In this paper,being relied on the project of strengthening the soft soil of a bridge abutment with high-pressure rotary jet grouting piles at a highway in Guangdong,with continuous8 yearsof settlement monitoringbeing carried out,the impact of factors such as pile spacing and diameter on the reinforcement effect of high-pressure rotary jet grouting piles has beenanalyzed.Analysis on site monitoring has shown that the overall settlement of the soft soil after treatment with high-pressure rotary jet grouting piles decreases over time,and the settlement generated in the first three years accounts for approximately 45～70%of the total settlement during the monitoring period.When the thickness of the soft soil layer does not change much along the longitudinal direction,choosing a conventional pile spacing can better control the settlement of the soft soil compared with using large spacing.The design of high-pressure rotary jet grouting piles in soft soil of the bridge abutment based on the concept of variable stiffness design of pile is beneficial for reducing the impact of longitudinal uneven settlement of the embankment.
Being based on Zhong-jiang Expressway Reconstruction and Expansion Project,the applicability and economic viability of deep soil treatment schemes of embankment and bridge plans have been discussed.The selection criteria for embankment and bridge plans under different road sections and fill heightshas been summed up,and the correlation curve between the length of the selected road section and the cost per square meter of the soft foundation treatment schemehas been compared.Considering on-situ construction conditions,the optimal selection of soft foundation treatment and bridge plans has been made and validated through examples.
According to the actual situation of the project,inthis paper,the finite element software has beenadoptedto analyze the slope stability,deformation and force of the support scheme of the high cutting slope,and on this basis,the optimization analysis on the pile spacinghas been carried out,the position ofeffective plastic zone has beendetermined,and it has been concluded that the change of the horizontal displacement of the pile body is a"7"shape deformation,the horizontal displacement value of the pile top is 13.5mm,and the maximum horizontal displacement value is 15.3mm.At the same time,by comparing and analyzing the two working conditions of whether to apply the anchor cable,it has beenshown that the prestressed anchor cable is not only conducive to reducing the shear force and bending moment value of the pile body,but also to the uniform distribution of the shear force value and bending moment value of the pile body.Finally,the stability of the slope under different pile spacing conditions has been analyzed,and it has beenobtained that the reasonable pile spacing is 4.5m.
Account settlement has become an important part of cost management in expressway construction projects.In response to current problems of long cycles and low efficiency in highway projects,in this article,takingHuazhan Section of Yunzhan Expressway as an example,accountsettlement has been deeply explored and analyzedfrom the perspective of construction management,corresponding management measures and practices have been pointed out,the efficiency of accountsettlement of the project has been improved,whichhas acceleratedcapitalturnover of contractors,solved the problem of long delays in accountsettlement after completion of the project,and couldprovide reference for similar projects.
The subgrade resilient modulus is a basic parameter of highway pavement structure design,which is usually obtained by bearing-plate method.Being based on Qing-hua Expressway Project,with Visual Studio.net as the development platform and Excel as the data warehouse,through analysis on the engineering characteristics of Qing-hua Expressway and testing principle of subgrade resilient modulus,a data collection and analysis system of highway subgrade resilient modulus has been developed.The test results of the system have shown that the programming of the test solution process of subgrade resilient modulus(bearing-plate method)can effectively overcome the shortage of manual recording and analysis that cannot detect the validity of the data in time,and help perceive the problems in the test process in time,so as to ensure that the test could be completed efficiently and accurately.At the same time,the data such as the modulus of resilience of soil foundation at different test points have beenstored in one system,which canhelp technicians to have a more comprehensive grasp of the technical status of the subgrade under construction,and canalso provide basic data for subsequent road maintenance.Engineering practice has shown that the application of information technology in road engineering can greatly reduce work intensity and error probability of technicians,thereby improving work efficiency.
