Cone penetration method

Abstract

The invention discloses a cone penetration method. The method comprises the following steps: (1) measuring the cone tip resistance qci and side wall friction resistance fsi of a probe on the i-th layer of soil by using the probe when a cone penetration feeler lever penetrates the soil layers; and (2) adding a piezometric system at the top of the cone penetration feeler level, using a weighting system to measure the total penetration pressure Pi on the i-th layer of soil when the cone penetration feeler lever penetrates the soil layers. The cone penetration method can be used to obtain the total penetration pressure Pi, the cone tip resistance qci, the side wall friction resistance fsi, the friction-resistance ratio Rf which is equal to fsi / qci, cone pressure ratio Rqi which is equal to qci.A / Pi, side pressure ratio Rsi which is equal to fsi.hi.l / Pi and the like, thus more accurate analyses can be performed in the next step.

Description

technical field [0001] The invention relates to a testing method in geotechnical engineering, in particular to a static penetrating method. Background technique [0002] In the prior art, static sounding applied to in-situ testing of geotechnical engineering is divided into single-bridge static sounding method and double-bridge static sounding method according to the readable data. Among them, the single bridge static penetration method can only read the specific penetration resistance P of the soil layer s , the data is single, and it is difficult for engineers to conduct more analysis, so it has been used by fewer and fewer people. Double bridge static penetrating method can read the cone head resistance q in the soil layer s and sidewall friction f s , and calculate the friction ratio R f = f s / q c , the results can be used to divide the soil layer according to the linear characteristics of the penetration curve, combined with the drilling data, estimate the streng...

AI Technical Summary

Problems solved by technology

Among them, the single bridge static penetration method can only read the specific penetration resistance P of the soil layer s , the data is single, and it is difficult for engineers to conduct more analysis, so less and less people use it

Double bridge static penetrating method can read the cone head resistance q in the soil layer s and sidewall friction f s , and calculate the friction ratio R f =f s / q c , the results can be used to divide the soil layer according to the linear characteristics of the penetration curve, combined with the drilling data, estimate the strength, compressibility, bearing capacity of the soil, the vertical ultimate bearing capacity of a single pile, the possibility of pile sinking and determine the liquefaction. Many static detection methods are used; but this method can only be used for preliminary estimation, especially the reading of side wall friction fs is far from the actual friction force, which makes the result inaccurate; and the result obtained by this method Data is very limited and its use is very limited

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