文献类型：期刊文献

中文题名：扁铲探头贯入砂土的扰动效应试验研究

英文题名：Experimental study on the disturbance effect caused by flat dilatometer penetration into sand

作者：刘斌奇[1];刘培成[1];陈忠清[1,2];吕越[1];葛娟[1]

机构：[1]绍兴文理学院土木工程学院,浙江绍兴312000;[2]浙江省岩石力学与地质灾害重点实验室,浙江绍兴312000

年份：2021

卷号：49

期号：7

起止页码：6

中文期刊名：工程勘察

外文期刊名：Geotechnical Investigation & Surveying

收录：CSTPCD、、Scopus

基金：浙江省公益技术应用研究计划项目(No.2016C33052)。

语种：中文

中文关键词：扁铲侧胀试验;贯入过程;扰动效应;模型试验;砂土

外文关键词：flat dilatometer test(DMT);penetration process;disturbance effect;model test;sand

中文摘要：扁铲侧胀试验(DMT)是一种国内外岩土工程勘察中常用的原位测试技术,试验中探头的贯入过程可能对周围土体造成扰动,但目前关于这种扰动效应的研究尚不多。本文基于一系列探头预埋式和探头贯入式的DMT模型试验,对扁铲探头贯入砂土过程引起的土体扰动及其影响范围进行了探讨。结果表明:DMT探头的贯入过程导致测试结果中p1值增长20%左右,且探头贯入过程造成的土体扰动效应受土体应力历史的影响较小;DMT探头贯入过程对砂土的扰动以探头水平向挤压周围土体为主,扰动影响范围距探头膜片可达150170mm;扁平状的DMT探头与CPT锥形探头不同,贯入过程中探头楔形部对土体的竖向挤压作用不明显,但探头与土体的接触面同样存在剪切作用,影响范围距离探头膜片30mm左右。

外文摘要：Flat dilatometer test (DMT) is a common in-situ test technique in geotechnical engineering investigation at home and abroad.The blade penetration process of DMT may cause disturbance to the surrounding soils,but there is little research on this disturbance effect.Based on a series of DMT model tests with embedment of blade and penetration of blade respectively,the soil disturbance caused by the blade penetration into sand and its influence range were studied.The results show that the blade penetration process of DMT leads to the increase of p1value by about 20%,and the soil disturbance caused by blade penetration is less affected by soil stress history;the disturbance caused by blade penetration of DMT is mainly caused by the horizontal extrusion of soil around the blade,and the influence range of the disturbance is 150mm to 170mm away from the steel membrane of blade;compared with penetration of CPT cone probe,the soil deformation caused by penetration of flat blade is different and the wedge-shaped part of the blade has no obvious vertical compression effect on soil during penetration process,however,there is also shear effect between the blade and soil,which causes vertical disturbance within the range of30mm away from the steel membrane of blade.