Stability Analysis On Cutting High Slope In Complicated Geological Conditions

With the development of social science and technology and economy,people’s living standards have been greatly improved,the construction of infrastructure such as transportation has been developed,to a large extent.However,the construction of transport facilities especially the road construction of complicated soft rock aera face many difficulties in consequence of vast territory and complex topography.It is essential to carry out the corresponding reinforcement in excavation and filling area which impacted by road construction to ensure the safety of road construction and prevent engineering accidents or traffic accidents caused by geological adverse factors.Although the reinforcement technology for the excavation and filling area is relatively mature,the reinforcement forms of different areas have diverse requirements due to the geological,climatic and other comprehensive factors.The deformation of the structure in the excavation or fill area should be observed to ensure the stability of the reinforcement structure which is effected by road construction.The deformation observation is divided into two stages: the road construction stage and the road operation stage.The road construction stage mainly guarantees the safety of the road construction,and the road operation stage is mainly used to evaluate the stability of the supporting structure and prevent safety hazards happening during the operation of the road.In this paper,the status quo of research domestic and overseas is briefly described.Taking the Xiyan Expressway project of Zhongyuan Road in Zhengzhou City as an example,the stability of the slope support structure in the excavated section of the soft rock area is mainly studied.The deformation of the supporting structure during the construction period is analyzed synthetically by means of field measurement and finite element software(MIDAS software).The main contents of this paper are as follows:(1)The regional risk and deformation of the excavation side of the construction section are in brief analyzed on account of the geological survey report of this area.Based on the road construction design,engineering survey specification and related engineering examples,the field measurement scheme is formulated scientifically and reasonably.(2)Due to the analysis of the measured data,it is concluded that the excavation area is deformed greatly during the construction of the road slope support,and then stabilized gradually with the completion of the construction.It shows that the slope support structure has played a role in strengthening the soft rock in this area,which prevents the influence of soft rock deformation on road construction effectively and ensure the safe operation during the road operation.(3)The changing rule of the slope deformation is gotten by simulating the slope support of the region adopting the finite element software(MIDAS)in strength reduction method combined with geology and excavation institutions.The maximum position of the slope deformation locates at the foot or two-level slope junction,which is consistent with the actual results of the field.The rule can play a guiding role in the field measurement work.(4)By using the method of finite element simulation combined with field measurement,the road design and construction plan is optimized practically,the risk of construction in soft rock area is greatly reduced.Therefore,the safety of road construction is ensured.A basis was provided for the subsequent construction,design and monitoring scheme of similar projects.