Numerical Study On The Optimum Design Of Anchored Soil Slope

With the rapid development of China's economy and the process of infrastructure construction,soil slopes are widely used in construction projects.At the same time,the landslide caused by slope instability is frequent.And anchor reinforcement as a common form of slope support,is widely used in slope stability reinforcement,Therefore,it is significance to study the optimization design of anchored slope.In this thesis,the stability of anchorage slopes has been studied.The influence of anchor design layout parameters on the stability of anchored slopes and the optimization design of anchored slopes are discussed.Finally,the optimization design method of anchored soil slope has been expounded with the specific engineering example.Based on the existing theoretical results,this thesis has carried on the comprehensive research on the optimal design of anchored slope,the research contents are as follows:1.The formula for calculating the stability of anchorage slope of cohesive soil and cohesive soil is deduced.The analytical expressions of anchorage angle,anchorage distance and anchorage length of anchored slope are also deduced.The influence of anchorage slope design elements on slope stability is analyzed from the aspects of numerical analysis and anchoring slope reinforcement mechanism.And the calculation method and the value of the optimal anchorage angle,the optimal anchorage distance and the optimal anchorage length in the design of the anchored slope are given,Which provides a further theoretical basis for optimal design of soil slope anchorage.2.This thesis presents a numerical study on the optimum layout of anchors to stabilize soil slopes.The effect of anchor length and layout of anchor on the anchored soil slope is investigated using the finite element method and the limit equilibrium calculation method.The results show that:(1)When the anchors length are changed,the slope safety factor increases with the length of the anchor.However,when the length of the anchors reach a certain value,the slope with anchors reinforcement safety factor does not change with the growth of the anchor.Therefore,there are an effective and an optimal anchorage design length in the design of anchored slope.(2)The anchorage angle of the bolt is changed and the safety factor of the slope increases with the increase of the anchorage angle.However,after the anchorage angle reaches a certain value,the slope safety factor decreases with the increase of the anchorage angle.So the optimal anchorage angle is present in the design of anchored slope.(3)Changing the anchorage slope anchor spacing,the slope safety factor will decrease with the increase of anchorage distance.3.Studying the optimization design of anchored slope.The cost of anchored slope engineering is taken as the optimization target and the multi-variable nonlinear optimization algorithm is used to optimize the design elements of slope anchorage design.The optimization model proposed in this thesis is used to optimize the design of an actual anchored slope.And MATLAB is used to solve the problem.The results show that the optimization model has practical significance.4.A real landslide which is located in the east of China is reinforced by anchors.The design of this anchored slope follows the principles,ideas and methods proposed in this thesis.The stability difference between the original slope and the reinforced slope is studied using Finite element method and limit equilibrium method.At the same time,the optimization design model of this thesis is used to optimize the design.