本文選題：膨脹應(yīng)力 + 側(cè)向壓力��； 參考：《西南交通大學(xué)》2015年碩士論文

【摘要】：膨脹土主要是由強(qiáng)親水性粘土礦物成分(如蒙脫石、伊利石和高嶺石等)組成的,具有特殊的膨脹結(jié)構(gòu),以及強(qiáng)烈的脹縮特性、多裂隙性和強(qiáng)度衰減性的高塑性粘性土。通過(guò)對(duì)成都地區(qū)膨脹土基坑調(diào)研發(fā)現(xiàn),膨脹土基坑邊坡在降雨后,由于降雨和管道滲水等作用,基坑會(huì)出現(xiàn)變形或大裂縫。膨脹力是造成基坑失穩(wěn)的主要原因,然而現(xiàn)有的膨脹土相關(guān)規(guī)范中,沒(méi)有對(duì)其分布作出明確規(guī)定,無(wú)法在支護(hù)設(shè)計(jì)計(jì)算中考慮膨脹力的作用效果,導(dǎo)致基坑支護(hù)設(shè)計(jì)無(wú)法滿足工程需求。通過(guò)對(duì)膨脹土基坑邊坡側(cè)向壓力的研究,旨在探討膨脹力對(duì)側(cè)向壓力的影響,為支護(hù)結(jié)構(gòu)設(shè)計(jì)計(jì)算提供依據(jù)。主要研究?jī)?nèi)容和結(jié)論如下：(1)結(jié)合膨脹土及膨脹應(yīng)力的相關(guān)文獻(xiàn),利用非飽和土力學(xué)及熱力學(xué)相關(guān)知識(shí),研究了膨脹應(yīng)力計(jì)算問(wèn)題,推導(dǎo)了膨脹應(yīng)力計(jì)算公式△Pπ=κlnω0/ω1。結(jié)合土中含水量隨深度變化曲線,分析半無(wú)限空間中膨脹應(yīng)力隨深度分布情況。(2)對(duì)膨脹土基坑邊坡進(jìn)行分區(qū),結(jié)合濕度場(chǎng)理論,討論膨脹土基坑邊坡中濕度場(chǎng)分布情況,并得到膨脹土基坑邊坡膨脹應(yīng)力隨深度分布,近似為不規(guī)則的梯形。(3)利用莫爾—庫(kù)倫強(qiáng)度理論和極限平衡條件,推導(dǎo)了考慮膨脹應(yīng)力作用時(shí),主動(dòng)土壓力和被動(dòng)土壓力公式,分別為(4)以龍?zhí)端履郴禹?xiàng)目為例,對(duì)膨脹應(yīng)力,側(cè)向壓力計(jì)算方法進(jìn)行示例計(jì)算。結(jié)果證明膨脹力對(duì)基坑邊坡側(cè)向壓力有非常大的影響。在進(jìn)行支護(hù)設(shè)計(jì)計(jì)算時(shí),考慮膨脹力的作用,其基坑頂部位移,基坑底部位移及計(jì)算嵌固深度均變大,因此設(shè)計(jì)時(shí)應(yīng)考慮膨脹力的影響。
[Abstract]:Expansive soil is mainly composed of strong hydrophilic clay minerals (such as montmorillonite, Illite and kaolinite). It has a special swelling structure, strong dilatancy and shrinkage, multiple fissures and strength attenuation of high plastic cohesive soil. Through the investigation of expansive soil foundation pit in Chengdu area, it is found that the slope of expansive soil foundation pit will be deformed or cracked due to rainfall and pipe seepage. The expansion force is the main cause of foundation pit instability. However, there is no clear stipulation on its distribution in the existing relevant codes of expansive soil, so it is impossible to consider the effect of expansion force in the design and calculation of support. As a result, the foundation pit support design can not meet the engineering needs. Based on the study of lateral pressure of expansive soil foundation pit slope, the influence of expansion force on lateral pressure is discussed in order to provide basis for design and calculation of supporting structure. The main contents and conclusions are as follows: (1) based on the literature on expansive soil and expansion stress, and by using the knowledge of mechanics and thermodynamics of unsaturated soil, the calculation of expansion stress is studied, and the formula P 蟺 = 魏 ln 蠅 0 / 蠅 1 is deduced. Combined with the variation curve of soil moisture content with depth, the expansion stress distribution with depth in semi-infinite space is analyzed. The slope of expansive soil foundation pit is partitioned with moisture field theory. The distribution of moisture field in expansive soil foundation pit slope is discussed. The expansion stress distribution of expansive soil foundation pit slope with depth is obtained, which is approximately irregular trapezoidal.) based on Mohr-Coulomb strength theory and limit equilibrium condition, the formulas of active earth pressure and passive earth pressure are derived when the expansion stress is taken into account. Taking a foundation pit project in Longtan Temple as an example, the calculation method of expansion stress and lateral pressure is calculated. The results show that the expansion force has a great influence on the lateral pressure of foundation pit slope. In the calculation of support design, the effect of expansion force is considered, the displacement of the top of the foundation pit, the displacement of the bottom of the foundation pit and the calculation of the embedded depth are all increased, so the influence of the expansion force should be considered in the design of the foundation pit.
【學(xué)位授予單位】：西南交通大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：TU443

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