Experimental Study On The Rubble Pressed Method In Reinforcing Shallow Soft Ground In Sichuan Basin

In the construction process of highway in Sichuan basin, we often encounter large area of shallow soft soil needed to be addressed. And in general, the construction unit will use the replacement method to treat the ground. But if we only use this method, it will cause a mass of spoil and need a large area of spoil ground. The Liangzhong Expressway in Chongqing is along with large area of shallow soft soil. The depth of the soft soil is one to two meters and most are paddy fields. If we use the replacement method, it will occupy a lot of farmlands, and it is thus neither cheap nor environmental. The Liangzhong Expressway crossing Mingyue mountain and Nanhua mountain, and the blasting construction of the tunnels will cause a large number of stones. If we can use the stones which are from the blasting construction of the tunnels and the cutting slope excavation to treat the soft ground, we can eliminate the spoil caused by the replacing method. The method is not only benefit to protect the ecological environment, but also can save the investment of the project, shorten the construction period, produce good economic benefit.This article first ues sheet rock fills method to study the size of the filler. Design the model of tests, through three sets of model packing size 6cm、9cm、 12cm conducted three sets of pressure filling simulation test to verify the feasibility of filling pressure rubbles law, obtained better treatment models packing size 9cm and 12cm, corresponding to the actual size of the filler 45cm and 60cm.In the test section along the Liangzhong Expressway, we tested the the rubble pressed method. Controling the construction process and considering the compaction quality impact of the paving thickness、compactive energy、times of grind, this paper studies the pertinence between the indoor test and the field test. After treating the soft ground, installing the subsidence-pipe、the inclinometer tube deflection inclinometer、the earth pressure cell piezometer and filling the embankment. And we monitored the subgrade during the filling to study the effect of the the rubble pressed method and verify its reliability.Analysising the field test and organizing findings, this paper presents reinforcement method and construction technology for the rubble pressed method.