Method for Estimating Ultimate Lateral Resistance of Pile Foundation Soil Using Retaining Wall Casing

Abstract

The invention discloses a method for estimating the limit side resistance of pile foundation soil by using a protective wall casing, and relates to the technical field of geotechnical engineering exploration and testing. It includes the following steps: Step 1: Use the drilling rig to lift the casing and place it in the drill hole and fix it, and then lift the penetrating hammer; Step 2: Measure the distance between the penetrating hammer and the top surface of the casing cap head, and the distance between the casing cap head and the ground and the length of the casing that has entered the soil layer; Step 3: The penetrating hammer hammers the casing with an automatic drop hammer; Step 4: Repeat the above steps 2‑3 to hammer the casing to the predetermined depth; Step 5: Get the standard value of the limit side resistance of the soil. The method provided by the invention takes into consideration the utilization of the casing drilling process, does not increase the process or equipment, is simple, and saves test time and test costs.

Description

technical field [0001] The invention relates to the technical field of geotechnical engineering exploration and testing, more specifically, it relates to a method for estimating the ultimate lateral resistance of pile foundation soil by using a retaining wall casing. Background technique [0002] In pile foundation geotechnical engineering investigation, the following three methods are usually used to determine the vertical bearing capacity of a single pile: [0003] 1) Single pile static load test; [0004] 2) In-situ test method: through the establishment of the relationship between static penetration testing, dynamic penetration testing, etc., and the vertical bearing capacity of single piles measured by static load tests, empirical formulas are obtained; [0005] 3) Empirical parameter method: According to the empirical relationship between the physical index of the soil and the bearing capacity parameters, the side resistance and the end resistance are determined, so t...

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Problems solved by technology

[0007] Both the in-situ test method and the empirical parameter method belong to the empirical method. In areas lacking experience and when the static load test conditions are not available in the survey stage, the limit side resistance and limit end resistance proposed in the survey report to estimate the bearing capacity of the pile foundation are insufficient. in accordance with

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