| Taking the Changzhou Shunguo Mountain Landslide as the research object,this paper analyzes and studies the disaster mechanism of Changzhou Shunguo Mountain Slope and the monitoring characteristics of various automated/information monitoring methods under rainfall conditions by using conventional engineering monitoring,bolt stress monitoring based on vibrating string sensor intelligent acquisition system,and deformation monitoring based on 3D laser scanning technology.The numerical simulation stability analysis study is carried out for this example.The main work and research results of this paper are as follows :(1)Since the landslide treatment,a large number of conventional engineering monitoring has been carried out on the slope.Through crack observation,horizontal and vertical rock mass displacement monitoring and bolt stress monitoring,the displacement and deformation of the landslide slope after treatment have been preliminarily judged.The results show that all monitoring data during the construction safety period and the operation prevention period do not exceed the early warning design control value,which meets the early warning design requirements,and the landslide is in a stable state as a whole.For the deformation monitoring of rock and soil,the fluctuation is obvious from April to September in the rainy season,and the deformation develops rapidly from October to December after the rainy season.We should strengthen the monitoring of this stage and do a good job in early warning monitoring.(2)The intelligent acquisition system of the vibrating wire sensor(anchor stress)has been successfully applied in the slope of Shunguo Mountain,and the automatic and continuous monitoring of anchor stress has been realized.The successful development and application of We Chat applet and Web-side information platform can effectively collect bolt stress data,and synchronously upload data in real time to make the deployment of monitoring information results simpler and more convenient to view.Through modular management of data,business push is also easier and more convenient.The alarm threshold setting and alarm push are convenient,and users can control the on-site monitoring work when and where.The results show that the system has the advantages of low price and good compatibility compared with the automation equipment on the market.Compared with traditional monitoring methods,it has the advantages of strong monitoring continuity,low cost,and automation / informatization.The monitoring data of automatic bolt show that the monitoring data in the rainy season from April to September fluctuate greatly and develop rapidly.The monitoring and early warning work should be strengthened in this stage.(3)The three-dimensional laser scanning technology is used to monitor the long-distance high and steep slopes,and the surface displacement of the slope is obtained to make a slope point cloud data map to judge the stability of the slope,and compare with the deformation data measured by the total station to achieve complementarity with the traditional monitoring method.Through point cloud data analysis,it provides big data support for landslide analysis,hazard assessment(landslide deformation measurement and hazard analysis)and landslide early warning.The successful application of this technology in the slope deformation monitoring of Shunguo Mountain in Changzhou further demonstrates the feasibility of three-dimensional laser scanning technology.It is not only suitable for slope monitoring during operation and prevention,but also for slope monitoring during construction safety.In the future,it can be widely used in geological disaster warning and engineering construction projects.The results show that based on the analysis of the landslide deformation map of the vertical and horizontal displacement changes under the splicing of the point cloud data,the overall slope deformation of the Shunguo Mountain slope during the rainy season does not exceed ± 1.5 mm,and the slope is in a stable state.(4)Based on the numerical simulation,the stability of Shunguo Mountain slope under rainfall environment is analyzed.The slope stability under heavy rainfall environment,actual continuous rainfall environment and slope rainstorm environment after treatment is analyzed in detail.Taking the 8-8 profile slope as an example,the numerical simulation results of slope stability analysis show that :(1)The heavy rainfall environment will significantly increase the pore water pressure of rock and soil and reduce the safety factor of slope stability;with the increase of rainfall,the shear strength of weak interlayer(silty mudstone)decreases more obviously,and the possibility of slope landslide is greater.(2)The actual continuous rainfall environment of 100 mm in Shunguo Mountain area has little effect on slope stability.(3)The safety factor of the slope stability of the sliding surface 1 and the sliding surface 2 of the8-8 section increased by 0.464 and 0.293,reaching 1.469 and 1.203,respectively.The slope is in a stable state,which further proves the feasibility and effectiveness of the slope treatment methods such as cutting slope,hanging net and adding anchor rod. |
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