1375results about "In situ soil foundation" patented technology

A direct shear tester for both portable field test and indoor test and a sampling and testing method are provided. The tester comprises a sampling device, a portable vertical load system and a horizontal shear system. The testing method comprises burying a rigid frame together with a cruciform shear frame in the soil of a place to be test, digging out the whole soil containing the rigid frame and the cruciform shear frame to obtain an integrated sample with less interference, placing and fixing the integrated sample in a rigid frame base on a box-shaped frame, applying a vertical force by using the portable vertical load system on the box-shaped frame, and measuring the strength of the sample by using the shear frame. During the test process, the volume change of the sample in the vertical direction is not limited. The tester has simple structure, easy operation and good portability. The testing method employs flexible tension shear mode instead of the rigid top-bunt shear mode, overcomes the friction and sampling problems, and avoids the vertical pressure offset during the test process by using the portable vertical loading system, thereby increasing the test accuracy.

A system adapted to determine a property of a paving-related material is provided. Such a system comprises a central computing system housing database, such as a geographic information system (GIS). A measuring device for selectively and directly measuring the property of the paving-related material is remotely disposed with respect to the central computing system and operably engaged with a locating device, such as a global positioning system (GPS) device, for determining a location of the measuring device when the property of the paving-related material is selectively measured thereby. A portable handheld computer device is in communication with the measuring device, the locating device, and the central computing system, wherein the handheld computer device is configured to receive data, comprising the measured property of the paving-related material and the corresponding location of the measuring device when the property is selectively measured thereby, from the measuring device and the locating device, and to communicate the data with the central computing system for incorporation of the data into the database. An associated device, apparatus, and method are also provided.

An acoustic logging apparatus comprises a drill collar conveyed on a drilling tubular in a borehole within a formation. At least one transmitter is disposed in the drill collar. The transmitter includes at least one magnetostrictive actuator cooperatively coupled by a flexure ring to a piston for converting a magnetostrictive actuator displacement into a related piston displacement for transmitting an acoustic signal in the formation.

A hold-down system used to secure a building structure to the foundation, thereby enabling the building to better withstand forces like high winds and earthquakes because these forces may then be distributed to the foundation. The hold-down system is characterized as being continuously threaded and having stackable, individual take-up units. A continuously threaded hold-down system allows the system to compensate for shrinkage or crushing of the building's frame throughout each level of the building because the anchor of the system is always in communication with the foundation of the building. The individual take-up units are stackable allowing each level of the system to compensate for shrinkage or crushing on that level as well as adjacent levels.

The invention belongs to the technical field of foundation pit deformation monitoring and particularly relates to a monitoring method of a bottom soil heave of an excavation foundation pit. The monitoring method comprises the specific steps of: arranging a prism hoisting device on a monitoring point at the bottom of an excavated foundation pit and fixing a prism at the top; erecting a total station for forming intervisibility with the prism on the ground outside the foundation pit so as to realize the aim of monitoring the deformation amount of the bottom soil heave of the foundation pit; meanwhile, selecting a standard point on a stable building outside the foundation pit and setting the prism so as to monitor a micro deformation amount of a work station and revise a measured value of the monitoring point according to the micro deformation amount, thus improving the measuring precision. The monitoring method disclosed by the invention has the advantages that the deformation amount of the bottom soil heave of the foundation pit is monitored in real time; the operation method is simple and convenient; a monitoring device is existing equipment, the cost is low and the measurement precision is high; the prism hoisting device can randomly adjust and measure the needed height so that the intervisibility is formed by the prism and the total station all the time; the monitoring method is particularly suitable for foundation pit engineering in an excavation process.

An access casing assembly structured for placement at least partially within a subterranean formation by forcing the access casing assembly thereinto, comprising a plurality of casing sections operably coupled to form a central elongated cavity for providing access to the subterranean region is disclosed. Further, a tip portion of the access casing assembly may include a porous filter through which liquid or gas may communicate with the central elongated cavity. Also, a receiving member or at least one engagement hub may form a portion of the central elongated cavity and may include an engagement feature configured for selectively and lockingly engaging a locking structure of a device to be positioned within the access casing assembly. Methods of use are disclosed. A tensiometer is disclosed including a chamber structured for allowing at least partially filling with a fluid subsequent to contact therewith.

Standard test methods for determining one-dimensional consolidation properties of soils using incremental loading in accordance with ASTM D2435, or AASHTO 216, and of those of other international and organizations, do not accurately predict the values of vertical settlement, coefficients of consolidation in horizontal and vertical directions, and modulus of elasticity in vertical direction, because fixed ring used in these tests do not allow horizontal settlement and dissipation of excess pore-water pressures in horizontal direction, whereas, in field, under application of a vertical load, both horizontal and vertical settlements occur along with dissipation of excess pore-water pressures in both vertical and horizontal directions. To overcome this more than 100 year old problem, the inventor (Dr. Ramesh Chandra Gupta, Ph. D., P.E.) has invented a test device for determining three-dimensional consolidation properties of soils, using a flexible ring which permits development of horizontal and vertical displacements, and dissipation of excess pore-water pressures in both horizontal and vertical directions, along with increased lateral resistance as takes place in field at any depth in a soil deposit when vertical load at the surface is applied.

The flexible ring consists of filter fabric around the soil specimen, rubber membrane around the filter fabric, circular segmental metal plates around the membrane and elastomeric rubber bands or spring loaded jacket around the segmental plates, and allows horizontal and vertical displacements, dissipation of pore-water pressures in horizontal and vertical directions to take place with increased lateral resistance with each increment of vertical load like those in the field. Thus new test device simulates field condition to allow accurate determination of three-dimensional consolidation properties of soils (such as settlements, coefficients of consolidation in horizontal and vertical directions, and modulus of elasticity).

For this new test device, conventional incremental consolidation frame or triaxial type chamber system either with the triaxial loading system or modified to adapt to incremental consolidation frame, shall be used to perform three-dimensional consolidation tests.

The invention relates to a device and a method for measuring soil body displacement. The device comprises a sedimentation pipe or an inclinometer pipe, a magnet ring locating sensor and a data acquisition device. The sedimentation pipe or the inclinometer pipe is embedded in the soil body. The magnet ring locating sensor is parallelly arranged inside the sedimentation pipe or the inclinometer pipe and covers displacement changing range of a magnet ring in the whole journey, serves as a measuring basis, is constant in fixed position and comprises a plurality of magnetic sensitive elements, a strip-shaped support piece and a detection circuit. The device and the method can achieve automatic intelligent measurement of soil body displacement, are suitable for measurement of relative displacement of the soil body in one direction, and have the advantages of being simple in use and good in measuring reliability.

A mobile turf instrument apparatus has a wheeled frame that may be propelled over the ground by a motive device, such as by a separate vehicle or by its own engine and drive train. A driven arm is carried on the frame and revolves in circles to periodically insert the probe(s) of a probe assembly into the ground during motion of the frame. The drive to the arm is momentarily disengaged when the probe(s) of the probe assembly are inserted into the ground. The probe assembly comprises two parts that rock relative to one another. Two soil measurement devices are connected to the probe assembly. A soil moisture sensor is coupled to the probe assembly for measuring soil moisture when the probe(s) are inserted into the ground. A load cell is responsive to the amount of rocking of the two parts of the probe assembly to measure soil compaction.

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.

In this invention, after a hole has been drilled or excavated, injection probe(s) are placed at appropriate depth(s), the excavated native materials are replaced with appropriately sized crushed rock or other natural or synthetic materials, and then a polymeric resin is injected through the probe(s) to encapsulate and bind the fill material, whereby upon curing the polymeric resin and fill material forms a foam friction pile. Such friction piles drilled or excavated adjacent to each other will form a foam sheet piling system. The foam piles can also be re-enforced using nylon, polypropylene, fiberglass, other synthetic or non-synthetic materials or combinations of these materials. The polymeric resin typically would comprise a high density closed cell, water resistant expanding two component polyurethane foam system.

Standard test methods using a fixed ring for determining one-dimensional consolidation properties of soils represent a subsurface condition where settlement and dissipation of excess pore pressure is possible only in vertical direction. This subsurface condition never occurs, as settlements and dissipation of excess pore pressures always occur in horizontal and vertical directions. Dr. Ramesh Gupta has invented a test device for determining three-dimensional consolidation properties of soils, using a flexible ring permitting displacements and dissipation of excess pore pressures in both horizontal and vertical directions, and affording determination of coefficients of consolidation in horizontal and vertical directions including three-dimensional coefficient of consolidation, and modulus of elasticity. The test device consists of a flexible ring consisting of filter fabric around the soil specimen, rubber membrane around the filter, circular segmented metal plates around the membrane and rubber bands or rings around the plates. Both incremental or triaxial type loading can be used with this device.

The invention discloses a reinforcement method and a reinforcement structure for treating railway soft soil roadbed settlement overweight before operation. The reinforcement structure mainly consists of five parts, namely a main bearing structure system, a reinforced cushion layer structure system, a foundation bed drainage system, a settlement observation system and a reserved grouting system. The technical problems that the existing roadbed is greatly damaged, the construction period is long, the construction property is low, the quality is difficult to control and the problem that the soft soil roadbed settlement overweight is caused in the conventional technical scheme are effectively solved.

The invention relates to a lower-bound limit analysis method of bearing capacity considering rock translation and rotation effects at the same time, and belongs to the technical field of rock slope stability analysis. According to the method, a rigid block unit is scattered as a geometry system of a rigid rock and a structural plane, the normal force, shearing force and bending moment of the structural plane are used as unknown quantities, a static permission stress field satisfying an equilibrium equation considering the translation and rotation effects of the rigid block unit, structural plane shear yield conditions, structural plane tensile yield conditions, structural plane rotational yield conditions and static boundary conditions is constructed, an overload coefficient is used as a target function, and a lower-bound linear mathematic programming model is built; the linear mathematic programming model is solved by means of an interior point algorithm, a strength reserve coefficient is solved by means of an iterative method at the same time, and the lower-bound solution and corresponding yield area of the overload coefficient or the strength reserve coefficient of the jointed rock slope are acquired. The method has the advantages that the concept is clear and the computational accuracy is high, and the method can be applicable to bearing capacity analysis of translational or rotational failure of the jointed rock slope.

A system for collecting soil solution samples including a sampling device arranged to contact soil and coupled to a vacuum source, and a suction unit for automatically controlling pressure and time of operation of the vacuum source to provide suction for withdrawing solution from the soil through the sampling device and abrupt release of the vacuum at the end of a pre-defined sampling period, and a method for collecting soil solution samples including coupling a sampling device to a vacuum source, planting the sampling device in soil to be monitored, automatically controlling pressure and time of operation of the vacuum source to provide suction for withdrawing solution from the soil through said sampling device, and automatically stopping the vacuum source and abruptly releasing the vacuum at the end of a pre-defined sampling period.

A non-destructive method of measuring physical characteristics of a medium, such as uncemented sediment, sandstone, or limestone. A pseudo-random code is generated and is used to generate a pseudo-random acoustic signal. This signal is transmitted into the medium to be measured through the use of a transducer, such as a piezoelectric element, and is received by a plurality of hydrophones. The received signal is then processed to obtain an image of its velocity and attenuation. A universal geoacoustic model of the medium for a given set of measured data is determined, and the model is solved to obtain a pair of permeability-porosity results for the medium. The one of this pair of permeability-porosity results which is correctly indicative of the physical characteristics of the medium is then determined.

The logging tool of this invention includes a transmitter conveyed on a drilling collar for exciting a quadrupole signal in a borehole being drilled by a drill bit and a receiver for receiving the signal. The transmitter is operated at a frequency below the cut-off frequency of the quadrupole collar mode. The received signal consists primarily of the formation quadrupole mode which, at low frequencies, has a velocity that approaches the formation shear velocity. The transmitter, in one embodiment, consists of eight equal sectors of a piezoelectric cylinder mounted on the rim of the drilling collar. The value of the cut-off frequency is primarily dependent on the thickness of the drilling collar. Alternatively, the transmitter may be operated to produce both the collar mode and the formation mode and a processor may be used to filter out the collar mode.

A ball penetrometer probe for in situ measurement of soft soil properties, particularly in the seabed, comprises a spherical body and slender shaft assembly, and either individually or in combination, an anti-friction sleeve enclosing the shaft and/or a peripheral porous ring on the spherical body with connecting internal passages through the shaft assembly, the shaft being adapted to attach to an electronic transducer module. The ball penetrometer is deployed to penetrate the soil bed, to continuously measure the soil bearing forces resisting penetration and withdrawal of the ball, to optionally measure the pore water pressure of the soil in contact with the ball and to transmit the measurement data from the probe to a remote operating station, either by wireless means such as an acoustic transducer or via a wired electrical connection.

The invention relates to a method of detecting stability of a rock mass side slope and warning and forecasting instability of the side slope by adopting motive power increment displacement response ratio parameters. A motive power monitoring and warning method of rock mass landslide includes the following steps: (1) ensuring side slope geometric elements to be detected, mapping of a sliding surface and self weight of a landslide body, (2) designing and arranging side slope downward sliding motive power and displacement monitoring points, (3) monitoring and ensuring the side slope downward sliding motive power and downward sliding displacement response, (4) ensuring side slope downward sliding motive power loading rate parameters, (5) ensuring side slope downward sliding displacement response rate parameters, (6) ensuring landslide motive power increment displacement response rate parameters, (7) ensuring a landslide stability motive power increment displacement response rate criterion, and (8) monitoring side slope stability and monitoring and early warning. Stability coefficients of a limit equilibrium method are organically coupled with a displacement timing sequence analytic method and characteristics of displacement predictive parameters, and limitations of a traditional method are overcome.

The invention discloses a detection system for the tamping settlement of a heavy tamping machine, wherein the heavy tamping machine is taken as a foundation. The detection system comprises a programmable logic controller (PLC), an oil pressure sensor, a coder and a displayer, wherein the input end of the PLC is connected with the oil pressure sensor and the coder; the output end of the PLC is connected with the displayer; the input end of the oil pressure sensor is connected with a winch motor; the output end of the oil pressure sensor is connected with the PLC; the oil pressure sensor is used for transmitting a detected pressure value to the PLC; the input end of the coder is connected with the winch motor; the output end of the coder is connected with the PLC; the coder is used for transmitting the detected rope folding length of a steel wire rope to the PLC; the input end of the displayer is connected with the PLC; and the tamping settlement of the heavy tamping machine in one-time operation is displayed through the display. By adopting the PLC, the detection system disclosed by the invention has high detection precision and small error and can be used for various heavy tamping devices; in addition, the detection system has the advantages of convenience for mounting, simpleness for debugging, high reliability and low prices.

The invention discloses a civil engineering foundation pit construction monitoring system and monitoring method. The monitoring system comprises a man-machine operation module, a data acquisition module, a video data acquisition module, a central processing unit, a prediction analysis module, an expert evaluation module, a physical model building module, a virtual actuator, a virtual sensor, a simulation analysis module and an alarm modules. The system is safe, practical, convenient, real-time and effective, avoids safety problems in foundation pit construction monitoring, can be used in various construction environment sites to eliminate safety information hidden dangers in a construction process, can effectively detect and manage the construction site, and maintains the normal operation of a detection system of the construction site.

The invention discloses a huge ultradeep foundation pit accurate subsidence and environmentally-friendly construction method, which belongs to the technical field of constructional engineering. In the design and construction process of a huge ultradeep foundation pit, the accurate prediction and control of the subsidence of the ground surrounding the foundation pit due to compression of a water-bearing stratum during the pumping of confined water in the pit are performed. In the invention, the operation is simple, a handling method is reasonably determined and selected when the subsidence is subsidence is predicted accurately, and thus, the subsidence of the surrounding ground is controlled, environment is protected and the method is an economic construction method.

An in-situ rotation contact method for the prospecting of rock and earth engineering features that the continuously applied pressure, rotational torque, water supplying pressure and their variations with the depth change of stratum are used to reflect the engineering properties of said stratum, directly and mechanically layer the stratum, and determine the load-bearing power, deformation modulus and anti-shear strength of foundation. Its dedicated apparatus is composed of a land data reader, and a underground prospecting rod unit consisting of prospecting rod, probe, and data acquisition and memory device.

The invention discloses a monitoring device for foundation pit deep horizontal displacement and the underground water level. The monitoring device comprises a monitoring module which is formed by detachably assembling a plurality of monitoring units in series. Universal couplings are adopted for mechanical connection between the monitoring units. Electric power and electric signals are all connected through cables with aviation plugs or sockets. According to the monitoring device for the foundation pit deep horizontal displacement and the underground water level, the multiple inclination monitoring units are connected in series, and therefore the monitoring device can adapt to deformation of a monitoring hole and can continuously monitor inclination changes of the monitoring hole for a long time in the monitoring hole. All the monitoring units are connected through spherical joints, the monitoring device can still be sunk into or be pulled out of the monitoring hole freely under the condition that the monitoring hole deforms, the repeated usage rate of the device is increased, and the engineering cost is reduced.

The invention relates to an in-situ testing method for deep underground engineering during a rockburst preparation and evolution process. The method comprises the following steps of excavating test branch tunnels, designing and laying testing bore holes, and selecting and testing test items. In the method, before excavating the test tunnels, monitoring bore holes and a testing sensor are preset and pre-embedded respectively along the direction of the test tunnels through the test branch tunnels; by adopting the combined in-situ testing method, variation characteristics of elastic waves, cracks, deformation and energy release rate of surrounding rock at monitored section areas of the test tunnels can be directly and continuously obtained in real time and in situ; and in-situ information of the test tunnels during the whole process of rockburst preparation and evolution in the case of excavation is obtained by testing, and comprehensive precursory rockburst basic data is acquired. The in-situ testing method of the invention is concise in technical scheme and reliable in testing instrument and can ensure comprehensive acquisition and comparative analysis of rock mass information during the rockburst preparation and evolution process; and the method can be widely applied to deep underground rock excavation engineering such as an underground testing ground, water conservancy and hydropower, traffic, mine and the like.

The invention relates to the field of underground construction monitoring, and particularly relates to a real-time monitoring method for displacement of an underground deep-layer soil body. The real-time monitoring method comprises the following steps of: burying an inclination measuring pipe at the position under the surface of the existing building, distributing a plurality of inclinometer probes in the inclination measuring pipe, and connecting the plurality of inclinometer probes together by cables; then statically monitoring settlement displacement data at the position in real time by utilizing all the inclinometer probes, sending the data to a computer on the ground by a cable, carrying out data processing, and obtaining settlement information. The real-time monitoring method has the advantages that the settlement of the underground deep-layer soil body of the building along the vertical direction in construction is effectively monitored, the real-time static monitoring area is large, the accuracy of measured data is high, the labor cost for dynamic monitoring is reduced, and a solid foundation is laid for construction design, progress scheduling and avoiding measures and the like.

The invention belongs to the field of dam construction quality control of hydraulic and hydro-power engineering, and aims to provide a device which is suitable for earth-rock dam materials, realizes real-time monitoring on dam material compaction quality, remotely transmits monitoring information to a database for subsequent quality evaluation application and realizes the remote monitoring on a construction site. The technical scheme is that a real-time monitoring device of earth-rock dam material compaction quality comprises a runner wheel acceleration monitoring module, a global positioning system (GPS) positioning module and a data processing module, wherein an acceleration sensor of the runner wheel acceleration monitoring module is mounted on a part which is on a vibrating wheel of a rolling machine and which does not rotate with the vibrating wheel; and acceleration frequency spectrum data and the current sampling time are transmitted in the data processing module. The real-time monitoring device is mainly applied to the hydraulic and hydro-power engineering.

The invention relates to a protection method for controlling deformation of a building structure close to a foundation pit. The protection method comprises the following steps that (1) a soil pressure meter is buried in the side, close to the building structure, of a foundation, a foundation pit deformation inclinometer tube is buried in the side close to the foundation pit, and settlement observation points are distributed on the building structure; (2) holes are vertically drilled between the foundation pit and the building structure, air bags capable of being inflated/grouted are guided into the drilling holes through guide pipes, and the orifice sections are sealed; (3) when the foundation pit is excavated, pressurizing equipment is started according to the situations of soil pressure, surrounding ground displacement and settlement changes of the building structure, and the air bags are inflated by opening an air guide pipe so as to conduct pressure compensation on unloading caused by excavation; and (4) after excavation of the foundation pit is completed, the air bags are deflated one by one, grouting is conducted at the same time, and a pile body with certain rigidity is formed. The protection method has the advantages of being high in construction speed, high in adaptability, high in efficiency, small in disturbance, low in cost and the like, and is a very effective settlement control protection method.

The invention discloses an underwater vacuum preloading centrifugal model testing device and an underwater vacuum preloading centrifugal model testing method. The device comprises a centrifugal machine and also comprises an underwater soil body self-weight consolidation system and a vacuum driving system, wherein the underwater soil body self-weight consolidation system comprises a test model box loaded with soil body; and the vacuum driving system comprises a vacuum gas-water separation box, a vacuum aspirator pump, a rotating adapter, a high-pressure air supply device and the like. The invention can simulate soil body self-weight consolidation, namely can simulate an initial stress state of the soil body. Meanwhile, the invention adopts high-pressure air to acquire vacuum and is applied to centrifugal model testing technology, underwater vacuum preloading can be simulated, land vacuum preloading also can be simulated, vacuum preloading consolidation process and the final stress state of the consolidated soil body can be simulated, and the aim of testing underwater testing soil body displacement is fulfilled. The testing simulation can perform two-dimensional (namely a plane strain problem) or three-dimensional vacuum preloading-related simulation, and the internal stress and displacement field in a soil body consolidating area can be effectively measured.

The invention discloses a sandy soil water-immersion testing method for loess collapsible deformation. The method includes the steps: digging an exploratory well on the stratum surface, and taking collapsible loess below the exploratory well as to-be-tested soil mass; selecting a bearing plate, fixing a sedimentation rod above the bearing plate, and mounting a soil pressure gauge on the bearing plate; removing dig fictitious soil at the bottom of the exploratory well, laying a sand bed, placing the bearing plate on the sand bed, and enabling the measuring signal line of the soil pressure gauge to extend out of the stratum surface upwards; and filling sand gravels in the exploratory well, filling water after sufficient sand gravels are filled, and measuring the earth pillar pressure formed by the sand gravels by the soil pressure gauge, wherein sedimentation displacement change of the sedimentation rod refers to collapsible deformation of the collapsible loess. By the sandy soil water-immersion testing method for loess collapsible deformation, the defects of disturbance of soil sample obtaining and sample preparation on loess structuredness in indoor collapsibility tests, high on-site water-immersion test pit testing cost and limited testing points are overcome.