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1375results about "In situ soil foundation" patented technology

Monitoring method of bottom soil heave of excavation foundation pit

ActiveCN103352455AReal-time monitoring of uplift deformationArbitrarily adjust the height required for measurementIn situ soil foundationDeformation monitoringEngineering
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.
Owner:SHANGHAI URBAN CONSTRUCTION MUNICIPAL ENGINEERING (GROUP) CO LTD

Test Device for Determining Three-Dimensional Consolidation Properties of Soils

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.
Owner:GUPTA RAMESH CHANDRA

Technology for performing foundation pile quality detection and geology survey by adopting single tube longitudinal wave method

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.
Owner:陈彦平

Lower-bound limit analysis method of ultimate bearing capacity of jointed rock slope considering rock translation and rotation effects at the same time

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.
Owner:KUNMING UNIV OF SCI & TECH

Detection system for tamping settlement of heavy tamping machine

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.
Owner:DALIAN UNIV OF TECH +1

In-situ testing method for deep underground engineering during rockburst preparation and evolution process

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.
Owner:INST OF ROCK AND SOIL MECHANICS - CHINESE ACAD OF SCI

Protection method for controlling deformation of building structure close to foundation pit

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.
Owner:ZHEJIANG UNIVERSITY OF SCIENCE AND TECHNOLOGY

Underwater vacuum preloading centrifugal model testing device and 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.
Owner:CCCC FOURTH HARBOR ENG CO LTD

Sandy soil water-immersion testing method for loess collapsible deformation

InactiveCN102912780AReflect the actual collapsibilitySimple and fast operationIn situ soil foundationSoil massWater immersion
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.
Owner:XIAN UNIV OF TECH +1
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