12 results about "Uplift pressure" patented technology

The invention discloses a segmented quantitative analysis method for uplift pressure of a gravity dam. The uplift pressure of the gravity dam is influenced by various factors, and safety monitoring data of the gravity dam often have the problems of multiple collinearity and small samples. The method comprises the following steps: introducing a BFAST time sequence decomposition method, decomposing original uplift pressure monitoring data into a trend component and a seasonal component, and obtaining trend segment points and seasonal segment points; a Bayesian model average modeling method integrating Bayesian model selection is introduced, and a gravity dam uplift pressure statistical model is established in a segmented mode; and finally, upstream and downstream water pressure components of the uplift pressure are separated according to the average multiple models, and quantitative analysis of the uplift pressure of the gravity dam is achieved. According to the method, more accurate fitting and component separation effects can be obtained, and accurate quantitative analysis of the uplift pressure of the gravity dam can be realized.

The invention discloses a riverbed type plant dam section anti-sliding stability safety coefficient prediction method, which comprises the following steps of: acquiring actually-measured deformation data of a plurality of monitoring points of a riverbed type plant dam section in a time interval, and eliminating an aging component in the actually-measured deformation data as a monitoring value; substituting the time-varying parameter inversion target function to obtain the time-varying parameter of the dam section rock mass in the time interval through inversion; in the time interval, finite elements are adopted to calculate the anti-sliding stability safety coefficients of the dam section under multiple groups of different upstream water levels, downstream water levels and uplift pressure reduction coefficients; repeating all the previous steps in a plurality of continuous time intervals, and then training the SVR model by adopting the upstream water level, the downstream water level, the uplift pressure reduction coefficient, the time-varying parameter and the anti-sliding stability safety coefficient of all groups to obtain a prediction model; and obtaining the upstream water level, the downstream water level, the uplift pressure reduction coefficient and the time-varying parameter of the river bed type plant dam section at the monitoring moment, and inputting the prediction model to obtain the anti-sliding stability safety coefficient at the monitoring moment.

The application discloses a kind of semi-covering layer semi-bedrock foundation gravity dam foundation seepage prevention water stop design method, belong to the field of hydraulic engineering design.This application method is aimed at the complex conditions of semi-covering layer semi-bedrock foundation, adopts zoning combination seepage prevention scheme: bedrock region sets seepage prevention curtain, covering layer region sets seepage prevention wall;Comprehensive construction period structure dead weight, running period structure dead weight, water pressure, uplift pressure and other loads, design seepage prevention wall top and dam foundation embedded joint and dam bottom local structure, reserve deformation and with two purple copper water stop to realize water stop by asphalt mortar joint filling;Finally, the rationality of scheme is verified by three-dimensional finite element seepage deformation numerical calculation.This application breaks through the limitation of traditional design, provides quantitative design method, and has strong operability, provides technical support and reference for similar projects.

A three-dimensional anti-seepage structure under the sandy loam geological condition is of a three-dimensional closed structure formed by vertical anti-seepage walls, a horizontal anti-seepage layer and a drainage protection system in a cooperative mode, the drainage protection system is arranged in an anti-seepage space, the vertical anti-seepage walls are continuously arranged in the circumferential direction of the anti-seepage space, the vertical anti-seepage walls are stirring pile walls, and the horizontal anti-seepage layer is arranged on the horizontal anti-seepage layer. The horizontal anti-seepage layer is laid at the bottom of the anti-seepage space, a strong permeable stratum is arranged below the horizontal anti-seepage layer, the horizontal anti-seepage layer comprises a composite geomembrane, the composite geomembrane covers the upper portion of the strong permeable stratum in the anti-seepage space, and the drainage protection system comprises a soft longitudinal water collecting concealed pipe and a transverse communicating pipe which are arranged below the composite geomembrane. In conclusion, the anti-seepage device has the advantages that the anti-seepage efficiency is high, the capacity of adapting to differential settlement of a sandy loam foundation is high, pressure is effectively guided, drained and released, the underground water uplift pressure uplift damage risk is reduced, and the stability is high.

The invention provides a canal lining joint structure based on multi-parameter optimization, and relates to the field of canal protection. The canal lining joint structure based on multi-parameter optimization is arranged between adjacent concrete precast slabs, and comprises a joint width, a joint width, a joint width, a joint width, a joint width, a joint width, a joint width, a joint width, a joint width and a joint width, the joint width ranges from 1.8 cm to 2.2 cm; the joint material is used for filling the joint and is made of emulsified asphalt mortar or cement mortar with the compressive strength not lower than 20 MPa; the contact interface of the concrete precast slab and the joint material is a rough interface, and the average roughness of the rough interface is 1.8-2.2 mm. Through optimization design, the ultimate bearing capacity and the shear strength of the joint structure are greatly improved, the falling risk of the lining plate under the action of uplift pressure is effectively restrained, the service life of a channel is prolonged, three key parameters including the joint width, the interface roughness and the joint material are systematically coupled and optimized for the first time, and the joint structure is optimized. The optimal matching relation among the three is found, and the limitation of single-factor research is overcome.

The application discloses a kind of artificial block revetment structures based on coral mortar, belong to coastal protection engineering technical field.The existing bottom sealing cup nut block poor water permeability, wave uplift pressure is big, leading to poor slope adaptability, and wave climbing and overtopping amount uncontrollable problem, the revetment structure provided by the application includes facing layer, which is arranged on the slope by high cup nut block and low cup nut block according to the design ratio staggered combination, the control of wave climbing and overtopping amount is realized by design ratio and height difference;High cup nut block and low cup nut block are made of coral mortar, and through hole hollow structure is provided in the bottom center area to enhance water permeability and slope adhesion.The application significantly improves the wave dissipation performance and stability of the revetment structure, and is suitable for coral island reef and other stone scarce areas of coastal protection engineering.

The present invention relates to an apparatus for naturally discharging groundwater, wherein blind drains are installed in the subsurface ground beneath respective columns of an underground structure, and drainage pipes are vertically embedded in the respective columns of the underground structure, with lower ends thereof connected to the blind drains installed in the subsurface ground and upper ends thereof exposed above the ground and connected to an integrated connection pipe. Therefore, when the level of groundwater collected in the blind drains rises and the water pressure increases, the groundwater overflows to the upper ends of the drainage pipes by the self-weight of a building acting on the bottom surface of the building to be naturally discharged to a sump pit through the integrated connection pipe.

To provide a sand-proof sheet and a method for laying a sand-proof sheet that can reduce uplift pressure caused by tides and waves, and prevent damage caused by friction between the sand-proof sheet and rubble. [Solution] The sand-proof sheet 2 comprises a sand-proof sheet body 4 having a water-impermeable surface, a sheet 6 with an uplift pressure reduction function having a water-permeable uplift pressure reduction section 5 provided in the area located in the tidal zone when laid, a swing suppression member 7 superimposed on the surface of the sheet with an uplift pressure reduction function 6, and a water-impermeable covering sheet 8 covering the uplift pressure reduction section 5.

The invention discloses a double-layer drainage system of a large stilling pool, and belongs to the technical field of water conservancy projects. The system comprises an upper-layer water collecting pipe network and a lower-layer water collecting pipe network which are arranged in a stilling pool apron parting seam. The upper-layer water collecting pipe network adopts soft permeable pipes with smaller diameters, is positioned in the middle of the apron and is used for collecting seepage water at the top of the apron; the lower-layer water collecting pipe network is composed of a concrete drainage ditch and embedded soft permeable pipes with large diameters, is located at the bottom of the apron and is used for collecting deep seepage caused by uplift pressure. The water flow of the two layers of pipe networks finally converges into the drainage gallery through the seamless steel pipe and is discharged by the water pump after being guided to the water-collecting well. Based on the design thought of distributed water collection, partitioned water catchment and multi-point drainage, the uplift pressure of the apron of the stilling pool is effectively reduced, the anti-floating stability of the apron bottom plate during flood discharge is remarkably improved, and the structure has the advantages of being high in drainage capacity, stable in operation and convenient to construct.

The utility model relates to the technical field of reservoir spillway apron, especially to a reservoir spillway anti-abrasion impact energy dissipation apron, including apron bottom plate, loose foundation and apron bedrock, the top of apron bottom plate and along four edges all are fixed with the anchor bar of same interval, the inside of apron bottom plate is embedded with multiple groups of longitudinal transverse cross distribution expansion joint part, the inside of expansion joint part is filled with filler layer, the inside of apron bottom plate and loose foundation is jointly embedded with multiple groups of evenly distributed drain pipe, the top of drain pipe outside is provided with the connecting flange, in the utility model, multiple groups of anchor bar that go into apron bedrock are arranged on apron bottom plate to enhance the bottom plate anti-lifting capacity, and longitudinal transverse distribution expansion joint part is arranged on apron bottom plate, and the filler layer filled with asphalt mortar can adapt to temperature deformation and ground subsidence, and drainage hole is arranged on apron bottom plate to guide seepage discharge to reduce the uplift pressure generated by seepage.

The invention discloses a deep permeable interlayer dam foundation anti-seepage structure and a construction method. The anti-seepage structure is arranged along the axis of a dam foundation and comprises an in-situ cementing anti-seepage wall with the bottom embedded into a rock bottom plate, filling columns evenly distributed on the wall, glands covering the tops of the columns and combined with a dam body, and a curtain arranged at the bottom of the wall and continuously arranged in rock. During construction, a drill hole is drilled firstly, construction of the in-situ cementing diaphragm wall and the filling column is completed synchronously, and a gland is formed through backfilling; and then a grouting pipe is pre-buried for segmented curtain grouting. According to the invention, a multilayer anti-seepage system of'surface plugging-deep cutting-bottom seepage prevention 'is constructed, a deep permeable channel can be effectively cut off, and uplift pressure and seepage flow are reduced. And by dynamically adjusting the stirring and grouting process, disturbance to upper-layer soil rock is reduced, the continuity and reliability of an anti-seepage body and the overall stability of a dam foundation are improved, and good construction controllability and economical efficiency are achieved.

The invention discloses a stone-laying gravity dam with an internal drainage system, which relates to the field of stone-laying gravity dams, and comprises a dam body, a vertical main drainage hole, an anti-seepage masonry belt, a drainage gallery and curtain grouting, according to the stone-laying gravity dam with the internal drainage system, the vertical drainage holes and the drainage galleries are arranged in the dam body, seepage water is orderly collected and drained, uplift pressure distribution can be remarkably reduced, sliding force is reduced, and the anti-sliding safety coefficient is improved; by arranging the drainage hole curtain or the drainage gallery, the seepage path is shortened, the seepage gradient is reduced, and erosion caused by too high seepage speed is avoided; water accumulation in the dam body is reduced by timely discharging seepage water of the dam body, so that the risk of damage to the masonry caused by freeze-thaw cycle and chemical erosion is reduced; the drainage system is connected with the gallery, space is provided for manual inspection, seepage flow observation and instrument monitoring, real-time monitoring of the seepage state is achieved, if local drainage holes are blocked or seepage is abnormal, cleaning or repairing can be conducted through the gallery, and the service life of the dam body is prolonged.