Method for correcting rod length of probe rod for ultra-deep dynamic penetration test and probe rod

Abstract

The invention provides a rod length correction method of a probe rod for an ultra-deep dynamic penetration test and the probe rod. The rod length correction method comprises the steps of material type selection, new material probe rod verification and correction of a rod length correction coefficient table. Reselecting a new material to make the probe rod, wherein the structural mechanical property of the probe rod made of the new material is not lower than that of a conventional probe rod; obtaining the relation between the rod length correction and the self mass of the probe rod according to a Dutch power formula; on the premise that the quality of the probe rod is not changed and the correction coefficient of the same rod length is adopted, the actual length of the probe rod made of the light material exceeds that of a conventional probe rod, and therefore correction of the longer probe rod is indirectly achieved. The rod length is converted according to the mass per unit length of the probe rod made of the light material, and the rod length in the appendix B table is replaced by the mass per unit length, so that a rod length correction coefficient table is obtained. According to the method, the hammer count correction coefficient table in the specification can be further corrected, so that the hammer count correction coefficient table can cover a longer probe rod, and the test depth of heavy dynamic sounding is increased on the premise of meeting the specification requirements.

Description

technical field [0001] The invention relates to the technical field of deep rock and soil surveying and testing, in particular to a method for correcting the length of a probe rod used in an ultra-deep dynamic penetrating penetration test and a probe rod. Background technique [0002] Dynamic penetration testing is a very common in-situ survey method in the field of engineering survey. It has the characteristics of simple operation, low cost and wide adaptability, and is widely used in geological survey work in various fields such as construction, transportation, and water conservancy. There are three types of dynamic penetration testing: light, heavy and super-heavy, among which heavy-duty dynamic penetration testing is the most widely used. According to the requirements of the current code ("Code for Geotechnical Engineering Survey" GB50021-2001 2009 Edition), when using heavy and super heavy-duty dynamic penetrating sounding for in-situ survey, rod length correction is re...

AI Technical Summary

Problems solved by technology

[0003] The maximum rod length in the rod length correction factor table for heavy-duty dynamic penetrating probe rods given in the current code is 20m, so there is no basis for correcting the rod length when performing heavy-duty power penetrating probe operations with a depth of more than 20m. Limit the application range of heavy-duty dynamic penetrating probes to within 20m

[0004] With the further development of national infrastructure, various large-scale projects and giant projects continue to appear, and the 20m depth limit can no longer meet the depth requirements of engineering survey work

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