岩土力学
巖土力學
암토역학
ROCK AND SOIL MECHANICS
2013年
z2期
190-194,203
,共6页
弱膨胀土%自然膨胀力%自然膨胀率%抗剪强度
弱膨脹土%自然膨脹力%自然膨脹率%抗剪彊度
약팽창토%자연팽창력%자연팽창솔%항전강도
weak expansive soil%natural expansibility%natural expansion rate%shearing strength
为了研究膨胀土自然状态下的膨胀及力学特性,对南阳弱膨胀土进行了不同增湿程度时的膨胀及力学特性试验。通过对相同初始条件下不同增湿程度膨胀土的膨胀特性试验得到,随着含水率的增大自然膨胀力和有荷自然膨胀率均是先逐渐增大后有小幅减小再逐渐稳定,无荷膨胀率的变化趋势是前期接近线性的增大后逐渐稳定。通过不同增湿程度膨胀土的抗剪强度试验,建立了黏聚力、内摩擦角与增湿含水率的线性关系曲线及关系式。对于已建工程,通过监测含水率得到膨胀土的实时膨胀特性以及抗剪强度,进而评价工程的安全运行情况。
為瞭研究膨脹土自然狀態下的膨脹及力學特性,對南暘弱膨脹土進行瞭不同增濕程度時的膨脹及力學特性試驗。通過對相同初始條件下不同增濕程度膨脹土的膨脹特性試驗得到,隨著含水率的增大自然膨脹力和有荷自然膨脹率均是先逐漸增大後有小幅減小再逐漸穩定,無荷膨脹率的變化趨勢是前期接近線性的增大後逐漸穩定。通過不同增濕程度膨脹土的抗剪彊度試驗,建立瞭黏聚力、內摩抆角與增濕含水率的線性關繫麯線及關繫式。對于已建工程,通過鑑測含水率得到膨脹土的實時膨脹特性以及抗剪彊度,進而評價工程的安全運行情況。
위료연구팽창토자연상태하적팽창급역학특성,대남양약팽창토진행료불동증습정도시적팽창급역학특성시험。통과대상동초시조건하불동증습정도팽창토적팽창특성시험득도,수착함수솔적증대자연팽창력화유하자연팽창솔균시선축점증대후유소폭감소재축점은정,무하팽창솔적변화추세시전기접근선성적증대후축점은정。통과불동증습정도팽창토적항전강도시험,건립료점취력、내마찰각여증습함수솔적선성관계곡선급관계식。대우이건공정,통과감측함수솔득도팽창토적실시팽창특성이급항전강도,진이평개공정적안전운행정황。
To study the expansibility and mechanical property of expansive soil in natural state, a series of expansion and mechanical property experiments, were carried out on Nanyang weak expansive soil with different humidifying degrees under the same initial condition. Through the experiments, the following conclusions are drawn:with the increase of humidifying moisture content, both natural expansibility and loaded natural expansion rate gradually increased at first, then slightly reduced, and finally became stable step by step. Load-free expansion rate almost increased in linear manner in earlier stage, then gradually became stable. By shearing strength experiments of expansive soil with different humidifying degrees, linear relation curve and relational expression between cohesion, internal friction angle and humidifying moisture content were developed. For completed projects, actual expansion property and shearing strength of expansive soil can be obtained by moisture content monitoring, which can be used to assess safety conditions of projects.