Combined with the cement concrete pavement engineering, this paper analyzes the reasons of the pavement slab bottom producing pumping area, researches for the adjustment methods for this pumping area, and presents the pressure mortar material selection, the pressure mortar procedures, and the control requirement and examination methods of the pressure mortar quality for the similar works having the instruction meanings.

By orthogonal design method,the water-cement ratio,epoxy resin content,water home epexy curing agent content of polymer grouting material and influence of interaction of factors on flexural strength of the grouting material were studied for cracking in or pumping area below cement concrete pavement of expressway. An ideal and optimized formula was found out that reduced repeated test.

The pavements constructed in early years are mainly Portland cement concrete pavements, in recent years, with the increase of traffic load and running speed, pumping area beneath the slabs increases which lead slabs crack or fault, many pavements are faced with reconstruction.

For a typical cylindrical chamber (with length L, diameter D and bottom equal to pumping area with stricking coeffient β), a program is compiled to solve the integral equation by computer.

In practice, shutting down pumping, area and counting methods have been proven as valid and they are also available for reference in both annular logging and pumping logging.

According to test observation data of static load piles, Mortar Grouting and Reinforcement of Pumping Area technique proves to be effective to improve bearing capacity of composite foundation.

An integral equation is deduced which applied to the stricking-wall rate of molecules at ateady non-equilibrium state in molecular flow region. For a typical cylindrical chamber (with length L, diameter D and bottom equal to pumping area with stricking coeffient β), a program is compiled to solve the integral equation by computer. Some parameters e.g. L/D, β, the distributions of the stricking-wall rate of molecules are calculated with 1% error by a compackcomputer. The results show that how the state...

An integral equation is deduced which applied to the stricking-wall rate of molecules at ateady non-equilibrium state in molecular flow region. For a typical cylindrical chamber (with length L, diameter D and bottom equal to pumping area with stricking coeffient β), a program is compiled to solve the integral equation by computer. Some parameters e.g. L/D, β, the distributions of the stricking-wall rate of molecules are calculated with 1% error by a compackcomputer. The results show that how the state devaite from the equilibrium under these parameters and that the extent of the deviation from equilibrium state can be greatly reduced in a chamber when the pumping area is smaller than the bottom of the chamber.There is also evidence that there is a so-called "quasi-ideal position" on which a guage is set up, which will rarely depend on L/D, β and the gas source. This method could also used to calculate the probabilities of back-scattering, transmission and sorption in a cylindrial tube with wall sorption (open tube and tube with a screen). The results conform satisfactorily with those obtained by monte-Carlo method.

Reasonable development and utilization of water resources dealt with many factors and multi-purposes.Based on the system dynamics and optimization theory,this paper presents a basic principle for the reasonable distribution of water resources.A macro-model of water utilization of system dynamics and a macro-model of crop pro- duction structure are put forward.It has achieved a satisfactory result through practical calculation to high-lift pumping areas in Gaolan county,Gansu province.

The concept of soil reduction capacity and its potential application to remediating of Cr contaminated soil and groundwater were discussed.Three types of reduction capacity of soil,i.e.,the potential reduction capacity,available reduction capacity,and conditional reduction capacity were suggested.Three soil samples were collected from a groundwater pumping area and a Cr contaminated groundwater area in Tangshan City in north China.Soil column leaching experiments were conducted to evaluate the relations...

The concept of soil reduction capacity and its potential application to remediating of Cr contaminated soil and groundwater were discussed.Three types of reduction capacity of soil,i.e.,the potential reduction capacity,available reduction capacity,and conditional reduction capacity were suggested.Three soil samples were collected from a groundwater pumping area and a Cr contaminated groundwater area in Tangshan City in north China.Soil column leaching experiments were conducted to evaluate the relations between the carious reduction capacity for Cr(Ⅵ) of soils.Approaches to increase the available reduction capacity of the soil by adding selected reductive materials,such as cattle manure,FeS and weathered coal were investigated.Results showed that the available reduction capacity of soil was about three orders of magnitude lower than the corresponding potential reduction capacity.Adding of selected reductive materials to soil could increase the available reduction capacity of soil. Compared with FeS and weathered coal, the cattle manure proved to be a better reductive material apparently with a prolonged reduction potential.