Method for determining bearing capacity characteristic values of tamped/compacted fill strata by using shear wave velocity

Abstract

The invention provides a method for determining bearing capacity characteristic values of tamped / compacted fill strata by using the shear wave velocity. The method for determining the bearing capacitycharacteristic values of the tamped / compacted fill strata specifically includes the steps that the fill strata of a dynamic compaction (compacted) foundation are classified by using first stone backfill materials with different particle sizes, then the bearing capacity characteristic values of the fill strata calculated by adopting shear strength indexes (c and phi) of a direct shear test on sitecorrespondingly correspond to the shear wave velocity in a borehole to establish the relationship between the bearing capacity characteristic values and the shear wave velocity, and through the established correspondence, the accurate and fast method for determining the bearing capacity characteristic values of tamped / compacted foundation soil layers is provided in addition to a load test method.An accurate basis for valuing of the bearing capacity characteristic values is provided for valuing and evaluation of a tamped foundation and a compacted foundation in geotechnical engineering investigation.

Description

technical field [0001] The invention relates to the technical field of geotechnical engineering investigation, in particular to a method for determining the bearing capacity characteristics and deformation modulus of a rammed / compacted fill layer by using shear wave velocity. [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 f...

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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 shear wave velocity 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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