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土壓力水平向重分布模型試驗(yàn)系統(tǒng)研究
薛麗影1,2, 孫 威1,2, 楊 斌1,2
摘 要

(1 建筑安全與環(huán)境國家重點(diǎn)實(shí)驗(yàn)室, 北京 100013; 2 國家建筑工程技術(shù)研究中心, 北京 100013)

摘要: 為了研究土壓力水平向重分布規(guī)律,研發(fā)了可精確測(cè)量活動(dòng)板位移與土壓力的活動(dòng)板試驗(yàn)裝置。 該試驗(yàn)裝置可模擬某一深度處局部支護(hù)結(jié)構(gòu)與土體的空間相互作用,并能夠?qū)崿F(xiàn)支護(hù)結(jié)構(gòu)局部變形及局部變形范圍、豎向應(yīng)力等條件的改變,在裝置中利用軸力傳感器來測(cè)量土壓力,替代了埋置土壓力盒的常規(guī)土壓力測(cè)量方法,提高了測(cè)試精度。 介紹了該試驗(yàn)裝置的構(gòu)造及試驗(yàn)原理,利用該裝置以及所提出的土壓力水平向重分布試驗(yàn)方法,對(duì)活動(dòng)板松弛位移引起的土壓力水平向重分布規(guī)律進(jìn)行了試驗(yàn)研究。 根據(jù)試驗(yàn)結(jié)果,近似認(rèn)為基坑工程中局部土體松弛變形只引起土壓力的重分布,土壓力總合力不變。

關(guān)鍵詞: 深基坑; 室內(nèi)試驗(yàn); 支護(hù)結(jié)構(gòu); 土壓力; 水平向重分布

中圖分類號(hào):TU398. 7 文獻(xiàn)標(biāo)志碼:A 文章編號(hào):1002 ̄848X(2022)06 ̄0138 ̄06

DOI:10. 19701 / j.jzjg.YG1581

Study on horizontal redistribution model test system of earth pressure

XUE Liying1,2, SUN Wei1,2, YANG Bin1,2

(1 State Key Laboratory of Building Safety and Built Environment, Beijing 100013, China; 2 National EngineeringResearch Center of Building Technology, Beijing 100013, China)

Abstract: In order to study the horizontal redistribution law of earth pressure, a movable plate test device that canaccurately measure the displacement and earth pressure of the movable plate was developed. The test device can simulatethe spatial interaction between local support structure and soil at a certain depth, and can realize the change of localdeformation, local deformation range, vertical stress and other conditions of the support structure. In the device, the axialforce sensor is used to measure the earth pressure, which replaces the conventional earth pressure measurement method ofembedded earth pressure box and improves the test accuracy. The test principle and structure of the test device wereintroduced. Using the device and the horizontal redistribution test method of earth pressure proposed, the horizontalredistribution law of earth pressure caused by the relaxation displacement of movable plate was experimentally studied.According to the test data, it is approximately considered that the relaxation deformation of local soil in foundation pitengineering only causes the redistribution of earth pressure, and the total resultant force of earth pressure remainsunchanged.

Keywords:deep foundation pit; laboratory test; support structure; earth pressure; horizontal redistribution

第一作者:薛麗影,碩士,高級(jí)工程師,主要從事巖土工程方面的研究,Email:xlydjs@ 163.com。

[引用本文] 薛麗影,孫威,楊斌. 土壓力水平向重分布模型試驗(yàn)系統(tǒng)研究[ J]. 建筑結(jié)構(gòu),2022,52(6):138 ̄143,84. XUE Liying, SUN Wei, YANG Bin. Study on horizontal redistribution model test system of earth pressure[J]. BuildingStructure,2022,52(6):138 ̄143,84.

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