宁明膨胀土侧限有荷膨胀变形试验研究

EXPERIMENTAL RESEARCH ON LATERAL RESTRICTED SWELLING STRAINS OF NINGMING EXPANSIVE SOIL ON NAN-YOU EXPRESSWAY

首先分析了国内外膨胀土膨胀变形试验研究的现状,接着针对南宁-友谊关公路宁明段灰白色膨胀土,采用侧限有荷膨胀试验,在分析探讨膨胀土有荷膨胀率与上部荷载的关系以及终了含水量和上部荷载的关系、过程含水量与吸水量的关系的基础上,推导出了膨胀土在侧向约束、上部加压条件下膨胀应变与含水率、上部荷载之间的关系式,并用之对南友路膨胀土路堤的修筑提出了一些建议．

In this paper, the current status about the tests on swelling strains of expansive soils is analyzed. Formulas are derived, which can be used to calculate the linear swelling ratio between moisture content and upper load for expansive soils by adopting lateral restricted swelling experimental data for expansive soils in Ningming section of Nanning-Youyiguan road,in case of lateral confinment and upper loads, based on the relationship between upper loads and linear swelling ratio, the relationship between upper loads and end moisture content and the relationship between process moisture content and water absorption content. Some comments are put forward about embankment construction of expressway from Nanning to Youyi gate.