7 results about "Critical length" patented technology

The application provides a wharf rock-embedded pile critical pile length calculation method and system, relates to the critical pile length calculation technical field, through the deep integration and data calibration of numerical simulation and physical test, a high-fidelity comprehensive parameter database is constructed, and a continuous mapping relationship of the critical length-diameter ratio about the base rock strength and the inclination is established. First, numerical analysis is carried out under multiple working conditions, then physical model test is carried out under representative working conditions, the test data are used to construct a correction model to calibrate all simulation results, so that the accuracy of the end resistance ratio prediction is significantly improved. The application effectively solves the dual limitations that the pure numerical method lacks entity verification and the pure theoretical method is difficult to simulate the complex pile-rock contact behavior, through systematically diffusing the discrete test information into the comprehensive simulation data, the stress mechanism of the inclined rock-embedded pile is accurately described, and it is ensured that the mapping relationship established subsequently can truly reflect the physical law under the multi-factor coupling.

The application relates to the technical field of shield tunnel engineering, and discloses a control method for continuous damage of a shield tunnel. The damage range threshold of a current shield tunnel is determined according to the buried depth and the outer diameter of the current shield tunnel; the position of a key ring and the critical length of a reinforcing unit are determined according to a shield tunnel continuous damage control strategy based on an occurrence position; and the critical length of the reinforcing unit is arranged on both sides of the occurrence position along the extension direction of the shield tunnel at the positions of the corresponding key rings, so that the continuous damage of the shield tunnel is controlled. The critical length of the reinforcing unit is arranged at the positions of the key rings, the continuous damage of the shield tunnel is controlled, and the control effect is improved.

The application belongs to the technical field of tunnel and underground engineering disaster prevention and reduction, and specifically discloses a grading treatment method for mudflow gushing and deposit of a tunnel passing through a poor alteration zone, which comprises the following steps: collecting information and parameters of the gushing disaster site; based on the information and parameters and a preset grading standard, performing danger grading on the deposit after the mudflow gushing; according to the danger grading result, using a construction measure corresponding to the danger grade to treat the deposit; wherein for the deposit of a low danger grade, direct dredging or sandbag counterpressure treatment is used, and for the deposit of a medium or high danger grade, a critical length for cleaning the deposit is calculated, and then at least one of segmented grouting, segmented excavation, full-face grouting or a prefabricated grouting wall is used for treatment based on the critical length. The application can safely and efficiently treat the mudflow gushing deposit in the tunnel passing through the poor alteration zone.

The invention provides a method for simultaneously preparing pull-out samples of single fibers in cement matrixes with different thicknesses and application of the pull-out samples. The sample preparation mold comprises a bottom plate, a back plate, a baffle plate, a sample separation module and a thick bottom regulator which are fixedly connected through screws and mortise and tenon joint structures. The back plate and the sample separation module are composed of an upper part and a lower part; grooves for determining fiber positions are formed in the upper surfaces of the lower back plate and the bottom plate; the cement base body is placed in a groove formed by the back plate, the baffle plate and the sample separation module; the thickness of the fiber embedded in the cement matrix can be achieved by rotating the thickness adjuster to move the lower sample separation module. The invention provides a casting and stripping method of a single-fiber pull-out sample based on the mold and a testing method of the single-fiber pull-out sample, and the casting and stripping method and the testing method are applied to measuring the critical length of single-fiber pull-out. Through integrated mold design, pulling-out samples of fibers in cement-based materials with different thicknesses can be prepared at the same time, and the critical length that the fibers are pulled out of a matrix without breakage is further obtained. The method can fundamentally ensure that all contrast samples have high consistency in material composition, maintenance history and interface microstructure, so that the matrix thickness is used as a unique independent variable for accurate research, the test efficiency is remarkably improved, and the method is widely applied to the field of fiber reinforced cement-based materials.

The application discloses a kind of nanomaterial adding determination method, system and electronic equipment, it is related to composite material technical field.The present application determines the thermal conductivity component of each nanomaterial based on heat conduction performance and interface thermal conductivity, that is, the thermal index of nanomaterial is obtained, and the potential of greater nanomaterial for improving heat conduction performance can be quickly judged based on this thermal index.Moreover, the present application determines the critical length by establishing the relationship between the thermal conductivity between each nanomaterial and base material and the characteristic length of each nanomaterial, when the characteristic length of the selected nanomaterial is less than the critical length, the effective size interval of the nanomaterial is determined, that is, the size index of nanomaterial is obtained, and then it can be judged that the given nanomaterial corresponds to the best thermal conductivity improvement interval, based on the above processing, the composite material meeting the requirements can be prepared by adding nanomaterial in base material based on the effective size interval of nanomaterial and / or thermal conductivity component.

The invention provides a calculation method and system for the critical pile length of a socketed pile of a wharf, relates to the technical field of calculation of the critical pile length, constructs a high-fidelity comprehensive parameter database through depth fusion and data calibration of numerical simulation and a physical test, and establishes a continuous mapping relational expression of a critical length-diameter ratio about bedrock strength and an inclination angle according to the high-fidelity comprehensive parameter database. Firstly, multi-working-condition numerical analysis is carried out, then a representative working condition is selected to carry out a physical model test, and a correction model is constructed by using test data to calibrate all simulation results, so that the accuracy of end-to-resistance ratio prediction is remarkably improved. According to the method, the double limitations that a pure numerical method lacks entity verification and a pure theoretical method is difficult to simulate a complex pile-rock contact behavior are effectively solved, and high-precision description of the stress mechanism of the inclined socketed pile is realized by systematically diffusing discrete test information into comprehensive simulation data; and it is ensured that the subsequently established mapping relational expression can truly reflect the physical law under the multi-factor coupling effect.

The invention discloses automatic conveying equipment for sound-absorbing plates. A sliding block of the automatic conveying equipment for the sound-absorbing plates comprises an unloading head and a spring, one end of a connecting rod is connected with the sliding block, the other end of the connecting rod is movably connected with a base, the connecting rod is provided with a sliding groove with the length being the critical length, and a transmission arm is provided with a clamping block which is clamped in the sliding groove and can freely move along the sliding groove. The transmission arm can swing up and down so that the clamping block can move back and forth in the sliding groove, then the connecting rod can move left and right, and the discharging head pushes the sound-absorbing plate located at the bottommost portion to the discharging plate from the storage frame. According to the automatic conveying equipment for the sound-absorbing plates, manual discharging is replaced, the production efficiency is improved, meanwhile, the better structure is achieved, and operation is easier and more convenient.