發(fā)布時(shí)間：2018-01-09 21:55

  本文關(guān)鍵詞：南票礦區(qū)松散層土體結(jié)構(gòu)性參數(shù)試驗(yàn)研究　出處：《巖土力學(xué)》2017年06期 　論文類型：期刊論文

  更多相關(guān)文章： 綜合結(jié)構(gòu)勢(shì) 應(yīng)力比結(jié)構(gòu)性參數(shù) 松散層土體 廣義剪應(yīng)變 開(kāi)采沉陷

【摘要】：為了研究采空區(qū)影響下地表建(構(gòu))筑物的變形與破壞,必須首先全面認(rèn)識(shí)建(構(gòu))筑物地基土的結(jié)構(gòu)力學(xué)特性。基于綜合結(jié)構(gòu)勢(shì)理論,利用TSW-40型土壤真三軸儀,以南票礦區(qū)松散層土體為研究對(duì)象,開(kāi)展一系列不同圍壓、含水率和中主應(yīng)力比條件下的真三軸試驗(yàn),揭示了真三維應(yīng)力狀態(tài)下松散層土體應(yīng)力比結(jié)構(gòu)性參數(shù)的變化規(guī)律,建立了結(jié)構(gòu)性參數(shù)數(shù)學(xué)模型。研究結(jié)果表明:原狀土的q-ε_(tái)s曲線呈現(xiàn)出應(yīng)變軟化型、理想彈塑性型和應(yīng)變硬化型3種典型的狀態(tài)。重塑土和飽和土q-ε_(tái)s曲線一般均表現(xiàn)為應(yīng)變硬化型。應(yīng)力比結(jié)構(gòu)性參數(shù)m_η隨剪應(yīng)變、含水率、固結(jié)圍壓和中主應(yīng)力比的增加而降低;剪切作用初始階段,m_η下降較快,當(dāng)ε_(tái)s達(dá)到5%左右后,m_η逐漸趨于平穩(wěn),至ε_(tái)s=15%時(shí),m_η趨近于1;結(jié)構(gòu)性參數(shù)數(shù)學(xué)模型結(jié)果表明,固結(jié)圍壓對(duì)m_η影響最大,含水率次之,中主應(yīng)力比對(duì)m_η影響最小。利用所建立的數(shù)學(xué)模型預(yù)測(cè)不同試驗(yàn)條件下松散層土體結(jié)構(gòu)性參數(shù)變化規(guī)律,模型驗(yàn)證結(jié)果與試驗(yàn)結(jié)果吻合,證明了模型的有效性,可以作為進(jìn)一步研究的理論基礎(chǔ)。
[Abstract]:In order to study the deformation and failure of the ground building under the influence of goaf, it is necessary to fully understand the structural mechanical properties of the foundation soil under the influence of goaf, based on the theory of comprehensive structural potential. A series of true triaxial tests under different confining pressure, water content and middle principal stress ratio were carried out by using TSW-40 type soil true triaxial apparatus and loose layer soil in Nanpiao mining area as the research object. The variation law of stress ratio structural parameters of loose layer soil under true three dimensional stress state is revealed, and the mathematical model of structural parameters is established. The results show that the Q- 蔚 s curve of undisturbed soil shows strain softening type. The Q- 蔚 s curves of remolded soil and saturated soil are generally of strain hardening type. The stress ratio structural parameter m畏 follows shear strain and moisture content. The consolidation confining pressure and the ratio of middle principal stress are increased and decreased. In the initial stage of shear action, m畏 decreases rapidly, and after 蔚 s reaches about 5%, it tends to be stable gradually, and approaches to 1 when 蔚 s = 15; The results of the mathematical model of structural parameters show that the consolidation confining pressure has the greatest influence on m畏, followed by the moisture content. The effect of middle principal stress ratio on m _ 畏 is minimal. Using the established mathematical model to predict the variation of structural parameters of loose layer soil under different test conditions, the results of model verification are in agreement with the experimental results. The validity of the model is proved and can be used as the theoretical basis for further research.
【作者單位】： 遼寧工程技術(shù)大學(xué)土木與交通學(xué)院;煤炭科學(xué)技術(shù)研究院有限公司安全分院;煤炭資源高效開(kāi)采與潔凈利用國(guó)家重點(diǎn)實(shí)驗(yàn)室(煤炭科學(xué)研究總院);遼寧南票煤電有限公司大窯溝煤礦;
【基金】：國(guó)家自然科學(xué)基金項(xiàng)目(No.51274111)~~
【分類號(hào)】：TU41
【正文快照】： 凈利用國(guó)家重點(diǎn)實(shí)驗(yàn)室(煤炭科學(xué)研究總院),北京100013;4.遼寧南票煤電有限公司大窯溝煤礦,遼寧葫蘆島125027)礦區(qū)建(構(gòu))筑物在采空區(qū)影響下會(huì)發(fā)生不同程度的變形與破壞,這些變形與破壞會(huì)直接影響礦業(yè)生產(chǎn)和礦區(qū)居民生活。為了研究礦區(qū)建(構(gòu))筑物在采動(dòng)影響下的破壞機(jī)制,就必須

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