2899results about "Foundation testing" patented technology

The invention relates to a testing platform with ground and slope engineering module. Long edge at one side of the main structure side steel plate has an instrument burying hole and data leading out hole, the other side having viewing window, bottom of the rectangular structural module slot rubble and sand cushion having water pipe supply net that connects with the water tank and vacuum extraction device, one side of the short edge of the main body structural side steel plate having discharge hole, two sides of the main structural beam post overpass the latched the reverse beam, whose lower end having hydraulic jack, ball hinges and bearing plate formed servo bearing system, displacement sensor, sand pressure sensor and gap water pressure connected to form the monitoring system. It can be deployed to prevent disasters.

The invention provides an intelligent fiber reinforced plastic (FRP) anchor rod, and belongs to the technical field of safety monitoring of geotechnical engineering. The intelligent FRP anchor rod is characterized in that the rod body is sequentially equipped with a fiber-fiber Bragg grating (FBG) sensor and an FRP wrapping layer from inside to outside, wherein the fiber-FBG sensor refers to a single-mode fiber in which one or more FBGs are written, or two parallel sensing fibers (including one common single-mode fiber and one single-mode fiber in which one or more FBGs are written). In the invention, the fiber-FBG sensor respectively transmits the sensed temperature or strain optical signals to a Raman optical time-domain reflectometry (ROTDR) demodulator, a Brillouin optical time-domainanalysis/reflectometry (BOTDA/R) demodulator and an FBG demodulator through optical switch connection and conversion. The intelligent FRP anchor rod has the beneficial effects that the embedded fiber-FBG sensor integrates test advantages of an ROTDR temperature measurement technology, a BOTDA/R test technology and an FBG test technology, thus improving reliability for long-term test of ambient temperature and strain state of the anchor rod.

The invention discloses a method for detecting the strain/stress of a pile body by a prestress pipe pile field static load test, comprising the following steps of: pre-burying a strain gauge in a prestress pipe pile; leading out a lead in the piling process of the prestress pipe pile; before producing the prestress pipe pile, pre-burying an additional reinforcing steel bar with the stress gauge in a reinforcing cage, leading the lead connected with the stress gauge to a near-end part of the steel reinforcing bar of the reinforcing cage along the additional steel reinforcing bar and fixing the lead, placing the reinforcing cage in which the additional reinforcing steel bar with the stress gauge is buried into a steel die produced by the prestress pipe pile and producing the prestress pipe pile according to a normal production process except high-pressure steam curing; and binding all leads of each pipe pile during piling on the fixed device at the position of the section of the pipe pile, which is close to the end part, pulling all leads of next section of pile during pile connection to the fixed device of the last section of pile from a pile cavity and fixing and leading out the leads from the end head at the top of the pile, on which a groove opening is arranged in advance. The invention is applied to the field of civil construction engineering, can be simply and conveniently operated and has high precision and favorable economy.

The present invention relates to an urban underground engineering simulation test system, underground water simulation system and data acquisition system, in which the simulation box contains horizontal loading plate, horizontal loading device, vertical loading device and several layers of horizontal water inlet pipes. Said invention can implement three-dimensional simulation test of various urban underground railway engineering, tunnel and anderground cave engineering, ground base an foundation work, special underground construction method, side slope engineering and retaining wall engineering, etc.

An apparatus measures a supporting force of ferroconcrete piles by means of a bi-directional front end oil pressure loading apparatus using a high pressure loading system capable of measuring a supporting force, a sinking amount and an axis load distribution on the ferroconcrete piles. The apparatus comprises: a steel plate having a predetermined thickness and diameter and including upper and lower discs having penetration holes through which concrete passes; a fixing member for separating the discs from each other by a predetermined distance; a high oil pressure cylinder for producing an oil pressure force; an oil cylinder inflation displacement measuring sensor for measuring a displacement; an upper displacement measuring rod coupled to the upper disc for measuring a displacement of the upper disc; a lower displacement measuring rod coupled to the upper disc for measuring a displacement of the lower disc; an axis load transition measuring instrument including a tremie induction tube coupled to the upper disc for guiding concrete to the penetration holes; iron elements coupled to the upper disc; a load sensor for measuring ground abrasion; and a sensor line for transferring a signal and current to the load sensor. A corresponding method is disclosed.

The invention discloses a method for monitoring the structure health based on a distributed strain dynamic test; the invention adopts a distributed strain transducer to build a distributed sensing network and selects to arrange a reference transducer, carries out structure system simulation state analyzing to obtain a distributed strain simulation state vector DMSV, originally takes whether a target characteristic vector Alpha changes or not as a criterion to identify structural damage, obtains the effects of being capable of rapidly, accurately and effectively capturing the structural damage and locating, and simultaneously adopts the reasonable measures of real time image display and deleting redundant data on time, thereby having the advantages of small errors, high precision, simple process and intuitionistic monitoring; the method can eliminate the interference of noise and environment under the conditions of uncertain loading and an unknown mathematical model, carry out on-line structural damage detecting and diagnosing in real time and is suitable for long period monitoring of various engineering structures, especially for the civil structure.

The invention discloses a tunnel surrounding rock monitoring method based on multifunctional intelligent anchor rods. The tunnel surrounding rock monitoring method comprises the steps of: selecting a fracture surface to be monitored for monitoring according to analysis data such as geological conditions of a tunnel, the design of a supporting structure, the surrounding environment, the vulnerability and the like; converging the anchor rods distributed at different positions of the tunnel to a fiber bragg grating demodulator by means of leading-out armored optical fibers to form a monitoring sensor network; and connecting the fiber bragg grating demodulator (which is connected with the anchor rods) with a control computer, and constructing a surrounding rock monitoring system by means of monitoring system software. The tunnel surrounding rock monitoring method is simple and reliable in principle, can be used for testing axial forces and longitudinal distribution situations of the anchor rods to obtain a surrounding rod pressure of the tunnel, and can be used for calculating an deformation amount of surrounding rocks of an excavation surface or an deformation amount of surrounding rocks of a section. The tunnel surrounding rock monitoring method can be applied to the construction monitoring during the excavation of a tunnel adopting a new Austrian tunneling method, and can be applied to tunnel deformation and stability monitoring later during the operation period.

The invention relates to a method for reinforcing a soft soil foundation at a deep mixing pile, which comprises the steps of land formation, construction layout, spray mixing and sinking, curing agent grout mixing, stirring and hoisting, repeated spray mixing and sinking, and shifting, etc.; and the main technological parameters are as follows: 0.55 to 0.75 of water-cement ratio, 0.38 to 0.75 m/min of sinking and empty stirring speed, 0.3 to 0.5 m/min of hoisting speed, 18 to 30L/min of guniting quantity and 0.5 to 0.7 MPa of guniting pressure. Compared with the existing cement mixing pile foundation reinforcing process, the method provided by the invention has the advantages of appropriate water-cement ratio, high pile quality, high strength, less reinforcing agent consumption, low cost and remarkable economic benefit, and is easy to evenly stir; and meanwhile, the method also has the following advantages: (1) the cement can be hydrated fully, and during construction, the role of the cement can be exerted completely; (2) the construction quality is easy to control and guarantee; and (3) the construction on deep piles can be performed.

The invention relates to a technology for performing foundation pile quality detection and geology survey by adopting a single tube longitudinal wave method. The technology is relevant to comprehensive testing of the actual using effect of a foundation pile and is characterized in that longitudinal wave transmitting downwards along a pile body is generated by knocking the top surface of the foundation pile, the longitudinal wave velocity and pile length of the foundation pile can be accurately measured by detecting the time difference of arrival of the longitudinal wave in a sounding pipe, and the quality of pile body concrete can be judged; actual measurement on the time difference of arrival of the longitudinal wave which is transmitted from the pile side soil along the knocked pile body can be conducted in adjacent pipelines or geological bore holes, and the length of the foundation pile, the pile body quality and the chambering degree can be measured; and the wave length of a geological soil layer can be measured, the condition of the geological soil layer around the pile can be judged, and the rock-inlet condition of the foundation pile can be analyzed. By means of the technology for performing foundation pile quality detection and geology survey by adopting the single tube longitudinal wave method, a signal processor can be configured externally or inserted in on the basis of the existing low-strain ultrasonic detection devices and the like, the technology can achieve foundation pile quality nondestructive testing and geology survey, is an economic and ready-made pile foundation nondestructive testing auxiliary validation method and can remarkably improve accuracy and service level of pile foundation quality decision.

This invention relates to one steel concrete structure anti-erosion test method in structure engineer field, which comprises the following steps: a, sensor processing to parallel two steel bars in same materials for fixing and sticking the stress fiber grating to top end and putting one free temperature compensation fiber grating connected by the compensation fiber and sealing on shell; b, positioning the sensor and drilling it into concrete with stress fiber and temperature compensation connected to spectrum; c, monitoring by periods to test grating wave length volume and speed to infer anti-erosion degree and speed.

The invention provides an opened tubular pile hammering injection and static load simulation experiment device and method. The simulation experiment device comprises a model box, a model pile, a vertical column assembly, transverse beam assemblies as well as a piling assembly and a static load assembly, wherein the model pile comprises an outer cylinder, an inner cylinder, a semicircular steel plate and a guide rod column; axial and radial sensors are arranged on the walls of the inner cylinder and outer cylinder; the vertical column assembly comprises four vertical columns which are in rigid connection with the periphery of the model box; the transverse beam assemblies comprise lower transverse beam assemblies and upper transverse beam assemblies; the pulley assembly is connected between the upper transverse assemblies. Compared with the prior art, the simulation experiment device has the advantages that a real stress filed of a soil mass can be simulated, and the friction on the inner and outer sides of the wall of an opened tubular pile can be respectively measured; the defect that in the prior art, the real load transfer process of the opened concrete tubular pile cannot be measured is overcome. Moreover, the simulation experiment device is simple to operate, and the simulation experiment method is convenient.

The invention discloses a method for checking artificial embankment body and foundation sink. The method comprises that embedding a deep sink detector and a shallow sink detector with hollow tubular structures in each checking layer along one normal line at object position in the artificial embankment body, and leading measuring device or measuring medium into a measuring channel formed by the shallow sink detector and a connecting tube, to measure the position change of the shallow sink detector and measure the height strike of the upper end of the connecting tube to find out the sink of each checking layer.

The invention discloses a pile foundation bearing characteristic model test device under a complicated load effect. The pile foundation bearing characteristic model test device comprises a model groove, a horizontal loading system, a vertical loading system and a measuring device. The model groove is made of an organic glass panel and is reinforced by channel steel. The horizontal loading system is composed of a pulley and a weight. The vertical loading system is composed of vertical channel steel, a counter-force beam, a lifting jack and a linear sliding guide rail. The measuring device comprises a minitype laser displacement sensor system which is used for measuring the horizontal displacement of a pile head and the sedimentation of a pile tip and can horizontally move along with the moving of the pile head. The measuring device further comprises a pull rope displacement sensor system which measures the horizontal displacement of a pile body. The invention further discloses the test method of the pile foundation bearing characteristic model test device. According to the pile foundation bearing characteristic model test device and method, loading is simple, the load direction is stable, the data of pile sedimentation, pile head horizontal displacement, pile body horizontal displacement and the like of a model can be accurately measured, the measured data is high in precision, and pile foundation bearing characteristic model test research under the complicated load effect can be conducted conveniently and effectively.

The invention discloses a real-time monitoring and early warning system for foundation pit engineering. The real-time monitoring and early warning system for foundation pit engineering comprises a cloud terminal server, a field monitoring data acquisition subsystem, a digital foundation pit information analysis and management subsystem and an early warning and information publish subsystem. The field monitoring data acquisition subsystem is used for monitoring a plurality of monitoring points on the construction site in real time to obtain monitoring data, and uploading the monitoring data to the cloud terminal server. The digital foundation pit information analysis and management subsystem is used for predicting the monitoring data to generate predicted data, generating early warning information when the predicted data exceed preset warning values, and updating the early warning information to the cloud terminal server. The early warning and information publish subsystem is used for reminding staff of the situation according to the early warning information. The real-time monitoring and early warning system achieves automatic acquisition and transmission of the monitoring data, conducts prediction according to the monitoring data to generate the predicted data, generates the early warning information when the predicted data exceed the preset warning values, and reminds the staff of the situation according to the early warning information, and therefore the automatic and intelligent level of management, prediction and early warning of information of the construction site is greatly improved.

The invention relates to a foundation pile static test loading counterforce test method and weight boxes used by the same. The test method comprises the following steps: arranging a jack in fit connection with a test apparatus on the top of a foundation pile to be tested; stacking and loading balances on a bearing platform under the cooperation of an auxiliary support structure; and testing the loading bearing capacity of the foundation pile to be tested through the test apparatus in fit connection with the jack when the jack gradually jacks up the bearing platform, wherein the balances stacked and loaded on the bearing platform is the piled balance material loaded in a plurality of the weight boxes. The weight boxes which are used in the test method for loading the balance material are particularly detachable combined type weight boxes. After assembly on the site, the weight boxes can be put into use when a loading machine is used to load the local balance material such as sandstone into the boxes. The test method is simple, convenient and quick, greatly reduces the construction cost, and has high safety. In addition, the test method can be used in a random sampling test of the static test for a large-tonnage filling pile.

The invention discloses a method for measuring deformation of an underground diaphragm wall. In the aspect of data acquisition, a three-dimensional laser scanner is adopted and is capable of quickly measuring three-dimensional coordinates of the underground diaphragm wall; working base points are used as joint control points, a control network is established through the layout of deformation monitoring working base points and datum points, the underground diaphragm wall and the working base points can be simultaneously scanned, and point clouds of the underground diaphragm wall can be registered in an absolute coordinate system of the control network. In the aspect of data processing, a point cloud regular gridding modeling technology is adopted to reconstruct a three-dimensional model of the underground diaphragm wall. By comparing the three-dimensional models of the underground diaphragm wall in different periods, the deformation of all the positions of the underground diaphragm wall can be obtained. Through the method, the overall deformation of the underground diaphragm wall can be measured in the excavation process of a foundation pit, monitoring points do not need to be laid, interference on the construction is reduced, the measuring efficiency is high, and comprehensive monitoring data are provided for the excavation of the foundation pit.

The invention relates to a centrifugal model testing device for simulating the pressure water head change and stability of a foundation pit. The device comprises a model tank body, a water tank clapboard, foundation pit continuous wall simulation boards, a foundation pit enclosure wall inner support and a sensor, wherein the water tank clapboard is arranged in the model tank body, and partitions the model tank body into a water tank and a soil body tank; the bottoms of the water tank and the soil tank are communicated with each other; the bottom of the water tank and the inside of the soil body tank are filled with a soil body; two foundation pit continuous wall simulation boards are arranged in parallel in the soil body tank; the foundation pit enclosure wall inner support is vertically arranged between the two foundation pit continuous wall simulation boards; the sensor is arranged in the soil body. Compared with the prior art, the centrifugal model testing device has the advantages that the influence of the change of the water body pressure on the foundation pit environment effect and inrush stability is simulated through the water tank clapboard, and an intuitional testing effect is achieved.

The invention discloses a method and device for carbonizing and curing soil. The soil carbonizing and curing method comprises the steps of: stirring and mixing a soil body needing to be cured and a curing agent according to the mass ratio of (12-19): (8-1) uniformly; and then introducing carbon dioxide gas in the cured soil to carbonize the cured soil body so as to form carbonate compound cured soil. The curing agent comprises active magnesium oxide. The device used for carbonizing and curing soil comprises a carbon dioxide generator and an outer sleeve, wherein a through hole used as a carbon dioxide outlet is arranged on the wall of the outer sleeve, a carbon dioxide inlet pipe is connected to the carbon dioxide generator, the carbon dioxide outlet on the carbon dioxide generator is connected with one end of the carbon dioxide inlet pipe, and the other end of the carbon dioxide inlet pipe is positioned in the outer sleeve. A sealing film is sleeved on the carbon dioxide inlet pipe, covers the top part of the outer sleeve and extends to the exterior of the outer sleeve. A gas seal ring is arranged between the outer sleeve and the carbon dioxide inlet pipe, and positioned on the top of the outer sleeve.

The invention discloses an indoor power drainage consolidation testing system and method, relating to an indoor rock mechanics testing system and method. The system is composed of shock load applying device, straining three-axis pressure room, stress and strain senor, dynamic resistance strain meter, floating engineering dynamic meter, PC, and pressure frame; and the method includes the steps: (1) according to the diameter size of a sample, drilling a bore along the axis of the sample in proportion, and filling fine sand into it; (2) placing the drilled sample in the pressure room for reversal pressure saturation; (3) installing the shock load applying device on a force transferring pole, and installing the stress and strain sensor for testing aperture water pressure, shock stress and axial strain; (4) using data collector to make dynamic signal collection, transmission and recording.

The invention discloses a prestressed concrete pipe pile horizontal bearing characteristic test model and a test method. The prestressed concrete pipe pile horizontal bearing characteristic test model comprises a model groove, a bearing table used for bearing a model pile is arranged in the model groove, and the upper end of the model pile is embedded into the bearing table. A vertical pneumatic loading system exerting vertical force on the bearing table and connected with a counter force frame is arranged above the model groove. The inner side of the model groove is provided with a horizontal pneumatic loading system exerting horizontal force on the bearing table and connected with the model groove. Monitoring devices are arranged on the bearing table, the model pile and the loading system. The invention provides a test device which can well meet the requirement for load conditions of a pile foundation load test, simulate the practical working conditions of the pile foundation more truly and detect the bearing characteristics of a single pipe pile and group pipe piles under the action of horizontal loads.

The invention discloses a construction method of a self-balancing method pile foundation bearing capacity test device, which is characterized by comprising the following processes of: 1, construction preparation: calculating a balance point position of self-balancing method pile measurement, determining the number of the pile measurement, drilling holes, cleaning the holes and detecting the verticality of the holes; 2, manufacturing a load box and welding the load box with a reinforcement cage; 3, mounting the reinforcement cage; 4, cleaning the holes again; 5, pouring concrete; and 6, carrying out self-balancing method detection. As the detection is directly carried out on engineering piles in some projects, in order to preventing the pile foundations from affecting the use, a grouting machine is used for filling gaps separated from pipelines and the load box with grout after the detection; therefore, the method also comprises the following process of: 7, carrying out pipeline grouting and reinforcement. According to the invention, the defects that the load box mounting time is long, the reinforcement cage floats upwards, the mud at the bottom of the load box is too thick, the pile foundations have gaps at the load box to influence the quality of the pile foundations, the construction progress is slow, and the like are overcome, and the pile foundations have good integrity.

The invention relates to a rotary drilling rig coordinated with percussion drill hole-forming construction method which comprises forming field, locating and paying off, measuring elevation, calculating rotary digging depth and installing a plurality of temperature sensors in a permanent steel protective cylinder; rechecking a pile position; rotationally digging and drilling into a tundra layer; burying a temporary steel protective cylinder; measuring the depth of a hole and checking the formed hole; burying the permanent steel protective cylinder into a non-tundra layer; pulling out the temporary steel protective cylinder and moving a machine to conduct next construction of forming the hole rotationally; secondarily locating and sampling; locating a percussion drill; punching the hole; meanwhile digging a mud pit, producing mud and pouring the mud into the hole; secondarily measuring the depth of the hole and checking the formed hole; cleaning the hole; processing a reinforcing cage and hanging the reinforcing cage; installing a guide tube and conducting a water sealing test on the guide tube; measuring sediment and pouring concrete underwater; and curing the concrete. The rotary drilling rig coordinated with percussion drill hole-forming construction method offers a feasible technical measure for socketed pile construction and road repairing on frozen earth on island shape frozen earth area at high altitude in China and has notable economic benefit.

The invention discloses a compaction degree test method, which comprises the following steps: (1) field data collection, (2) data processing and analysis, (3) S-wave velocity calculation under the most dense state, (4) water content calculation under the most dense state, and (5) compaction degree calculation; the invention also discloses a compaction degree tester based on the method; the compaction degree tester comprises a single-chip controller, a floating-point amplifying and sampling holding A/D converter, a high/low pass filter, a wave-trap, a preamp A/D converter, an on-site wiring checker, a data storage and a computer; the invention has the advantages that the apparatus is portable and power-saving, and has compact structure, easy operation, fast processing speed and wide application range.

This invention discloses one rock engineer physical analogue multi-function test device of tunable size, which comprises test case, load frame and screw block, wherein, the test case is inside frame rack; screw rack is fixed onto load frame; the screw block faces test case; the load frame is composed of upper beam, down beam, left standard beam and right beam. This invention relates to one module sizes rock engineer physical analogue multi-function test device.

The invention discloses a visual energy pile-soil load and temperature transmission mechanism model test device and test method. The device is characterized by comprising a transparent model groove, a transparent energy pile which is embedded in transparent soil of simulation pile peripheral soil and pile end soil is arranged in the groove, the transparent energy pile is hollow, the pile bottom is closed, a heat transfer pipe is arranged in the pile, the heat transfer pipe is in linkage with a cold and hot circulating mechanism, a fiber bragg grating which is used for measuring the axial force deformation and temperature changes of a pile body of the transparent energy pile is embedded on the side of the transparent energy pile, a soil pressure box used for measuring the pile bottom stress of the transparent energy pile is embedded in the pile bottom, a laser source arranged on a movable mechanism is arranged on one side outside the transparent model groove, digital cameras for observing the space of the transparent model groove are arranged on the front visual face and the lookdown face outside the transparent model groove, and the digital cameras are in linkage with a processing device through data lines. The test device is easy and convenient to operate and strong in repeatability. The similarity of the soil properties of the prepared transparent soil and the natural soil is good, and the test method can be used for exploring the energy pile-soil heat transmission mechanism and a load transmission mechanism.

The invention discloses a method for detecting the quality of existing building foundation piles with a parallel seismic method. The method comprising the following steps: PVC pipes which are parallel to the foundation piles are embedded near the foundation piles of the existing building; an engineering seismograph is used for testing earthquake wave which is transmitted from the foundation piles along the depth direction of the PVC pipes; and the length and the integrity of the foundation piles are judged according to the first arrival time and the amplitude of the earthquake wave which is received by a detector. The detecting method has a following theory that the propagation velocity of the earthquake wave on the foundation piles is far greater than the propagation velocity on pile foundation, while the attenuation quotient is less than that of the pile foundation, when the detector is far from the bottom ends of the foundation piles, the propagation distance of the received earthquake wave in the soil is magnified, so as to necessarily extend the lag of the first arrival time and accelerate the attenuation of the amplitude, in a similar way, the positions of the defects of the foundation piles also has the same phenomenon that the first arrival time is suddenly extended and the amplitude is suddenly attenuated, therefore, by comprehensively analyzing the first arrival time and the amplitude of the earthquake wave, the length and the integrity of the foundation piles can be judged.

The invention belongs to the technical field of pile foundation quality detection in civil engineering, in particular to a method for measuring pile shaft internal force and cross section displacementin vertical dead-load test of a foundation pile. In the method, firstly, a casing is embedded on a pile shaft lengthways or holes are directly drilled on the pile shaft lengthways; a measuring systemis arranged in the casing or the drilling hole and is composed of an anchor head, a multiple position extensometer, an extension bar and a pressure pipe, wherein, the pressure pipe pressurizes to expand the anchor head so as to ensure that the anchor head is fixed in the casing or the drilling hole; after the anchor head is fixed, the multiple position extensometer measures vertical deformation between two adjacent anchor heads by the extension bar; according to a vertical displacement observation result and vertical deformation between two adjacent anchor heads, the layering frictional resistance of each soil layer, pile end supporting force and the vertical displacement of anchor head embedding cross section are calculated, and the relation of pile soil relative displacement and pile side frictional resistance is built so as to realize pile shaft internal force and cross section vertical displacement measurement. The invention has high test accuracy and favorable reliability, can replace traditional method using strain or string-wire sensors and displacement rods to measure pile shaft internal force and cross section vertical displacement.

The invention discloses a device for testing a limited soil mass rigid retaining wall soil pressure model. The device comprises a model box, loading systems, a retaining wall and a measuring system. Toughened glass is fixedly embedded in the side face of the model box, and a rigid cushion block is welded to a model box base plate. A reaction frame is arranged on the loaded side, and eight groups of clamping steel blocks are welded to a frame. The two loading systems which can work independently are installed on the reaction frame and connected with a movable retaining wall through a fixed hinge support, and fixed boundaries are installed on the specific clamping steel blocks according to the earth filling width requirements. A micro soil pressure box is embedded in the retaining wall, and a dial gage is installed at the rear of the movable retaining wall. A digital camera is placed in front of the side face of the model box. Different earth filling widths, wall soil contact surfaces and retaining wall displacement and shifting modes are simulated, changes of active or passive soil pressure are monitored, and a soil mass displacement field and slip crack faces are studied. According to the device for testing the limited soil mass rigid retaining wall soil pressure model, effective test data support can be provided for studying the soil pressure problems on the conditions of limited soil mass, and help is provided for a follow-up theoretical analysis model.

The invention discloses a prestressed anchor foundation pit support and a construction method. The prestressed anchor foundation pit support is characterized in that inner anchoring section pouring quick setting and early-strength cement cartridge anchor agent are adopted during the construction of a prestressed anchor, early-strength cement is used for a gird, economic cement mortar is poured in a tensioning section, and anchor tensioning is achieved in such as way that a screw cap is screwed down with a torque wrench to be clocked. The construction method comprises the steps of anchor hole positioning, hole drilling, hole clearance, anchor fabrication, anchoring agent pouring into anchor hole, anchor installation, gird pouring, anchor tensioning, tensioning section pouring and construction monitoring. The invention has small space for the construction and operation, and is suitable for all topographic forms and sites. The inner support is replaced bythe anchor, thus the construction cost can be reduced, and the construction condition can be improved.

The invention discloses an ocean engineering pile foundation experiment simulation apparatus and method under long-term horizontal cyclic loading. The apparatus comprises: an osmotic force system which provides continuous pressurized water for a saturated sandy soil foundation so that a uniform osmotic flow field forms in the sandy soil foundation to simulate a hyper-gravity environment; a displacement control loading system and a force control loading system that apply horizontal cyclic loadings to an offshore wind turbine superstructure model; a measuring system used for measuring water pressure before the entry into the saturated sandy soil foundation, displacements of the offshore wind turbine superstructure model and a pile model, strain of the pile model, and surface displacement of sandy soil; an uninterrupted power supply system used for powering the osmotic force system, the displacement control loading system, the force control loading system and the measuring system, thereby ensuring all systems can run stably in a long time; the invention also provides an experiment method of the apparatus; the apparatus and the method are widely applicable and suitable for various ocean engineering structures such as oil platforms and offshore wind turbines.