Study On The Compaction Monitoring System Of Earthwork And Its Application

Effective control of filling construction quality is critical to ensure the safety of earthwork.At present,indirect nondestructive testing methods have low detection accuracy,and the compaction prediction and simulation analysis method is not timely;the existing rapid assessment methods for compaction quality are lack of research on rockfill material with larger partice size distribution(0~400mm);the existing real-time monitoring systems have these problems such as leakage,cross-over and repeated rolling between adjacent working surfaces,and can not be used in hazardous work areas or in the extreme conditions of the plateau.To develop the earthwork compaction monitoring system that can simultaneously monitor three specific control indexes(result control index,material source control index and construction parameter control index)not only has important academic significance,but also great practical application value.The research results obtained in this paper are as follows:(1)An earthwork compaction monitoring system was developed,which has the functions of simultaneous monitoring result control index,material source control index and construction parameter control index.The system has been successfully applied to Qianping reservoir construction site,realized meticulous monitoring of the main aspects of the dam filling construction process and the unmanned rolling operationand effectively ensured the construction quality.(2)A new compactness detection method based on integrated acoustic detection technology was proposed.Based on the dynamic response theory of the saturated semi-space under the concentrated force and the sound field model of infinite baffle piston,combined with on-site rolling,the relationship model between the continuous compaction index(SCV)and the filling material was established.The method can solve the problem that the existing nondestructive testing methods are not applicable to the rockfill material with a large particle size distribution(0~400mm).(3)An innovative differential pulse excitation method(DPEM)was proposed.In view of this problem that the vertical displacement is hard to solve when the normal harmonic load acts on saturated half-space surface,a DPEM method was proposed to solve the numerical solution of the vertical displacement of soil surface under the action of simple harmonic load in the process of establishing A-model.(4)A compaction quality assessment model based on SCV index was established,and a corresponding fast assessment method was proposed.Based on a strong linear correlation between SCV and dry density,and combined with multi-site rolling test,three compaction regression models for rockfill material were established(model?,model?,model ?).In combination with geostatistical method,assessment method can be used to quickly assess the compaction quality of the fill material during rolling work.(5)A solution to real-time monitoring system of rolling construction parameters based on automatic driving technology was proposed,which included the automatic rolling system and material source transportation real-time monitoring system.The system can effectively solve the problems of leakage,cross-over and repeated rolling between adjacent working surfaces,ensure that rolling operations can perform normally under dangerous environment or extreme conditions and provide the fast and efficient transportation support for the filling construction.