大小口径抽水试验数据换算方法初探

发布时间：2018-05-24 19:55

本文选题：抽水试验 + 钻孔　；参考：《中国地质大学(北京)》2017年硕士论文

【摘要】：本文针对于单孔抽水试验,分析了小口径和大口径抽水井抽水试验之间的关系,提出了大小口径抽水井抽水数据间的换算方法。目前水文地质条件调查和水文地质参数的获取的主要方法是各种类型的抽水试验,多数情况下的抽水试验应用的抽水井口径都相对较大,可以较好的避免因为抽水井本身所造成的一些误差,提高试验的精确度,但是各方面的成本和消耗也随之增加。本文以减少抽水试验消耗、提高工作效率为目的,以成本造价较低的小口径抽水试验为基础,应用Aquifer test和Origin两种软件为主要的计算拟合工具,通过分析实测的大口径和小口径抽水井的抽水数据,利用曲线拟合的手段建立两组数据之间的关系,并通过理论计算公式反推换算关系,对拟合数据进行修正,将实测和拟合数据输入到软件中进行计算,并将计算得到的水文地质参数结果进行对比分析,为实际推广应用提供了参考建议。分析结果表明:由于抽水井口径等井结构方面的差异,实测抽水数据的水文地质参数计算结果存在着很大的差异,利用拟合关系换算后得到的初始拟合数据计算得到的水文地质参数也存在着很大误差,无法直接进行应用;在忽略可能存在的误差的情况下,利用反推公式计算的修正系数修正拟合换算结果,拟合换算的水文地质参数值与实测得到的水文地质参数值的对比误差减小,精度可以达到试验要求,验证了换算方法的可行性;该拟合计算方法实现了将小口径抽水井抽水数据转换成假定的大口径抽水试验状态,减小小口径抽水井本身所造成误差,达到目前普遍应用的最恰当口径抽水试验的试验效果,为低成本且更加简便的小口径抽水井的应用提供了基础参考数据。
[Abstract]:Based on the single hole pumping test, this paper analyzes the relationship between the pumping test of small and large bore pumping wells, and puts forward the conversion method of pumping data between large and small bore pumping wells. At present, the main methods of hydrogeological condition investigation and hydrogeological parameter acquisition are various types of pumping tests. In most cases, the pumping wells used in the pumping tests are relatively large in caliber. It can avoid some errors caused by the pumping well itself and improve the accuracy of the test, but the cost and consumption of all aspects also increase. The purpose of this paper is to reduce the consumption of pumping test and improve the working efficiency. Based on the small caliber pumping test with low cost, two kinds of software, Aquifer test and Origin, are used as the main calculation and fitting tools. By analyzing the measured pumping data of large and small bore pumping wells, the relationship between the two groups of data is established by means of curve fitting. The measured and fitting data are input into the software for calculation, and the results of hydrogeological parameters are compared and analyzed, which provides a reference for practical application. The results show that there are great differences in the calculation results of hydrogeological parameters of the measured pumping data due to the differences in the structure of pumping wells such as caliber and so on. The hydrogeological parameters calculated from the initial fitting data converted by fitting relation also have great errors, which can not be directly applied. By using the modified coefficient to modify the result of fitting conversion, the contrast error between the values of hydrogeological parameters and the measured values of hydrogeological parameters can be reduced, and the precision can reach the requirements of the test. The feasibility of the conversion method is verified, and the fitting calculation method realizes the conversion of pumping data from small bore pumping wells to the assumed large diameter pumping test state, and reduces the errors caused by the small bore pumping wells themselves. The test effect of the most suitable pumping test is obtained, which provides the basic reference data for the application of low cost and more convenient small-bore pumping wells.
【学位授予单位】：中国地质大学(北京)
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：P641.73

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