74results about How to "Calculations are reasonable" patented technology

The invention discloses a simulation method of a shield tunnel joint structure, which is characterized by comprising the steps of: (1) setting joint units: dispersing joint contact surfaces into a plurality of nodes, wherein the nodes are mutually connected by the joint units of simulation springs, circumferential upper joint units have a plurality of layers to respectively simulate force transmission liners, bolts and gaskets in real joints, and the types of the joint units at the same layer are the same; (2) setting the rigidity, the boundary condition and the joint initial displacement Delta1 of initial springs; (3) applying load; (4) examining a first joint unit; (5) setting the normal rigidity of the spring according to the type of the joint unit; (6) judging whether all the joint units are set, if so, starting the next step (7), and if not, examining the next joint unit and retuning to the step (5); (7) counting the real displacement delta 2 of the joints; and (8) comparing the delta1 with the delta2, if the difference between the two is in the allowed range tol, completing the account, and counting the deformation of the joints in the tunnel, and if the difference between the two is over the allowed range, counting the imposed load of the tunnel according to the delta2, and returning back to the step (3) to reapply the load. Based on the structure characteristics of theliner structure joints, the method builds the mechanical model of the liner structure joints, dynamically adjusts spring parameters in the process of counting according to the obtained node spring stress or the normal displacement, and uses joint models to count the whole ring liner structure. The method can consider the performance of the circumferential joints and the longitudinal joints of theliners, count the inner force and the deformation of the duct pieces and the joints of the liners, and more exactly show the status of deformation and force of the duct pieces.

The invention discloses a method for testing a maximum dry density of super grain size rough granule soil. The method comprises the following steps of: grouping granule grain sizes of a test sample at first; calculating representative grain sizes of a super grain size granule group and a non-super grain size granule group according to a mass weighing averaging method; determining a ratio of a volume of a gap between the super grain size granule and the non-super grain size granule to a volume of a super grain size granule entity, namely a super grain size granule porosity ratio, according to an established planar analysis model stacked by spheres having two grain sizes and an introduced space correction coefficient; according to a gross volume density of the super grain size granule, the mass percentage of the super grain size granule and the maximum dry density of the test sample free of the super grain size granule, the maximum dry density of the super grain size rough granule soil can be obtained. The method is definite in theory and easy in operation; the tested maximum dry density is more accurate; and more reliable data basis can be provided for engineering construction.