Foundation treatment method of collapsible loess slope cut-and-fill joint part

Abstract

The invention discloses a foundation treatment method of a collapsible loess slope cut-and-fill joint part. The cut-and-fill joint part of a constructed slope is subjected to foundation treatment by M cut-and-fill layers from top to bottom, and a cut-and-fill layer at the bottom of the M cut-and-fill layers is a bottom cut-and-fill layer. The foundation treatment method of the collapsible loess slope cut-and-fill joint part includes a bottom cut-and-fill layer foundation treatment step, a last cut-and-fill layer foundation treatment step and a once or twice repeating step. The bottom cut-and-fill layer foundation treatment step includes excavating a cut step, treating a soft cut foundation and a fill foundation, building a fill area soil body and constructing the cut-and-fill joint part, wherein the construction process of the cut-and-fill joint part includes mounting a geogrid and constructing a rigid connection framework. The once or twice repeating step includes repeating the former two steps until the foundation treatment process of the M cut-and-fill layers is completed. The foundation treatment method is simple in steps, convenient to implement, good in foundation treatment effect and capable of solving the problem that joint effect of cutting and filling of the existing collapsible loess slope cut-and-fill joint part is poor and differential settlement of the cut-and-fill joint part is easy to cause and the like.

Description

technical field [0001] The invention relates to a foundation treatment method, in particular to a foundation treatment method for a collapsible loess slope filling and excavation junction. Background technique [0002] Since April 2012, Yan'an, Shaanxi Province has invested hundreds of billions of dollars to "cut mountains, fill ditches, build land, and build cities" in an unconventional way. It took 10 years to sort out 78.5 square kilometers and build them in the gully area around Yan'an city A new city twice the size of the current urban area. The Yan'an "Cutting Mountains to Build a City" project is currently the largest geotechnical project in Asia and even the world in the collapsible loess area, and it is also the first case in the history of city construction in the world. Collapsible loess refers to the loess that undergoes significant additional deformation due to the structural damage of the soil after soaking under the action of the self-weight stress of the ove...

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is to provide a foundation treatment method for the filling and excavation junction of collapsible loess slopes in view of the above-mentioned deficiencies in the prior art. Existing collapsible loess slopes have problems such as poor combination effect between excavation and filling, and uneven settlement at the junction of filling and excavation.

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