The reliability of using the settle observed method to control the compacting of natural gravel roadbed is studied.

The performance of natural gravel is studied by analyzing the mechanism.

Thirdly, we studied the physical method which can improve the stability of silt, that is to use the local natural gravel to improve the performance of the silty soil, and study the different proportion of sand and gravel mixing, study the changes of the compression modulus and the CBR value, and determine the appropriate blending ratio.

According the project practice, the method of adopting the local natural grit as the meterials of the enlarged compaction pile by tamping is put forward, the process and the main construction points of the method is introduced, the quality requirements is emphasized.

Through the implement of compaction tests of natural grit with different natural gradation and design dense gradation,the primary factors influencing maximum dry density and optimum water content with different gradation composition are analyzed.

The application of natural sand in wet soft foundation management;

The first issue, permeability coefficient and permeability stability of natural sandy gravel material and the feasibility of using it as bedding material.