不同湿密状态及试验路径下膨胀土的侧向土压力及孔隙结构特征

doi:10.3724/1000-6915.jrme.2024.0835

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摘要为研究湿密状态及试验路径对膨胀土侧向土压力与孔隙结构的影响，在侧限条件下沿常体积路径（constant volume，CV）、持荷膨胀路径（swelling-under-load，SUL）和膨胀–固结路径（swell-consolidation，SC）测定具有不同初始湿密状态的宁明膨胀土试样的孔隙比–竖向荷载–侧向土压力（）关系及其孔隙结构特征。试验结果表明：（1）CV路径为SUL路径的特殊工况，SC和SUL路径所得和关系呈多段线性特征且在＞400 kPa时重合，当＜400 kPa时，2种路径下关系的斜率具有相似性；（2）膨胀土的膨胀性在高压实含水率w下显著降低，在低w下变化不显著；压实干密度对膨胀土膨胀和固结系数影响较小，但膨胀力随显著增长；（3）随着的增大，SC路径下的小孔隙以及SUL路径下的大孔隙持续减小，但SC路径下的大孔隙及SUL路径下的小孔隙仅在（为增湿前的初始孔隙比）时减小，当时则对不敏感；当时，与SUL路径相比，SC路径下的大孔隙更容易压缩，小孔隙更不易压缩；在 = 700 kPa下，当膨胀土经SUL和SC路径均发生固结时，其孔隙结构是相似的。

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	韩仲1
	吴尔勋1
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	沈细中2
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关键词 ：土力学, 膨胀土, 侧向土压力, 孔隙结构, 试验路径, 压实含水率

Abstract：To investigate the effects of initial moisture-density conditions and testing paths on the lateral earth pressure and pore structure of expansive soils during soaking, this paper measures the relationships among void ratio, lateral earth pressure, and vertical stress ( ) of Ningming expansive soil specimens compacted at five different initial moisture-dry density (w， ) conditions under the at-rest condition. The constant volume path (CV), swelling-under-load path (SUL), and swell-consolidation path (SC) were followed during the tests, and the characteristics of the pore structure were also obtained. The results show that: (1) the CV path is a specific case of the SUL path. The and relationships derived from the SC and SUL paths are multi-linear and become consistent when the vertical stress exceeds 400 kPa. Below 400 kPa, the slopes of the relationships from the SUL and SC paths are comparable; (2) the swelling potential of the expansive soil decreases nonlinearly with increasing compaction moisture content w, with a more significant reduction observed in the higher w range. The swelling and consolidation indices are not sensitive to the while the swelling stresses increase significantly with the ; (3) as the increases, the micropores of the SC path and the macropores of the SUL path continually decrease. The micropores of the SUL path and the macropores of the SC path decrease when ( is the initial void ratio before soaking). They become insensitive to when . With , comparing with the SUL path, the macropores of the SC path are easier to compress while the micropores of the SC path are harder to compress, at = 700 kPa where consolidate domains. The pore structures of the specimens with SC and SUL paths are similar.

Key words： soil mechanics expansive soil lateral earth pressure pore structure testing path compaction water content

引用本文:

韩仲1，吴尔勋1，邹维列1，沈细中2，王协群3. 不同湿密状态及试验路径下膨胀土的侧向土压力及孔隙结构特征[J]. 岩石力学与工程学报, 2025, 44(8): 2191-2201.
HAN Zhong1, WU Erxun1, ZOU Weilie1, SHEN Xizhong2, WANG Xiequn3. Lateral earth pressure and pore structure of expansive soil with different initial moisture-density conditions and testing paths. , 2025, 44(8): 2191-2201.

链接本文:

https://rockmech.whrsm.ac.cn/CN/10.3724/1000-6915.jrme.2024.0835 或 https://rockmech.whrsm.ac.cn/CN/Y2025/V44/I8/2191

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