Research on the Integrity of Super-long Perfusion Piles Detected by Reflection Wave Method

被引：0

作者：

Chang, Juyou ^{[1
]}

Ren, Guanggui ^{[1
]}

Chang, Chao ^{[1
]}

Gao, Jinghong ^{[1
]}

Yin, Quanyong ^{[1
]}

Zhang, Xingyao ^{[1
]}

机构：

[1] China Railway Eryuan Engineering Group Co. Ltd, Chengdu,Sichuan,610031, China

来源：

Journal of Railway Engineering Society | 2020年 / 37卷 / 08期

关键词：

Compressive strength - Concrete testing - Soils - Railroads - Railroad transportation - Load testing - Infill drilling - Soil testing;

D O I：

暂无

中图分类号：

学科分类号：

摘要：

Research purposes: The passenger tunnel foundation of a high-speed railway station in soft soil area adopts the reverse circulation method and positive loops to construct perfusion piles. The pile length is 60~62 m, the pile diameter is 1. 0 m. C40 concrete perfusion pile belongs to super-long cast-in-place pile; Some of the non-acoustic tube pile integrity testing use the reflection wave method. According to reflection method of Technical Specification for Testing of Railway Piles TB 10218-2008: The pile length is generally not more than 40 m, and when the pile length is greater than 40 m, the standard of pile length can be determined based on field test data. So the integrality of super-long cast-in-place pile detection by reflected wave method is studied. Research conclusions:(1) Infusion piles is constructed by reverse circulation and positive loops in soft soil areas, and pile end is in the state of expansion. (2) Firstly, the acoustic wave method and the reflective wave ratio test were selected, both of which were class I qualified piles. The curve of the reflective wave pile was reversed, and the measured speed is 4 280 to 4 320 m/s. (3) A small number of non-acoustic tube piles are selected to detect the reflection wave with the same characteristics as before, and the core of the drill core is measured by the core sample with a complete length of more than 0.5 m, the speed is 4 280 to 4 320 m/s, which is consistent with the former. The compressive strength of the core sample is up to C45 concrete, and the static load test of the single pile meets the design requirements. (4) It is feasible to detect the integrity of super long perfusion piles in soft soil area by comparing the reflection wave method, and this reflection wave characteristic parameter can guide the subsequent integrity test of uninstalled acoustic tube pile. (5) The research results can provide reference for the study of the integrity of super-long perfusion piles detected by reflectance wave method in soft soil areas such as railways and highways. © 2020, Editorial Department of Journal of Railway Engineering Society. All right reserved.

引用

页码：24 / 28