With purpose of finding the relations between horizontal and vertical swelling pressures,the relations between swelling pressures and deforma- tions,and the changes of swelling pressures of damp-drying cycles of specimens.

With this model the performance of the direct expansion solar assisted heat pump,employing R134a as work fluid,was studied theoretically.

Direct expansion for ammonia system is discussed in this articl

The parameters include the mixing ratio of expansive agent,the expansive diameter,the distance between water injection holes and the test of the expansive stress.

The test results indicate: the beginning water content and dried density of expansive soil are the main outside factors that influence the magnitude of their expansibility and swelling quantity; according to the data of expansibility tests and swelling quantity tests, the variational rule of bot.

Relation between effective stress and swelling stress of coal body;

Experimental research on the swelling stress of limestone in the second coal mine of Tian'an,Pingdingshan city

The characteristic graph of soft rock linear swelling ratio and swelling stress and final water saturation ratio ,and related analysis results of the ratio about mud rock dry saturated absorbed water ratio and the quality contained montmorillobnite are obtained based on a large number swelling experimental results about soft rock are got.