Study On Stability Evaluation And Treatment Engineering Of Soil Landslide In A Water Plant

The mountain on the north side of a water plant in Shiyan City has slipped and deformed under the influence of continuous rainfall.Under the current conditions,it is not only dangerous,but also has serious consequences.Therefore,it is of great practical significance to carry out landslide stability analysis and prevention engineering research.Based on the background of the landslide in the water plant,this paper comprehensively analyzes the existing data and combines the field geological survey and survey to find out the geological environment conditions and the types,distribution,scale,material composition,deformation and failure characteristics and hazard objects of the geological disasters in the control area,and analyzes the main influencing factors and genetic mechanism of the landslide.According to the data of exploration results,the deformation and failure mode of landslide body is analyzed.The physical and mechanical parameters of rock and soil are determined by indoor geotechnical test,inversion method and engineering analogy.The typical section is selected for stability analysis and calculation.The stability coefficients under natural conditions and rainstorm conditions are 1.039 and 0.875 respectively.According to the theoretical calculation results and the on-site macroscopic geological survey,the stability of the landslide is comprehensively evaluated.The overall situation is basically stable under natural conditions and unstable under rainstorm conditions,indicating that the safety reserve of the landslide is insufficient.Midas GTS NX finite element software is used to simulate the typical section.Under natural conditions,the slope stability coefficient is 1.125,the maximum horizontal displacement occurs at the foot of the slope,the displacement is 9.14 cm,and the trailing edge displacement is 1.52 ～ 4.57 cm;the maximum uplift of the leading edge slope toe is4.38 cm,and the maximum subsidence of the trailing edge is 3 cm.The total displacement is 2 ～ 9.4 cm.There is a slight deformation trend before the landslide,which is mainly reflected in the slight uplift and horizontal slip at the foot of the slope,and the small tensile cracks at the trailing edge due to the vertical subsidence,which is basically stable.Under the rainstorm condition,the slope stability coefficient is 0.912,the maximum horizontal displacement occurs at the foot of the slope,the displacement is 20.12 cm,and the trailing edge displacement is 3 ～ 8 cm;the maximum uplift of the leading edge slope toe is 12.63 cm,and the maximum subsidence of the trailing edge is 3.33 cm.The total displacement is2 ～ 22.44 cm;compared with the natural working condition,the displacement is obviously increased,the trailing edge subsidence is more obvious,the tensile crack is deepened and deepened,and it is in an unstable state.The numerical simulation results are in good agreement with the comprehensive analysis conclusions of field macro geological survey,and are basically consistent with the calculation results of limit equilibrium method.According to the site geological survey,stability analysis and evaluation conclusions,hazard objects and surrounding environmental conditions,etc.,according to the general principle of ’ technical safety,economic rationality,one-time radical cure ’,the prevention and control scheme of ’ slope shaping + retaining wall + lattice anchorage + anti-slide pile +water interception(drainage)+ ecological greening + monitoring ’ is proposed,and the prevention and control measures are carried out.Engineering layout,according to relevant technical standards,the prevention and control measures were designed.In order to verify the control effect of the prevention and control scheme,the 3-3 ’ section was further selected for numerical simulation calculation under rainstorm conditions.The results show that compared with before treatment,the maximum displacement in the horizontal direction decreases from 20.12 cm to 0.83 cm,the maximum uplift decreases from 12.63 cm to 0.55 cm,and the maximum subsidence decreases from 3.33 cm to 0.47 cm.The horizontal displacement and vertical displacement of the slope are greatly reduced,and the stability coefficient is 1.56,which meets the relevant technical standards.It shows that the anti-slide pile has played a controlling role in the deformation of the water plant landslide and achieved the expected effect.The comprehensive prevention and control measures can provide reference for other similar soil landslide geological disasters.