|
As with collapsible , expansive and corrosive saline soil , combined with complex geological conditions in the western region , the climate is harsh , saline soil area roads has been regarded as a worldwide problem . Sulfate saline soil subgrade moisture field , temperature field, salinity and stress field interactions , interactions the salt expansion process is four external manifestations of the interaction . Changes in the external environment to produce the power of the salt expansion roadbed . Start from the indoor and outdoor test analysis , the variation of the moisture field , salt field , temperature field , stress field obtained by dynamic observations of the the indoor test embankment temperature field and moisture field , salt field , and the road surface deformation . By the laying temperature sensor outdoor physical works , salinity sensors and pressure cartridge roadbed within the parameters of dynamic observation , further studies the roadbed four field interaction law . Programmed with the computer itself on the basis of the previous theoretical numerical simulation of the various conditions of the test road and combined with the measured data to the theoretical formula of the previous amendments , put forward a four - field coupling correction formula , so that the revised theory formula is more in line with the saline soil engineering soil . According to the simulation of the test road , it is found the optimal barrier effect of salt on the sand and gravel materials , followed by prime soil , aeolian sand worst geotextile cut off salt migration effect , the barrier layer selection , the best .
|