南票矿区松散层土体结构性参数试验研究

发布时间：2018-01-09 21:55

本文关键词：南票矿区松散层土体结构性参数试验研究　出处：《岩土力学》2017年06期 　论文类型：期刊论文

【摘要】：为了研究采空区影响下地表建(构)筑物的变形与破坏,必须首先全面认识建(构)筑物地基土的结构力学特性。基于综合结构势理论,利用TSW-40型土壤真三轴仪,以南票矿区松散层土体为研究对象,开展一系列不同围压、含水率和中主应力比条件下的真三轴试验,揭示了真三维应力状态下松散层土体应力比结构性参数的变化规律,建立了结构性参数数学模型。研究结果表明:原状土的q-ε_s曲线呈现出应变软化型、理想弹塑性型和应变硬化型3种典型的状态。重塑土和饱和土q-ε_s曲线一般均表现为应变硬化型。应力比结构性参数m_η随剪应变、含水率、固结围压和中主应力比的增加而降低;剪切作用初始阶段,m_η下降较快,当ε_s达到5%左右后,m_η逐渐趋于平稳,至ε_s=15%时,m_η趋近于1;结构性参数数学模型结果表明,固结围压对m_η影响最大,含水率次之,中主应力比对m_η影响最小。利用所建立的数学模型预测不同试验条件下松散层土体结构性参数变化规律,模型验证结果与试验结果吻合,证明了模型的有效性,可以作为进一步研究的理论基础。
[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.
【作者单位】：辽宁工程技术大学土木与交通学院;煤炭科学技术研究院有限公司安全分院;煤炭资源高效开采与洁净利用国家重点实验室(煤炭科学研究总院);辽宁南票煤电有限公司大窑沟煤矿;
【基金】：国家自然科学基金项目(No.51274111)~~
【分类号】：TU41
【正文快照】： 净利用国家重点实验室(煤炭科学研究总院),北京100013;4.辽宁南票煤电有限公司大窑沟煤矿,辽宁葫芦岛125027)矿区建(构)筑物在采空区影响下会发生不同程度的变形与破坏,这些变形与破坏会直接影响矿业生产和矿区居民生活。为了研究矿区建(构)筑物在采动影响下的破坏机制,就必须

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