218 results about "Ground settlement" patented technology

The present invention belongs to the field of tunnel and underground engineering technology. In the concrete, it relates to a shield tunnel settlement control method based on ground-detecting radar. Said control method includes the following steps: adopting ground-detecting radar equipment to make sectional and longitudinal detection of slurry injection after shield tunnel wall, determining and estimating dielectric constant of slurry injection material, making model testing detection to obtain data, extracting characteristic image and characteristic wave, utilizing wavelet neural network automatic identification method to obtain slurry injection layer distribution form, combining said slurry injection layer distribution form with ground settlement monitoring data and making analysis, then defining further construction measure for implementing settlement control according to the detected and analyzed result.

The invention discloses a shield construction method which uses a shield machine to continuously under-pass dense buildings in a silty-soil and silty-sand formation. The method comprises the following steps: (1) soil improvement, (2) shield tunnel, (3) segment assembly, and (4) synchronized grout injection. The method in the invention overcomes the problem that the prior shield construction methods can not satisfy requirements for ground settlement in shield constructions of water-rich silty-soil and silty-sand formations. Through the soil improvement, the shield in the construction process can maintain tunneling with stable tunneling speeds and cutterhead torques. With construction parameters strictly controlled, single ground settlement can be controlled within 3mm while accumulative ground settlement and building settlement can be controlled within 10mm. Thus, roads over the tunnel can be ensured to be unblocked, and buildings to be safe and normally used. The shield in the construction process can maintain tunneling with stable tunnel speeds and cutterhead torques, thereby increasing working efficiency and reducing construction cost.

The invention discloses a settlement control construction method for a transverse grouting guide pipe of a shallow underground excavation tunnel. The method includes: laying an advanced small pipe and a horizontal cantilever grouting guide pipe; excavating a middle guide tunnel by a benching tunneling construction method; constructing a middle separation wall and a waterproof layer thereof; and respectively excavating a left guide tunnel, a left tunnel, a right guide tunnel and a right tunnel by the benching tunneling construction method. By the aid of the settlement control construction method, an unconsolidated stratum layer can be effectively consolidated, the soil texture of an unconsolidated stratum is improved, and ground settlement and stratum deformation caused by shallow underground tunnel excavation in the unconsolidated stratum are prevented.

The invention provides a ground settlement risk grade evaluation method based on a cloud model and a data field. According to the method, a PS point is optimized through a cloud model algorithm; then, the data field is used for carrying out automatic clustering on the settlement speed, the population density and the economic density; the obtained settlement speed classification grade, the population density lattice grade or the economic density lattice grade are overlapped; and a ground settlement risk grading chart is generated. The evaluation method adopted by the invention considers the uncertainty of ground settlement risks and the relevance among the ground settlement risks; the influence on the ground settlement by factors such as hazard factor risks, hazard-affected body vulnerability and hazard-formative environment is integrated; the evaluation method is more scientific, reliable and accurate; and a reliable basis is provided for the ground settlement risk grading.

The invention belongs to novel materials in tunnel construction, in particular to shield synchronous grouting slurry capable of effectively controlling stratum displacement caused by shield construction and tunnel floating after escaping from the shield tail. The properties of the novel shield synchronous grouting slurry material relate to the control of stratum settlement caused by shield construction, the tunnel floating after escaping from the shield tail, and the long-term stability of the tunnel. The invention aims at overcoming the shortcoming in condensation time of conventional single-fluid activity and inertia material, mainly adopts yellow sand, lime putty and fly ash, and adds proper amount of additives to prepare the high-quality synchronous grouting material with high density, high early strength, small shrinkage deformation, good fluidity, good filling property, good stability, seismic resistance and no liquefaction. By the application of the synchronous grouting slurry in engineering test, the invention effectively controls the ground settlement and the tunnel floating after escaping from the shield tail, simultaneously excellent performance and construction effect of the synchronous grouting material obtain general consent from the building side and the construction side, and the synchronous grouting slurry has practicality and promotion value.

The invention relates to a groundwater recharge system structure for foundation pit dewatering. The purpose of the invention is to provide a groundwater recharge system structure for foundation pit dewatering which is capable of reducing and retarding surrounding stratum settlement and ground settlement caused by foundation pit dewatering under the state of an enormously thick confined aquifer, and simultaneously capable of overcoming the shortcomings such as recharge well blockage and water outflowing at the outer side in the prior art, improving the recharge efficiency and also prolonging the service life of the recharge system. The groundwater recharge system structure is matched with a foundation pit depressurizing system in use, and comprises a recharge well and a recharge device, wherein the recharge well comprises a well pipe; a water stop layer, a water-resisting layer and a filter layer are orderly arranged on the outer wall of the well pipe from top to bottom, a mudjacking pipe is reserved outside the well pipe, a sedimentation pipe is arranged at the bottom of the well pipe, a two-layer wind filter is arranged at the upper part of the sedimentation pipe, and a water suction pump is arranged in the well pipe 2-6m away from the bottom of the well, and the like; the recharge device comprises a recharge pipeline, a water release pipeline, an exhaust pipeline and the like.

The invention relates to the technical field of geological condition monitoring, in particular to a ground sedimentation monitoring system which comprises a plurality of sensors, a programmed data acquisition unit and a data acquisition processing server. The sensors are arranged in a borehole extensometer and a water level well. A star topology structure consists of the sensors and the data acquisition unit, and the data acquisition processing server establishes connection with the data acquisition unit. The ground sedimentation monitoring system is characterized in that the data acquisition unit is connected with a CDMA (Code Division Multiple Access)module which is connected with a fixed IP server by a CDMA network, the fixed IP server is connected with a communication port of the data acquisition processing server by an LAN (Local Area Network), unique code corresponding to a placing area is stored in each sensor, and the data acquisition processing server is internally provided with an item table for recording and setting the code information corresponding to sensor codes. The invention has the advantages of acquiring ground sedimentation monitoring data in real time with high efficiency and overcoming the defects of long period and less data of manual monitoring.

Disclosed is a regional ground settlement monitoring method based on multiple track and long strip CTInSAR (coherent target synthetic aperture radar interferometry). The regional ground settlement monitoring method based on the multiple track and long strip CTInSAR includes seven steps: step 1, partitioning long strip radar data and performing accurate registration on the long strip radar data after being partitioned; step 2, generating a differential interference stripe atlas; step 3, removing track remnant phase positions; step 4, performing CTInSAR timing sequence analysis; step 5, examining and correcting adjacent partitioning blocks of a long strip; step 6, unifying coordinate systems of multiple tracks; step 7, examining information of the multiple tacks and unifying basis references. The regional ground settlement monitoring method based on the multiple track and long strip CTInSAR solves the two main problems that how to reduce error influences of base line error, atmospheric oscillation, phase unwrapping noise and the like, which show obvious low frequency characteristics along with range enlargement in a spatial domain during the deformation information extraction process and how to perform the accurate registration on deformation monitoring results of the adjacent tracks on space positions, which are encountered during the large region deformation survey and monitor process of InSAR (synthetic aperture radar interferometry), and unifies the basis references of deformation measurement among the different tracks.

The invention discloses a method for post grouting of a segment wall in shield tunnel construction of a full-section hard rock stratum. The method comprises the following steps of shield machine installation, grouting platform construction, synchronous grouting behind the segment wall, secondary grouting behind the segment wall, secondary grouting between hoops and grouting detection. According tothe method, the grouting process is simple in steps, synchronous grouting combined with the secondary grouting is adopted for wall back filling, the loss of synchronous grouting is reduced, the conflict between the secondary grouting and shield tunneling is lowered, the smooth progress of shield construction is ensured, the quality problems such as ground settlement, segment floating up, tunnel seepage and structure damage caused by the insufficient grouting behind the segment wall in the construction of the hard rock stratum are controlled, because the amount of double liquid slurry in the secondary grouting is decreased, thus the grouting cost is lowered, and the construction efficiency is significantly improved.

The invention relates to a blade-cut-in type soft soil multi-point displacement meter anchor head comprising a middle shaft rod, an external rod, an upper frame, a lower frame, a spring tube, a transmission rod and an anchoring cutter. The external rod sleeves the upper portion of the middle shaft rod, the bottom of the external rod is connected to the upper frame, the bottom of the middle shaft rod is connected to the lower frame, the spring tube sleeves the lower portion of the middle shaft rod, the upper end of the spring tube is connected with the upper frame, the lower end of the spring tube is connected with the lower frame, one side of the transmission rod is hinged to the upper and lower frames, the other side of the transmission rod is hinged to the anchoring cutter, the middle shaft rod is provided with a segment of spiral structure, and the inner side of the upper frame is provided with a nut structure; when the middle shaft rod rotates, the spring tube stretches to drive the lower frame to bounce upwardly so as to drive the transmission rod to extend out the anchoring cutter into the tested-segment drilling hole wall soil. Compared with the prior art, the blade-cut-in type soft soil multi-point displacement meter anchor head has the advantages that the blade-cut-in type soft soil multi-point displacement meter anchor head can be used for measuring different ground settlement in a soft soil area and providing ground settlement monitoring data for foundation pit engineering and underground engineering.

The invention relates to a ground strength tester. It mainly solves the problem that the depth layer is not tested because of the lack of filling compaction as by testing the resistance generated when penetrating bar insert into ground prior ground strength tester tests the ground strength. In the invention, the piston of oil cylinder extends down by pressing the cavity without bar in oil cylinder. Flat round contact is set at the front end of piston of oil cylinder by ball joint and the contact pushes the ground down. The displacement sensor fixed on the piston of oil cylinder moves down to measure the displacement of ground settlement. By recording the pressure and the displacement the ground strength is tested.

The invention discloses a near-G-series high-speed train ground settlement prediction method based on a three-dimensional geologic model and back analysis. The method comprises the following steps of S1, obtaining geological survey data, the underground water level and ground settlement monitoring data in a study area; S2, constructing a regional three-dimensional geological model; S3, calculating the regional underground water level change; S4, constructing a regional ground settlement model; S5, conducting back analysis calculation on stratum mechanical parameters; S6, conducting prediction calculation on the regional ground settlement amount. According to the along-G-series high-speed train ground settlement prediction method, the geological survey data, the underground water level and the ground settlement monitoring data of G-series high-speed train engineering are utilized, and with the combination of back analysis, a three-dimensional ground settlement prediction model which can consider the uneven spatial distribution of the soil layer thickness and the soil body mechanical parameters is constructed. The along-G-series high-speed train ground settlement prediction method has high prediction precision, and can be widely applied to prediction of the ground settlement amount caused by the change of the water level along the G-series high-speed trains.

The invention belongs to the technical field of engineering measurement, and relates to a device for measuring ground settlement, in particular to a device for measuring the settlement of a tunnel or a subway pipeline by combining an optical fiber grating sensor. The device for measuring the ground settlement comprises the optical fiber grating sensor, and is characterized by also comprising a lever and three supports which are positioned under any three positions of the lever respectively; the bottoms of the three supports are fixed on the ground; the tops of the supports are connected with the lever positioned over the supports or the optical fiber grating sensor; and when the tops of the supports are connected with one end of the optical fiber grating sensor, the other end of the optical fiber grating sensor is connected with the lever positioned over the optical fiber grating sensor. The device has the advantages of simple structure and measuring accuracy.

The invention relates to a construction method for treating operating metro tunnel settlement by using an anchor cable method, wherein a horizontal directional driller is utilized to drill along a design arc curve so as to form a pilot hole, then the guiding drill bit is replaced by a reversed broaching bit, the driller is backed and a stranded wire is pulled back at one time, a concrete pier with a reserved channel for passing through the stranded wire and a foundation pile for supporting the concrete pier are casted in the buried point and unearthed point of the stranded wire, a prestressing force is applied, and a construction of prestress anchor cable system passing through the downside of the operating metro tunnel is formed; in soft earth area, the prestress anchor cable system is arranged in every 200-600 meters along the direction of the operating metro tunnel. The technical method belongs to a trenchless construction technology, the project amount is less, the construction cost is low, and the influence on peripheral buildings and environment is less; and during the construction, not only can the normal operation of the metro tunnel be not influenced, but also the differential subsidence deformation of the metro tunnel in soft earth area caused by ground settlement can be effectively solved, the charge for long term maintenance is reduced, and the operation safety is ensured.

The invention relates to a water level cycle rising and falling induced ground settlement test apparatus and a test method thereof. The apparatus comprises a model column (23) used for containing soil for test, a water supply unit, a water drainage unit, a data measurement unit and a data acquisition unit, the bottom of the model column is provided with a model column water inlet (18) and a model column water outlet (19), the water supply unit is connected with the model column water inlet (18), the water drainage unit is connected with the model column water outlet (19), the data measurement unit is arranged in the soil for test in the model column (23), and the data acquisition unit is connected with the data measurement unit; and the on or off state of the water supply unit and the water drainage unit is adjusted to carry out water level cycle rising and falling adjustment, the data measurement unit measures data information of the soil for test in the model column (23), and the data acquisition unit acquires data information, and analyzes the data information. Compared with the prior art, the apparatus and the method realize effective research of the change rules of the settlement volume, the soil pressure and the aperture water pressure of different soil layers, induced by water level cycle rising and falling.

The invention discloses a ground settlement space monitoring method through Kriging interpolation based on a genetic algorithm. The method comprises the following steps of: acquiring coordinates and ground settlement of monitoring points; calculating distance among the monitoring points; dividing the distance into distance groups; calculating variation function values corresponding to the distance groups; determining a variation function model and fitting a variation curve; solving a Kriging weight coefficient; calculating settlement estimated values and conducting iterative computation; and encrypting settlement monitoring results through a grid method. On the basis of the traditional Kriging algorithm, the genetic algorithm is introduced, the variation function model is fit and natural logarithm is taken for regionalized variables, so as to reduce influences caused by distribution problems and abnormal values. Compared with the traditional settlement monitoring model, the ground settlement space monitoring method through Kriging interpolation based on the genetic algorithm has the characteristics of high estimation accuracy, high reliability and the like.

The invention relates to the construction field of excavation of tunnels under airports, in particular to a full automatic high-frequency ground settlement monitoring method for an airport. The full automatic high-frequency ground settlement monitoring method comprises the following steps of A, arranging an automatic detection overhead platform besides a monitoring area, and mounting a total station on the automatic detection overhead platform; B, arranging a plurality of monitoring points in an array of a monitoring area; C, using a point jumping method to measure the monitoring points in a triangular elevation way, and monitoring the change of the height. The full automatic high-frequency ground settlement monitoring method for the airport has the advantages that the actual condition can be reflected by the monitoring data, the monitoring process meets the takeoff and landing limiting requirements of the aircraft, and the monitoring cost is reduced.

The invention discloses a determination method for a critical plastic yield-point and an initial elastic modulus of a soil stress-strain curve. The method comprises three parts, i.e., triaxial test of soil, determination of a critical plastic yield-point and determination of an initial elastic modulus; the triaxial test is a traditional triaxial test, and a sample to be tested is cylindrical; the determination of the critical plastic yield-point is carried out through determination of a linear correlation coefficient of a fitting straight line; the initial elastic modulus is obtained through the slope of the fitting straight line. The determination method provided in the invention has the advantages of simple test, concise calculation and convenient operation, and has an important meaning for research on establishment of soil constitutive models, engineering numerical simulation, evaluation of foundation stabilization, ground settlement, especially settlement caused by small deformation, etc.

The invention provides a construction method for an earth pressure balance shield tunneling machine to laterally penetrate through an initially-supporting mined tunnel at a close range. The construction method comprises the following specific steps that firstly lofting is conducted on site to determine the side boundaries of two tunnels, construction of the mined tunnel is stopped, construction of partition piles is started, and an inclinometer, mined tunnel monitoring points and ground settlement monitoring points are laid; then initial values of all the monitoring points are collected, the shield tunneling machine starts to tunnel normally, data are collected, processed and analyzed, obtained information is fed back to constructors in time, and mining protective measures and tunneling parameters of the shield tunneling machine are dynamically adjusted; and finally after the shield tunneling machine passes through the mined tunnel smoothly, tunneling of the mined tunnel is started. The construction method for the earth pressure balance shield tunneling machine to laterally penetrate through the initially-supporting mined tunnel at the close range can quickly provide conditions and construction parameter guidance for shield construction, reduces the safety risk of mined tunnel construction, provides effective soil changing forms, and has good social effects and economic benefits in the aspects of construction periods, cost, safety, quality, and the like.

The invention discloses a pole tower emergency failure warning method under ground settlement condition. The invention locates the weak point of the pole tower under the ground settlement condition through the finite element simulation calculation, and provides guidance for the selection of strain measuring points; The safety margin of the tower under the ground settlement condition can be given accurately by analyzing the influence of the foundation change on the strain change of the measuring point. Through the real-time monitoring of the tower steel structure strain in a short time, combined with the results of finite element simulation analysis, it can effectively reflect the tower safety status and play a role of failure early warning, which is convenient for line operators to make correct emergency decisions. In addition, the invention provides a non-contact type tower strain real-time monitoring method and flow based on a substrate and a fixture, which can overcome the shortcomings such as installation and maintenance difficulties caused by the strain gauge directly pasted on the tower, easy dampness of the sensor and the like, and can be widely applied to the dangerous tower steel structure strain real-time monitoring under the short-term inland foundation settlement condition.

The invention discloses a rectangular pipe jacking construction technology, and particularly discloses a construction method for opening a hole between rectangular pipe jacking channels. The construction method comprises the following steps: construction preparation, freezing hole construction, freezing station mounting, active freezing and maintenance freezing, excavating and building construction, freezing hole plugging, and thaw settlement grouting. Through the arrangement of a freezing hole, and arrangement of preventive measures in the construction process of the freezing hole, the construction safety and the construction effect are ensured; for contact channel excavating and building construction, earth excavation is carried out in a layering and blocking removal way, so that the structural stability after contact channel construction is ensured and damage to a surrounding structure is small; after completion of the contact channel construction, the thaw settlement grouting is performed through grouting holes preserved in the two sides of the hole opened between the pipe jacking channels, and preserved in a top plate and a bottom plate, so that ground settlement and structural deformation are controlled; by the construction method, the construction problem of the hole between the rectangular pipe jacking channels is solved, the construction process is safe, the opened channel structure is stable and reliable, and the construction efficiency is high.

The invention discloses an underground comprehensive pipe gallery prefabricated assembling construction method. The underground comprehensive pipe gallery prefabricated assembling construction methodcomprises the following steps that (1), a mold and a reinforcement cage are prepared; (2) concrete is poured and vibrated; (3), steam curing and demoulding are carried out, (4), lifting and transportation are carried out; and (5), assembling is carried out. A BIM modeling is carried out before the step (1) is carried out; reinforcing steel bar cage construction is formed by auxiliary binding andbinding of a reinforcing steel bar shaping tire film; after the reinforcing steel bar cage is put into a mold, a hanging nail and a bolt are pre-buried; after concrete pouring is completed, an auxiliary angle at the corner position of the inner wall of a prefabricated pipe gallery is carried out, and a tensioning groove is formed in the middle of the auxiliary angle; and a first section of the prefabricated pipe gallery is spliced from the lowest gradient, and when two sections of two pipe gallery are assembled, a jack is combined to carry out opposite angle tensioning until the four corner parts are tensioned and pulled. The reinforcement cage can be smoothly fed into a die once, the pipe gallery structure does not need to be punctured in the pipe gallery when a support is hoisted and installed, the influence of ground settlement on the pipe gallery can be effectively prevented, and the construction efficiency and the construction quality are improved.

The invention discloses a method for characterizing spatio-temporal evolution of ground settlement, and belongs to the field of geological disasters. According to the method for characterizing the spatio-temporal evolution of the ground settlement, radar image data is involved; the spatio-temporal evolution of the ground settlement of a region is quantified, so that the change of the ground settlement rate of each ground pixel can be mastered, and the development trend and direction of historical ground settlement can be showed; and therefore, a basis is provided for urban disaster preventionand urban planning, a specific method for solving a ground settlement disaster is looked for, and the time and the economic cost are saved for urban disaster prevention and control.

The invention discloses a molded lining support structure and a construction method for a soft soil ground layer. The molded lining support structure comprises a closed lining support, the closed lining support comprises a plurality of steel tubes, first connecting steel plates, second connecting steel plates and concrete, the steel tubes are longitudinally and uniformly arranged, the adjacent steel tubes are communicated through the first connecting steel plates and the second connecting steel plates, and the concrete is poured in the steel tubes and spaces enclosed by the adjacent steel tubes, the first connecting steel plates and the second connecting steel plates. The molded lining support structure provides closed permanent lining support for an underground excavation project before the underground excavation project is excavated. Excavation workers do not need to worry about the problems of ground settlement and the like caused by unstable tunnel faces when large-area soil is excavated for the underground excavation project under the support of the closed lining support structure, so that the molded lining support structure and the construction method can be applied to any soft ground layers, and have the advantages of high construction process safety and mechanization degree.