An in-situ experimental testing method of swelling pressure on expansive soils
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Chen Ronglin, Zeng Zhixing
Expansive soil has been the engineering application difficulties due to its water swelling, softening and dehydration shrinkage, cracking and other characteristics, China is one of the countries with the most extensive expansive soil distribution. In the construction of civil engineering such as railway, highway, water conservancy and construction, the problem of expansive soil is always difficult to solve. At present, many studies have been made on the indoor research of expansive soils, but there are few field experiments on the strength, deformation and mechanical properties of expansive soils. As a result, it is very necessary to measure the swelling pressure of expansive soils, because the laboratory results cannot usually reflect practical situations．Based on“loading-swelling method” and the results of loaded swelling rate tests, the swelling pressure values are obtained through linear interpolation．Finally, the field test results show that the swelling pressure can reflect the real situations, to demonstrate that the testing method can be applied in many areas．
Expansive Soils, Swelling Pressure, In-situ Experimental Test.