期35-38,46,共5页
Geotechnical Investigation & Surveying
基金
国家自然基金海外青年学者合作基金(40528003)
