Combined with the project examples,it introduces the construction methods of basic mass concrete,gets the calculation to the temperature of mass concrete,foundation restraint coefficient,shrink,maximum stress and the anti-crack coefficient,and puts forward the steps of assuring the not crack of concrete,this will assure the project quality of mass concrete.

It has found out these members dangerous position with the maximum stress and calculated the stress value, made the goal and the range of daily check more definite and concentric, provided the theory basis for establishing reasonable particle check system.

The stress accumulating region and the maximum stress is calculated through cosmosm statics analysis program.

The solutions considering pre-loads of maximal stresses and their positions are obtained in the cases of different initial values or amplitudes of shock excitations on the upper or the base rigid retainer, and strength of springs is analysed at last.

Analysis on maximal stresses and strength of a long cylindrical shell with multi-openings;

The multi-point fracturing of oil well vertical to the orientation of the maximum principal stress can improve development effectiveness of the ultra-low permeab.

The soil cutting experiment indicates that the interior friction angle and the shear intensity of soil is reduced;and the maximum principal stress is decreased due to the vibration load;it induces the decrease of digging resistance.

Because there was dissension in the maximum principal stress orientation obtained by in-situ stress measurements by different results measurements,the principal stress axis was determined by conjugate joints,fault occurrence,rake angle and shift symbol of fault slip.

To achieve easily and rapidly the key data of the yield shear stress and ultimate shear stress,the double-hole micro-shear,transistors and microchip machine MSP430F149 are used in the testing system.