Seepage Stability Analysis Of The Expansive Soil Channel In The Middle Line Of The South-to-North Water Transfer Project

The main canal of the middle route of South to North Water Diversion Project.part of the channel via the expansive soil, expansive soil is a kind of special water swelling. shrinkage of unsaturated soil. For this reason, need to launch a series of research on expansive soil section in the project to ensure the safety and stability of the whole project. In this paper, aiming at the seepage of expansive soil canal section in the middle route of South to North Water Diversion Project are studied in the channel, ensure that won’t because of seepage failure. First of all. to understand the engineering properties of expansive soil, the expansive soil in engineering problems; Secondly, combined with the basic theory of seepage analysis and different seepage analysis methond,carryout laboratory and field tese.and the indoor experiment and field tese data analysis; Finally, combining the data analysis and the results of test application of professional seepage analysis software seep3D to analyze the seepage channels. The specific contents include:(1)Ina preliminary understanding of the special properties of expansive soil, indoor test, to further understand the test of expansive soil canal section of physical and mechanical properties. Selection of pile No. K58++487.838 canal for the expansion of Q1clay loamand silty sand lens. Clearance observed. Test canal section of main components of Q1clay freexpansion rate high.with moderate swelling potential, will have great influence on the channel seepage. Therefore, the indoor experiment focused on Q, clay.determine its physical and mechanical properties.(2) In order to make the research more in line with the actual situation, get more sufficient basis, need to select the typical expansive soil section of prototype test. Field test includes two aspects: ① Horizontal displancement monitoring on soil and undisturbed soil, determine the slope stability, seepage analysis is of practical significance to ensure follow-up:② On the soil and soil water content and pore water pressure monitoring, to provide reference data for the subsequent simulation software.(3) The seepage analysis for the test section of channel. In the process of analysis, using Seep3D software for seepage analysis of test section of channel. SeepSD software is software specifically for the analysis of seepage, the application theory more perfect, simulationpressents three-dimensional defect, more in line with the actual situation of engineering. Therefore, research on seepage is widely applied to practical engineering.In the course of using software simulation, first set the range test and analysis of channel flow and boundary conditions, determine the seepage analysis model: then determining three kinds of calculation conditions, respectively, the design water level, overhaul duration and period of rainfall condition; analysis methodof the software provided, the three cases wereseepage analysis. Through the analysis, by strict control of constructionquality. expansive soil on channel range take excavation replacement, compaction with composite geomembrane and concrete measures can ensure that the channel dose not occur seepage failure.