Treatment method of newly built high way railway engineering soft foundation

Abstract

This invention relates to a new highway and railway projects soft ground process method. The method squeezes soft mud opening in the face of weak foundation through the following steps :a,equipments filling stone with the largest particle diameter of not more than 60cm; b,spreads 40-70cm thick layer stone in the soft ground surface-paved; c,adopts hammer ram, use hammer ram tamping force to tamping stone layer by point tamping or separate tamping and plus tamping, tamping out 2-3m tamping pit in selected tamping spots ; d,for every tamping pit ,follows filling -- tamping.,filling -- tamping until the tamping the settlement is in less than 2-7 after consecutive 2-3 tamping, and then stops tamping. This invention squeezes the soft and mud silting open in the soft surface of 2-6 meters, achieves the purpose of squeezing mud replacement, and finally forms hard shell replacement layer of 2-6 m thickness, enhances the bearing capacity of the ground, increases the stability of the ground.

Description

technical field [0001] The invention relates to a method for treating foundations of newly built roads and railway projects, in particular to a method for treating weak foundations in newly built roads and railway projects. Background technique [0002] In the construction of highways and railways, it is required that the settlement after completion is small and the road surface smoothness is high. For hard soil foundations, there is no big problem, but for soft foundations, it is quite difficult to deal with. Weak foundations are mainly distributed in riverbeds and their valleys, hilly depressions in hilly areas, and mountain valleys in mountainous areas. The surface layer is mostly paddy fields, with high groundwater level, mainly composed of low liquid limit clay, sandwiched with thin layer of high liquid limit clay, and locally contains fragments of weathered rock. The soil layer is generally soft plastic, partially hard plastic or flow plastic, with poor engineering ge...

AI Technical Summary

Problems solved by technology

There are also methods of using cofferdam first, digging out weak foundations, replacing design materials, or building bridges to pass through, but there are problems of high cost and slow progress, and the former often causes environmental damage.