本文關(guān)鍵詞：砂土的UH模型　出處：《巖土工程學(xué)報(bào)》2016年12期 　論文類型：期刊論文

  更多相關(guān)文章： 砂土 壓硬性 剪脹性 臨界狀態(tài) UH模型

【摘要】：在UH(Unified Hardening,統(tǒng)一硬化)模型的基礎(chǔ)上,通過分析砂土特性,建立了砂土的本構(gòu)模型。該模型具有以下幾個(gè)特點(diǎn):1通過引入壓硬性參量,模型可以描述在e lnp空間內(nèi)砂土的等向壓縮線為曲線的特性;2通過引入剪脹性參數(shù),模型可以合理描述砂土的剪脹特性,即松砂的特征狀態(tài)應(yīng)力比較大,密砂的特征狀態(tài)應(yīng)力比較小的特性;3通過引入臨界狀態(tài)參數(shù)來建立砂土的水滴形屈服面,模型可以合理描述臨界狀態(tài)線(CSL)在e lnp空間內(nèi)的位置。相對(duì)于UH模型,本文所提的砂土模型只增加了3個(gè)材料參數(shù),且3個(gè)參數(shù)都可通過室內(nèi)常規(guī)試驗(yàn)確定。最后,利用該模型對(duì)砂土排水和不排水試驗(yàn)進(jìn)行預(yù)測(cè),預(yù)測(cè)結(jié)果與試驗(yàn)結(jié)果吻合很好。
[Abstract]:On the basis of UH (Unified Hardening, unified hardening) model, the constitutive model of sand is established by analyzing the characteristics of sand soil. The model has the following characteristics: 1 through the introduction of rigid pressure parameters in the e model can describe the sand in the LNP space to the compression line curve characteristics; 2 through the introduction of dilatancy parameter model can reasonably describe the dilatancy of sand, characteristics of loose sand stress state is relatively large, characteristics the state of dense sand stress is relatively small; 3 to build sand by introducing critical state parameters of the drop shaped yield surface. The model can reasonably describe the critical state line (CSL) in the e LNP space position. Compared with the UH model, the sand soil model proposed in this paper only adds 3 material parameters, and the 3 parameters can be determined through the indoor test. Finally, the model is used to predict the drainage and undrained tests of sand, and the prediction results are in good agreement with the experimental results.
【作者單位】： 北京航空航天大學(xué)交通科學(xué)與工程學(xué)院;
【基金】：國家重點(diǎn)基礎(chǔ)研究發(fā)展計(jì)劃(“973計(jì)劃”)項(xiàng)目(2014CB047001) 國家自然科學(xué)基金項(xiàng)目(51579005,11272031)
【分類號(hào)】：TU441
【正文快照】： 1975年Lade等[1]通過分析總結(jié)砂土的真三軸試驗(yàn)數(shù)據(jù),提出了砂土的彈塑性模型。Been等[2]假設(shè)砂土臨界狀態(tài)線在e lnp空間為直線的基礎(chǔ)上,提出了狀態(tài)參數(shù)來建立砂土的本構(gòu)模型。Li等[3]在邊界面模型的基礎(chǔ)上通過引入狀態(tài)參量來建立了砂土的本構(gòu)模型。Poorooshasb等[4-5]采用單，

本文編號(hào)：1345512