[热点讨论]膨胀土工程特性如何通过微观分析解释？ [复制链接]

膨胀土工程特性如何通过微观分析解释？

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膨胀土(expansive soil) 亦称“胀缩性土”。浸水后体积剧烈膨胀，失水后体积显著收缩的黏性土。由于土中含有较多的蒙脱石、伊利石等黏土矿物，故亲水性很强。当天然含水率较高时，浸水后的膨胀量与膨胀力均较小，而失水后的收缩量与收缩力则很大；天然孔隙比愈大时，膨胀量与膨胀力愈小，收缩量与收缩力则大些。这类土对建筑物会造成严重危害，但在天然状态下强度一般较高，压缩性低，易被误认为是较好的地基。中国云南、贵州、四川、广西、河北、河南、湖北、陕西、安徽和江苏等地，均有不同范围的分布。对膨胀土地基，应做好地表的防渗与排水措施，也可适当加大基础荷载与基础深度以及提高建筑物的刚度并设沉降缝；或将持力层范围内的膨胀土挖除，用砂或其他非膨胀土回填。