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首页> 外文期刊>International journal of geotechnical engineering >Swell-shrink-consolidation behavior of compacted expansive clays
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Swell-shrink-consolidation behavior of compacted expansive clays

机译：压实膨胀黏土的胀缩收缩行为

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The main objective of this study was to develop a clear understanding of the volume change properties of compacted expansive clays. An expansive clay (G_s=2·74 and material finer than 0·002 mm=60%) with a significant water adsorption capacity (W_1=77% and _p=27%) was used. The maximum dry density was found to be 1 -45 g cm""3 at the optimum water content of 26% which is close to w_p. The soil water characteristics curve exhibited two air entry values for all of the index properties: a lower value (10 kPa for gravimetric water content (w), volumetric water content (0), and degree of saturation (S)) corresponding to drainage through inter-aggregate pores followed by a higher value (100 kPa for w and 6 but 6000 kPa for S) associated with seepage through the soil matrix. The shrinkage path during progressive drying of the investigated expansive clay exhibited an S-shaped curve with three distinct portions: an initial low structural shrinkage (S=100% to S=85%) followed by a sharp decline during normal shrinkage (S=85% to S=75%) and then by a low decrease during residual shrinkage (S=75% to S=0). The swelling potential and swelling pressure curves were also S-shaped with the following swelling stages: slow initial swelling because of the low unsaturated hydraulic conductivity; rapid primary swelling due to an established wetting front; and low secondary swelling owing to near saturation conditions. The swelling potential measured 10% and the corrected swelling pressure was found to be 290 kPa. Likewise, the compression index and the swell index were found to be 0·17 and 0·09, respectively. The predicted heave for a 1 m thick clay was found to range between 70 mm and 90 mm.
机译：这项研究的主要目的是对压实膨胀粘土的体积变化特性有一个清晰的认识。使用具有显着吸水能力（W_1 = 77％和_p = 27％）的膨胀粘土（G_s = 2·74，材料小于0·002 mm = 60％）。发现在26％的最佳水含量下接近w_p的最大干密度为1-45g cm -3。对于所有指标特性，土壤水分特性曲线均显示两个进气值：较低的值（重量水含量（w）为10 kPa，体积水含量（0）和饱和度（S））对应于通过排水骨料间的孔隙率较高（w和6为100 kPa，S为6000 kPa），这与通过土壤基质的渗漏有关。在进行研究的膨胀黏土的逐步干燥过程中，其收缩路径呈现出S型曲线，该曲线具有三个不同的部分：最初的低结构收缩率（S = 100％至S = 85％），然后在正常收缩率中急剧下降（S = 85） ％至S ＝ 75％），然后在残余收缩期间低降低（S ＝ 75％至S ＝ 0）。在以下溶胀阶段，溶胀势和溶胀压力曲线也呈S形：由于较低的不饱和水力传导率，缓慢的初始溶胀；由于已建立的润湿锋线，导致快速的主要肿胀；以及由于接近饱和条件而导致的二次膨胀低。测得的溶胀电位为10％，校正的溶胀压力为290kPa。同样，发现压缩指数和膨胀指数分别为0·17和0·09。发现1 m厚粘土的预计起伏范围在70毫米至90毫米之间。

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