四川盆地某边坡膨胀土的力学特性试验研究

为了研究四川盆地某高速公路边坡膨胀土的膨胀及力学特性,对相同条件下增湿程度不同的膨胀土膨胀特性进行了试验研究。结果表明:膨胀土的自然膨胀力和荷载条件下膨胀率都随着含水率的增大而逐渐增大并最终趋于稳定;同时,对不同增湿程度膨胀土进行了剪切试验,获得了强度参数(粘聚力、内摩擦角)与含水率关系曲线。应用此方法,监测膨胀土的含水率可以获得实时膨胀特性和强度参数,可以直接应用于实际工程中。

Experimental study on mechnical characteristics of expansive soilof a slope in Sichuan Basin

In order to study the expansion and the mechanical characteristics of the expansive soil in the slope of a highway in Sichuan Basin，an experimental study is carried out on the expansive characteristics of the expansive soil with various wetting degrees under the same conditions. The result shows that the natural expansibility and the expansion rate of the expansive soil under load condition are gradually increased along with the increase of the water content，meanwhile，the shear tests are made on the expansive soils with various wetting degrees，thus the relation curves beween the strength parameters（cohesion，internal friction angle）and the water contents are obtained. In the engineering practice，the real-time expansion characteristics and the strength parameters can be obtained from the monitoring of the water content of expansive soil，which can be directly applied to the actual construction project.