Analysis For Stability Of Side Slope And Studies Of Treatment Measures In North Yinnen Main Channel

Heilongjiang Province is located in deep seasonal permafrost zone, because affected by special climate environmental conditions, hydraulic soil texture side slope will not only suffer from warm soil’s instability destruction situations including rainfall scouring, underground water seepage and water flow scouring, etc, but also will suffer from seasonal permafrost zone’s instability destruction situations including frost heaving role, melting snow runoff erosion, ice thrust and icicles destruction, etc. Its destruction type is complex and changeable and combines common features for warm soil and frozen soil. Additionally and day and night temperature difference role over and over again enables channel engineering to commonly appear different degrees of destruction of frost heaving and thawing settlement which becomes a big difficult problem of affecting and restricting construction of channels.This article mainly aims at the problem of instability of seasonal permafrost zone to adopt Swedish slice method and Bishop method for stability analysis of typical section in north Yinnen main channel. Study frost heaving influence of onsite monitored cross section and analyze changing trend of water mark and temperature field. Aim at typical cross section to propose side slope protective measures suitable for application in seasonal permafrost zone, and select protective measures for test study of indoor model and analyze temperature field, stress field and displacement field of model test. Propose methods and protective structural measures suitable for stability analysis of seasonal permafrost zone to provide technical support and guarantee for safety and maintenance of channels water conveying of seasonal permafrost zone.We have concluded through destruction studies for typical section of north Yinnen main channel that:I. Due to complexity of natural environment, soil texture of side slope in seasonal permafrost zone appears multiple destruction types which affect channel’s normal operation.II. Analyze results of indoor geotechnical test and test of frost heaving distinguishing features for soil sample of north Yinnen main channel side slope, main factors affecting frost heaving of soil texture in seasonal permafrost zone obtained through analytic hierarchy process include percentage of moisture and soil mass’ own distinguishing features, etc, by which, we have concluded and summarized main affecting factors for instability of side slope.III. Swedish slice method and Bishop method can be applied in stability analysis for side slope of soil texture of seasonal permafrost zone. Calculation result of software is basically consistent with arc sliding deformation of onsite monitoring. We discover that instability of such side slope appears influence of seepage, namely, there are water inside high plains seep to interior of channel which is main reason causing instability of side slope.IV. Summarize distinguishing features of application for different structural forms of side slope protective measures, among which, including slope protection by gravels and polyurethane and slope protection by Renault mats, etc, analyze temperature field, stress field and displacement field for protective measures of model test and obtain structural forms suitable for stability of side slope of seasonal permafrost zone. This kind of method appraising and calculating stability for side slope of seasonal permafrost zone provides worth learning experiences for maintenance and operation in the future in seasonal permafrost zone for channel engineering and provides time-saving, labor-saving and effective reference scheme for construction of channel engineering.