عنوان

ارزیابی عملکرد خودترمیمی هسته و فیلتر در مواجهه با رگاب,‮‭Evaluation of core and filter self_healing function in the confrontation of piping‬

Text of Note

healing process and dispersivity process were selected and using the erosion barrier filter test, the interactions of the base soils and the filter in three modes (D15 = 0.21mm corrective filter) and (D15 design filter = 0.18mm) and (correction filter D15 = 0.15mm) were evaluated. The results showed good performance of clay with 10 bentonite and 1 lime with 10 bentonite in the face of correction filter D15 = 0.15mm. So that in both samples, the diameter reduction is noticeable and the output flow rate in the samples with 10 bentonite and 1 lime with 10 bentonite compared to the specific clay sample shows a reduction of 63 and 32 , respectively.-healing of the clay soils of the core and the positive effects of the filter on it can be verified. In the present study, samples from Gargar borrow pits in Gordian reservoir dam site with clay core and height of 40 meters from the dam base and crown length of 1420m with reservoir volume of 23 million m3 and geographical characteristics of 45.39 east longitude and 53.38 north latitude It is located 5 km north of Hadishahr prepared and transferred to the laboratory. This included clay soils with low plasticity properties of the soil (CL) based on a unified classification, and by adding different weight percentages of lime (0.25, 0.5, 1, 1.5, 2, 4 and 5) and bentonite (2.5, 5, 7.5, 10, 12.5, 15, 17.5 and 20) and the composition of lime and bentonite in the ratio of 1:5 and 1:10 a good range of clay plasticity properties of the soil, which was about 6.2< PI <30.8, was created in the samples. Various experiments were performed to determine the geotechnical indices on the samples in the form of different compounds, in the optimum moisture range, and the pinhole test was performed in 1, 8, 15 and 22 day time cycles while maintaining the conditions of compacted moisture on the samples. Also, to evaluate the swelling conditions of the samples, a consolidation test was performed by evaluating and comparing the results of all samples with 4 samples of base soils (10 bentonite, 1 lime, 10 bentonite with 1 lime and 2 lime with 10 bentonite). ) That had favorable conditions to improve the self-healing in the core of earth dams will be investigated. So that the core of the earth dam is not only stable against the piping phenomenon but also the self-healing properties in order to achieve the most desirable criteria for evaluating the core and filter in the face of the piping phenomenon is significant. In this research, the idea of minimal cracks and rapid self-filter interactions in terms of clay self-healing, which has always been considered by researchers as one of the positive properties of clay. Also, paying attention to the filter, which is the most basic part in earth dams after the main part, i.e. the core, and has the ability to control and repair possible cracks in the core, is another significant issue. The study of core-Recognition of various factors such as the presence of cracks, dispersivity of soil, permeability, lack of filter or filter inefficiency that leads to the phenomenon of piping and providing appropriate solutions to control and in some cases heal and improve these factors will create suitable conditions for high reliability and safety of earth dams. It is of special importance to study the characteristics of the earth dam core as the main part of the dam and to pay attention to the issue of self