## 4 Comparative Analysis of Test Results
### Comparative Analysis of the Central Yunnan Water Diversion Project
#### 4.2.1 Comparative Analysis of the Sectional Water Pressure Test and Slug Test of Borehole WDTGH-1
The calculated results based on the three slug test models are relatively close, and the ratio between the maximum and the minimum of the permeability coefficient calculated by different slug test models is about 2.5 times. Similarly, combined with the qualitative analysis results in Figure 10, the quantitative calculation results in Tables 3 and 4 also show that the rock mass permeability in the test sections WDTGH-1-1, WDTGH-4-2 and WDTGH-6-1 is low, and the qualitative and quantitative analysis results are completely consistent, which further indicates the stability, reliability and accuracy of the slug test in determining the rock mass permeability coefficient. equipment and operation of the water pressure test are complicated. It is easy to cause the borehole to collapse when encountering broken strata, such as fault zones. The applicability of this water pressure test is limited. In addition, the water pressure test and water injection test generally need a large amount of water injection when carrying out tests; therefore, it is not convenient to put into practice in some test sites where transportation is inconvenient and the water source is distant. Through comprehensive comparison, when determining the rock mass permeability coefficient in large-scale water diversion projects and long-distance deep buried tunnels, the slug test can meet the test requirements to the greatest extent, with a simple operation and strong applicability. 2. Three theoretical models of the slug test are used to synchronously analyze and compare the data of the slug test. Among them, the calculated results of the Kipp model are generally large, and those of the CBP model and the HWS model are relatively close. However, the principle of the CBP model can be further improved. The difference of the calculated results of the three models is about two times, and all of them can satisfy the requirements of determining the permeability of the rock mass. Meanwhile, it is verified that the Kipp model, the CBP model and the novel proposed HWS model have good applicability in the parameter calculation of the deep borehole slug test. 3. The standard curves of the Kipp model are based on the standard solution form of the oscillatory equation, and the standard curves cover the situation from overdamping to underdamping. Therefore, the Kipp model has more choices in fitting curves and the best effect of fitting curves among the three models. The CBP model has a single standard curve cluster shape and a relatively gradual curve. When the slug test is conducted in high-permeability fractured rock mass, the measured data can only basically match the standard curves with the largest gradient, where the dimensionless water storage coefficient \(\varphi\) is equal to \(10-5\). When the aquifer damping coefficient is less than 1, the fitting effect of the CBP model will be relatively poor among the three models. The fitting effect of the HWS model is between the other two models. Through the research, it can be found that the calculated results of the Kipp model are larger, and the calculated results of the HWS model are smaller, so we should pay attention to the application scope and characteristics of different models. Therefore, when selecting different slug test models for determining the permeability coefficients, the permeability coefficients should be reasonably selected in combination with the drilling core data to avoid the errors of different slug test models. 4. The novel proposed HWS model is a theoretical model of a slug test considering the influence of the finite thickness well-skin layer. In contrast, the other two models do not consider the influence of well-skin. Test holes are selected in the bedrock area with good integrity, and the disturbance around the test holes is small. Therefore, the standard curves with a well-skin factor of 1 are selected in the calculation.