本文關(guān)鍵詞：車輛荷載作用下雙層路基層間動應(yīng)力響應(yīng)試驗(yàn)研究　出處：《振動與沖擊》2017年05期 　論文類型：期刊論文

  更多相關(guān)文章： 雙層路基 動應(yīng)力突變 室內(nèi)模型試驗(yàn) 土層界面 路基穩(wěn)定性

【摘要】：針對層狀路基土的動力響應(yīng)與穩(wěn)定性評價問題,以某雙層路基為工程背景,利用現(xiàn)場實(shí)測數(shù)據(jù),揭示出硬、軟土層界面處存在動應(yīng)力突變現(xiàn)象,并給出了動應(yīng)力突變系數(shù);根據(jù)室內(nèi)模型試驗(yàn)數(shù)據(jù),以動應(yīng)力突變系數(shù)為試驗(yàn)指標(biāo),采用極差分析法對主要影響因素進(jìn)行了排序;借助動三軸試驗(yàn)獲得硬、軟土體的臨界動應(yīng)力,推導(dǎo)得出兩種土體的動應(yīng)力水平關(guān)聯(lián)性系數(shù),并提出一種評價路基長期穩(wěn)定性的"概率區(qū)域"方法。研究表明:路基運(yùn)營后期,硬、軟土層壓縮模量之比將取代硬殼層厚度,成為影響層間響應(yīng)的首要因素;埋置較深的下臥軟土層是控制路基穩(wěn)定性的關(guān)鍵層。
[Abstract]:In view of the dynamic response and stability evaluation of layered subgrade soil, taking a double-layer roadbed as the engineering background, using the field measured data, the phenomenon of dynamic stress mutation at the interface of hard and soft soil is revealed. The sudden change coefficient of dynamic stress is given. According to the indoor model test data, the dynamic stress abrupt change coefficient is taken as the test index, and the main influencing factors are sorted by the range analysis method. By means of dynamic triaxial test, the critical dynamic stress of hard and soft soil is obtained, and the horizontal correlation coefficient of dynamic stress of two kinds of soil is derived. A "probabilistic region" method is proposed to evaluate the long-term stability of roadbed. The results show that the ratio of compression modulus of hard and soft soil will replace the thickness of hard shell layer and become the primary factor to affect the interlayer response in the later stage of roadbed operation. The subgrade soft soil is the key layer to control the stability of roadbed.
【作者單位】： 燕山大學(xué)建筑工程與力學(xué)學(xué)院;
【基金】：國家自然科學(xué)基金資助(51308486)
【分類號】：U416.1
【正文快照】： 隨著交通運(yùn)輸量的增加,以及汽車速度和軸重的提高,車輛荷載在路基中產(chǎn)生的動力響應(yīng)問題已經(jīng)成為土木工程領(lǐng)域中的研究熱點(diǎn)[1]。目前,受車輛振動荷載的隨機(jī)性、土體性質(zhì)的復(fù)雜性等諸多因素的影響,相關(guān)研究工作尚處于不成熟的階段[2-3]。主要體現(xiàn)在以下幾個方面:(1)有關(guān)公路路基

【參考文獻(xiàn)】

相關(guān)期刊論文 前10條

1 冷伍明;劉文R，

本文編號：1433034