Collapsible loess subgrade landslide treatment method

Abstract

The invention relates to the technical field of subgrade foundation treatment, in particular to a collapsible loess subgrade landslide treatment method which is characterized in that dry gravel is hammered into a pile by double pipes; the grain sizes of the gravel are 10mm to 30mm; the deviation between a pile pipe and the center of a hole site is no more than 2cm, the inclining degree of the pile pipe is no more than 1 / 400, the deviation of an effective pile length is no more than minus 10cm, and materials fed into a pile bottom are about 0.07m<3>; then hammering and compaction are carried out, an inner pipe is pulled out, and 0.14m<3> of gravel is added into an outer pipe; the hammering and the compaction step is repeated, until the pipe is pulled out and capping is carried out; and the ratio of piling and backfilling modified materials of loess to lime to water is 70: 20: 10. The collapsible loess subgrade landslide treatment method has the beneficial effects that the gravel pile can effectively eliminate the collapsibility of the loess foundation, a pile group and soil form the composite subgrade, so that the overall stability of the subgrade can be enhanced, the load bearing capability of the subgrade is improved, and settlement and uneven settlement are reduced.

Description

technical field [0001] The invention relates to the technical field of roadbed foundation treatment, in particular to a method for treating collapsible loess roadbed landslides. Background technique [0002] The formation of the collapsible loess subgrade is due to the self-weight stress of the overlying soil, or under the joint action of the self-weight stress of the overlying soil and additional stress, the natural porosity is large, the water permeability is strong, and in the dry state, it has high strength. And less compressibility, the structure of the soil is rapidly destroyed after being soaked by water, and significant additional subsidence occurs, and its strength also decreases with the rapidly decreasing loess. The uneven subsidence of foundation caused by loess collapsibility is the main cause of accidents in loess areas. In roadbed construction, collapsible loess and soft soil roadbed are often encountered. If not handled properly, it will cause harm to future...

AI Technical Summary

Problems solved by technology

In roadbed construction, collapsible loess and soft soil roadbed are often encountered. If not handled properly, it will cause harm to future operations and endanger driving safety.