本文選題：結(jié)構(gòu)性黏土 + 靜偏應(yīng)力　； 參考：《巖土力學(xué)》2017年01期

【摘要】：針對(duì)天然強(qiáng)結(jié)構(gòu)性湛江黏土,通過(guò)開(kāi)展不同靜偏應(yīng)力影響下的不排水循環(huán)加載三軸試驗(yàn),對(duì)循環(huán)荷載作用下的動(dòng)變形、動(dòng)強(qiáng)度和動(dòng)孔隙水壓力特性以及與土結(jié)構(gòu)性間的內(nèi)在聯(lián)系進(jìn)行系統(tǒng)性的試驗(yàn)研究。結(jié)果表明,結(jié)構(gòu)性黏土在循環(huán)荷載作用下的突然破壞,具有脆性破壞特征,靜偏應(yīng)力越大,土體破壞應(yīng)變?cè)叫　Ｕ拷ね恋呐R界動(dòng)應(yīng)力隨靜偏應(yīng)力呈先增大、后減小的變化規(guī)律,在靜偏應(yīng)力較小時(shí)存在峰值。分析認(rèn)為,靜偏應(yīng)力對(duì)結(jié)構(gòu)性黏土動(dòng)力特性的影響存在分界值,小于該值時(shí)靜偏應(yīng)力對(duì)土體的壓密作用提高了土體的臨界動(dòng)應(yīng)力和動(dòng)強(qiáng)度,抑制了土的變形發(fā)展;當(dāng)靜偏應(yīng)力繼續(xù)增大,則土體結(jié)構(gòu)損傷,動(dòng)荷載下的臨界動(dòng)應(yīng)力和動(dòng)強(qiáng)度均呈下降趨勢(shì)。結(jié)構(gòu)性土的動(dòng)孔隙水壓力低于一般黏土,靜偏應(yīng)力的存在導(dǎo)致孔壓在土體破壞后出現(xiàn)負(fù)增長(zhǎng),初始剪應(yīng)力使結(jié)構(gòu)性土體產(chǎn)生剪脹勢(shì)。
[Abstract]:In view of the natural strong structural Zhanjiang clay, the dynamic deformation of Zhanjiang clay under cyclic cyclic loading under cyclic loading under different static and deflection stresses is studied.The characteristics of dynamic strength, dynamic pore water pressure and the internal relationship with soil structure were studied systematically.The results show that the sudden failure of structural clay under cyclic loading has the characteristics of brittle failure, and the larger the static deflection stress, the smaller the soil failure strain.The critical dynamic stress of Zhanjiang clay increases first and then decreases with the static deflection stress, and there is a peak value when the static deflection stress is small.It is concluded that there exists a boundary value for the influence of static stress on the dynamic characteristics of structural clay. When the static deflection stress is less than this value, the compaction of static deflection stress on soil improves the critical dynamic stress and dynamic strength of soil and inhibits the development of soil deformation.When the static stress increases, the damage of soil structure, the critical dynamic stress and the dynamic strength under dynamic load will decrease.The dynamic pore water pressure of structural soil is lower than that of common clay, the existence of static deflection stress leads to negative increase of pore pressure after soil failure, and initial shear stress causes shear expansion potential of structural soil.
【作者單位】： 中國(guó)科學(xué)院武漢巖土力學(xué)研究所巖土力學(xué)與工程國(guó)家重點(diǎn)實(shí)驗(yàn)室;
【基金】：國(guó)家自然科學(xué)基金項(xiàng)目(No.51179186)~~
【分類(lèi)號(hào)】：TU442

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