Fu Water Conditions, Slope Stability And Instability Prediction

The soil slope stability has been an important content of geotechnical engineering all the time, and it relates to artificial and natural fields such as mining engineering, civil engineering, railway and highway engineering, hydrological and hydroelectric engineering, harbor engineering, waste residue and garbage management engineering, hillside and riverside, etc. With the development of social economy, the construction will extend to western China and the slope hazard will become more and more serious, and so the analysis of slope stability will be more and more important.Slope stability is affected by the substance and structure qualifications of itself and the outer environmental conditions. Best of all, the qualifications of itself are elementary and the environmental conditions are active. The qualifications of itself include lithology and its combination and structural aspect. On the other hand, the outer environmental conditions mainly include ground water, rain water and ground stress, etc. In fact, the qualifications of it always exist as definite characters^ and the environmental conditions change very often and possess essential affections on slope stability. According to the former data, about 90 percent of slope failures happen under the affection of water. From this, we know the extensive and deep affection of water on slope stability. So it is very important to pay great attention to the analysis of water and its sensitivity. This is the foundation and inevitable route of stability analysis, and it is helpful to make stability analysis more and more deepening and refined and accelerates the development of slope engineering.Taking the soil slope (excluding special soil) as the analysis object, all sorts of influencing factors on slope stability are discussed in this paper. To realize the relationship between water and slope stability, the shear strength of soil mass under the affection of water, dynamic and steady hydraulic pressure, erosion and chemical action of water are studied. The soil slope stability, especially considering the crack under the affection of rainwater is discussed and a calculating formula that contains crack hydraulic pressure is got. This makes it become more reasonable than before to analyze the slope stability. Then, the forecasting methods of slope failure are introduced simply. Taking the rainfall amount as the parameter, a forecasting model is established and several rainfall boundaries are got. Later, the imagination of forecasting system of slope failure, and the prevention and cure measures are brought up. All of these possess guiding significance and reference value to the practice. At last, taking the dialing Xincun slope harnessing engineering as the example, the slope stability under the affection of rainfall and the application of drain ditch and drain hole are accounted for.