A Method of Determining the Characteristic Value of Bearing Capacity of Rammed/Compacted Filling Layer

Abstract

The invention provides a method for determining the characteristic value of the bearing capacity of a rammed / compacted fill layer. The method for determining the eigenvalues ​​of the bearing capacity of the rammed / compacted soil layer is based on the determination of the eigenvalues ​​of the bearing capacity of the foundation after the treatment of the foundation with dynamic ramming (compacting) with rock backfills of different particle sizes, specifically the application The characteristic value of the bearing capacity estimated by the shear strength index (c, Φ) of the direct shear test on site, and the particle analysis of the drill hole sampling and the ultra-heavy-duty dynamic penetration test in the drill hole (N 120 ) hammering number to establish the corresponding relationship between the characteristic value of the bearing capacity and the super-heavy dynamic detection value. Through this established corresponding relationship, the characteristic value of the bearing capacity of the rammed / compacted foundation soil layer can be determined accurately and quickly. In the geotechnical engineering survey work, the value and evaluation of rammed and compacted foundations provide a more accurate basis for the value of the characteristic value of bearing capacity.

Description

technical field [0001] The invention relates to the technical field of geotechnical engineering investigation, in particular to a method for determining the characteristics of the bearing capacity of a compacted filling layer by using an in-situ test method. [0002] technical background [0003] Most of the raw material yards of domestic metallurgical steel plants are located on the riverside or seaside, and most of the foundations of project construction stockpiles have undergone dynamic compaction foundation treatment, and have been compacted by graded surcharge during use. Due to the requirements of environmental protection upgrading and intelligent transformation, some of the original A-type material strips need to be transformed into closed C-type material strips. The physical and mechanical indicators of the foundation dynamic ramming fill layer, especially the shear strength indicators, need to be accurately measured. According to the current "Code for Geotechnical En...

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Problems solved by technology

Due to the requirements of environmental protection upgrading and intelligent transformation, some of the original A-type material strips need to be transformed into closed C-type material strips. The physical and mechanical indicators of the foundation dynamic ramming fill layer, especially the shear strength indicators, need to be accurately measured. According to the current "Code for Geotechnical Engineering Investigation" (GB50021-2001), the investigation of the filling layer is mainly in-situ testing, including on-site load test, on-site direct shear test and dynamic penetration test. In the process of tamping and filling construction, the rock slag from the mountain will not be sorted. Some of the tamping materials are boulders and some are cohesive soil. Different tamping materials have great differences in physical and mechanical indicators. In addition, due to The rammed fill has been compacted by open-air grading and surcharge of mineral materials, and the characteristic value of the bearing capacity is relatively high. In addition to the effect of the stockpile, the surface of the rammed compacted layer is hardened. When a large-area load test is used, due to the limited load, the The depth is difficult to reach the bottom of the rammed fill layer and below. How to use scientific means to accurately determine the characteristic value of bearing capacity, deformation modulus and shear strength index of rammed / compacted fill requires technological innovation

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