176 results about "Saturated soils" patented technology

The invention discloses a suction accurately controlled pressure plate instrument capable of directly saturating a soil sample. The instrument mainly comprises a pressure chamber system, a suction control system, a soil sample air exhaust saturation system, a scouring system, a water quality measuring system, an automatic data acquisition system and the like, and is characterized in that a sample preparation device is tightly contacted with a clay plate through threads, so that the sealing performance of the sample preparation device and the clay plate is ensured; the changes of suction and the water content of the soil sample are monitored and controlled in real time by combining a high-accuracy electronic pressure gauge with an electronic balance; a water storage outer chamber with an upper opening is formed, and a temperature control heating rod ensures that the temperature of an inner chamber is basically constant; water is stored in the inner chamber, and filter paper is soaked in the water, so that the air humidity of the inner chamber is basically saturated; and the inner chamber is improved and matched with a vacuum pump and a water storage tank, so that a new function of performing air exhaust saturation on the soil sample is realized. A measuring result of a soil-water characteristic curve is accurate, particularly test accuracy under the condition of low suction is improved, and a measuring method is convenient.

A perimeter pile anchor foundation is built by forming a plurality of individual perimeter pile anchors in a large generally circular pattern to form a perimeter wall. The individual pile anchors are contiguous, each pile overlapping the adjacent piles on either side. The overlapping pile anchors form an arch such that compression and friction between the pile anchors resist soil caving and sloughing pressure when soil inside the perimeter wall is excavated, enabling the perimeter pile foundation to be effectively constructed in weak saturated soils and/or cohesionless sands that will not allow conventional concrete foundation excavations. A concrete foundation ring is formed inside the pile perimeter wall to support a tall and/or heavy tower or other structure subject to high upset forces.

The invention discloses a measurement device for detecting the porosity of saturated soil and an application method of the device. The measurement device comprises a cutting ring, a stainless steel electrode, a cutting ring, an organic glass box and an impedance tester. When the impedance of a soil sample is measured, the cutting ring is selected according to the property of the soil sample; the stainless steel electrode is connected with the impedance tester through a connecting wire; when the impedance of pore water is measured, the organic glass box is selected and the stainless steel electrode is connected with the impedance tester through the connecting wire; and a frequency selector and an electric level adjuster are connected with a computer through the impedance tester. The device disclosed by the invention can be used for collecting the soil sample, preparing the saturated soil sample, setting electric signal frequency and impedance testing voltage and determining the resistivity of the saturated soil and pore water; and soil properties and cementation factors are selected according to the property of the soil sample and the porosity is obtained by the computer. The measurement device disclosed by the invention has the characteristics of simplicity and feasibility, low cost, short measurement period, accurate result and the like; expensive equipment is not needed and an operation method is simple; and the measurement device can be operated in a laboratory or a filed and the practical applicability is very high.

The invention discloses a method for simulating soil slope instability induced by groundwater. The method is characterized by comprising the following steps: a, putting a physical model on a centrifugal machine; b, raising the height of an external water tank, opening a water outlet valve and a water inlet valve, carrying out water seepage into a soil layer according to the thickness of a saturated soil layer and completing the saturation process of a soil mass; c, closing the water inlet valve, reducing the height of the external water tank, improving the centrifugal acceleration to solidifyand disperse the internal pore water pressure of the physical model; d, after the solidification is finished, opening the water inlet valve, raising the height of the external water tank to the corresponding height according to the preset water level height of an internal water tank; obtaining different infiltration capacity of the water to the slope when the water in the internal water tank seepsinto the soil layer and stays at different heights, and observing the wetting front change and the slope deformation condition of the physical model. The method disclosed by the invention has the advantages that the height of the groundwater level can be accurately adjusted in real time and washing of water current to the slope body is prevented; in the whole test process, high operability, highreliability and good test effect are realized.

The invention discloses a multifunctional unsaturated soil consolidation apparatus and a test method, belonging to the field of geotechnical testing instruments. A thrust bearing, a linear bearing, a self-aligning assembly and an axial pressure sensor are arranged on a loading rod of a consolidation apparatus test platform in a built-in mode, so that the influence of friction force is eliminated during loading; and unnecessary pre-compression on a sample is reduced due to the design of a rotary rigid connection assembly, and the problem that the loading rod and the sample are eccentric due to machining and mounting is solved by virtue of the design of the self-aligning assembly. Meanwhile, according to the optimization design of the structure, the apparatus can be adaptive to multiple loading platforms, and the test can be performed on a conventional saturated soil consolidation apparatus and also can be performed on a triaxial compression tester.

The invention relates to a heavy metal polluted soil composite eluting agent, and discloses a new preparation method and an eluting method of a new eluting agent against soil polluted by heavy metals comprising lead, chromium and copper. The preparation method of the heavy metal eluting agent comprises the following steps: mixing Na2EDTA with Na3EDDS in an equimolar manner (with the respective mole concentration of 0.1 M) to form a composite eluting solution, and adjusting the pH value of the composite eluting solution to 10 by using 0.1 M of an NaOH solution. The eluting method comprises the following steps: moistening a saturated soil sample with re-distilled water, and eluting the saturated soil sample with the composite eluting agent according to a uniform flow velocity of about 1 mL.min<-1>, wherein the use amount of the eluting solution is 6 times the aperture volume of the soil. The composite eluting agent allows the lead eluting removal rate to be 76%, the chromium eluting removal rate to be 48% and the copper eluting removal rate to be 86%, and has obvious better effects than single eluting agents.

A method is provided for determining the depth to the saturated soil at a selected site. A first and second instance wherein the depth of the water table equals the depth to the saturated soil is identified (142). The rate of change of the depth to the saturated soil is calculated (146) as a function of the specific yield, amount of time between the instances, total precipitation occurring between the instances, and depth of the water table at each instance. Then, the depth to the saturated soil for a third instance is calculated (148) as a function of the rate of change of the depth to the saturated soil. The calculated depth to the saturated soil for a third instance may be adjusted as a function of precipitation occurring at the site.

The invention discloses an automatic unsaturated soil water infiltration measuring system and an automatic unsaturated soil water infiltration measuring method based on Internet of Things. The automatic unsaturated soil water infiltration measuring system comprises a Markov bottle, an elevator, a soil column, a gravity sensor, a moisture sensor, a counter, a data acquisition and transmission device, terminal equipment and the like. Based on the Internet of Things, automatic start and stop of an experiment, as well as automatic recording, transmission and real-time viewing of experimental data are achieved, so that the experimental workload is greatly reduced. The automatic soil water infiltration measuring system is complete in function and convenient to mount and use, can achieve a water infiltration process experiment under the conditions of different solution concentrations, different initial soil moisture contents, different soil bulk densities and different infiltration heads, has the advantages of automation, high efficiency, real-time performance, economy, reliability and the like, and is applicable to layered soil and homogeneous soil.

The invention discloses a temperature-controlled permeameter and an experimental method thereof, related to geotechnical testing technology in the field of geotechnical engineering. The temperature-controlled permeameter includes an object to be tested, that is, a sample (00); the temperature-controlled permeameter is provided with a temperature control device (10), a permeating device (20) and ameasuring device (30); the sample (00) is placed in the permeating device (20); the permeating device (20) is placed in the temperature control device (10); and the measuring device (30) is connectedto the permeating device (20) to measure a seepage flow. The experimental method of the temperature-controlled permeameter comprises the following steps of: (1) loading the sample; (2) controlling temperature; and (3) measuring a permeability coefficient. Compared with the prior art, the invention adopts a temperature control device to realize temperature control, which can be used for studying the influence of temperature on the permeability of saturated soil; the measuring device uses data acquisition, which greatly reduces manpower and improves the test accuracy; the operation is easy, theinstallation and testing are convenient, and the practicability is good; and the temperature-controlled permeameter is suitable for saturated soil test under temperature control conditions.

The present invention belongs to the foundation ground treatment technical field, in particular to a heavy tamping semi replacement construction process, which solves the problem of the prior art that the heavy tamping method is not suitable for treating the high saturation general clay foundation and the collapsible loess foundation. The heavy tamping semi replacement construction process has the following steps that: firstly, an under layer is laid, and then is tamped 2 to 3 times with a rammer, in the process of tamping, filling material is added into a tamping pit to form a macadam pier, and the length of the macadam pier is less than the thickness of soft soil. The present invention effectively solves the problems that the effect is not good when the general clay foundation and the collapsible loess foundation adopt the direct tamping method, and the construction is complex and the cost is high when the heavy tamping replacement method is adopted. The climate in our country is humid and has a lot of rain, and the foundation treatment market is wide in the south area widely distributed with the general clay and the high-saturated soil, and the present invention has good application prospect.

The invention provides a calculating method for a heat conductivity coefficient of soil mass minerals. The method comprises steps as follows: measuring relative density of soil mass and calculating the maximum dry density rho(d-max) of the soil mass; making saturated soil samples with dry densities being rhod1 and rhod2 respectively and measuring heat conductivity coefficients of the saturated soil samples; calculating volume Vs of the soil mass minerals in the saturated soil samples and volume Vw of water in the soil mass minerals; calculating heat conductivity coefficients of the soil mass minerals in the saturated soil samples with dry densities being rhod1 and rhod2 respectively; calculating the heat conductivity coefficient ks of the soil mass minerals. The calculating method has the effects as follows: the method has the characteristics of being direct, realizing convenient calculation and the like, and a means is provided for calculation of the heat conductivity coefficient of the soil mass minerals. On the basis of contrastive analysis for the relative error, the forecast error of the calculating method is within 4.46%. By means of improvement of precision, calculation precision of the heat conductivity coefficient of the soil mass minerals can be improved to the greatest extent, and convenience is brought to establishment of a forecasting method of the heat conductivity coefficient of the soil mass.

A device for remediating rocks environmental pollution by a nanotechnology and an application thereof are disclosed. A pumping well is arranged 5-10m away from a water injection well along the flowing direction of subsurface flow. A filter screen is arranged in both the water injection well and the pumping well. A nanobubble saturated solution injection assembly is arranged on the ground between the water injection well and the pumping well. The nanobubble saturated solution injection assembly is respectively connected with the water injection well and the pumping well through pipelines. Through a nanobubble saturated solution, rocks environmental pollution is processed. The device provided by the invention has advantages of low cost, good remediation effect and high remediation efficiency. In addition, processing is thorough and secondary pollution is not caused; organic pollutants and heavy metal pollutants in underground water and saturated soil areas below the underground water can be removed effectively; and only by arranging corresponding numbers of the water injection wells and the pumping wells with cooperation of one or more sets of equipment, the device can be applied in the field of pollution treatment of rock soil and underground water with different pollution sources, different pollution areas, different pollution degrees and different pollution depths.

The invention discloses an improved design method of a thermal conductivity model based on soil physical basic parameters, which is carried out according to the following steps: firstly, a new model is created based on each physical basic parameter affecting soil thermal conductivity lambda; then the thermal conductivity Lambda dry of dry soil and Lambda sat of saturated soil in the new model arecalculated, and N kinds of mineral soils are selected from M kinds of soil samples for fitting, and the optimum shape factors alpha and beta of N kinds of soils are obtained, among which, M>15, N>8; finally, through the multivariate linear combination, the matrix is listed, the multivariate linear equation is solved, the influence parameters of each influence factor in the new model are obtained,and the final model is obtained. The invention solves the problems that the model parameters in the prior art are difficult to determine, the error is large, and the factors involved are not comprehensive enough.

The invention provides a remediation agent for cadmium contaminated soil and a soil remediation method. The remediation agent comprises magnesium oxide, sepiolite, magnesium calcium-based bentonite, and zeolite, and can be used for in-situ remediation performed on the cadmium contaminated soil. The remediation agent takes magnesium oxide as a main passivator component for cadmium, additional threeclay minerals are added to serve as adsorbent and stabilizer components to form a mixture, after the remediation agent and the contaminated soil are uniformly mixed, the initial water content is adjusted to a saturated soil water content, and the remediation agent is left to stand for 3 to 10 days, so that normal plant seeding can be performed. The remediation agent reduces the bioavailability and transferability of heavy metal elements in the cadmium contaminated soil, improves soil self-purification capacity, and improves the soil fertility status, thereby guaranteeing the high quality, high yield and safety of agricultural products, ensures that the soil remediation is short in reaction period, good in effect, long in duration and wide in application range, and cannot cause secondary pollution.

The invention relates to a brand-new method and a measuring device for a soil moisture characteristic curve, which can measure the moisture characteristic curve in a soil moisture absorption process. The method utilizes a water pulverization theory to generate a humidification condition through uniform water vapor so as to measure parameters (numerical values of pressure and water content) in the soil moisture absorption process. The measuring device comprises a pressure device, an ultrasonic atomizer and a uniform humidifying device, wherein the pressure device is used for quantitatively controlling and measuring the pressure variance of a soil moisture absorption curve process, namely soil water potential variance; the ultrasonic atomizer is used for generating ultramicro water particles of 1 micrometer to 5 micrometers, and the uniform humidifying device realizes the uniform moisture absorption of test soil samples under a set pressure condition and can ensure that no partial saturated soil water flow phenomenon can occur in the moisture absorption process. The invention provides necessary scientific bases for researching soil water moving characteristics and tri-water transformational relation in a water circulating process, agricultural scientific irrigation and crop growth.

The invention discloses a multifunctional stimulating device for soil vibrating and liquefying as well as pile foundation liquefying resisting functions. The stimulating device comprises a sand box stimulating device part, a telescopic pile foundation stimulating and controlling device part, different vibrating load loading device parts and a movable type pore water increasing-reducing device part. The movable type pore water increasing device controls saturation degree of water-containing sandy soil in the sand box through a water adding or reducing way, different vibrating load loading devices can apply different types of vibrating load, and vibrating and liquefying phenomena under different saturation degrees and different vibrating load of the water-containing sandy soil can be observed. The length of a variable pile foundation buried in the water-containing sandy soil is controlled, so that a tilting condition of a short pile foundation while the saturated soil is liquefied, and action, in resisting soil liquefying, of the long pile foundation can be observed. The device has the advantages of being multifunctional, easy to operate, repeatable, and visual in display, and is suitable for displaying the soil vibrating and liquefying as well as pile foundation liquefying resisting functions in the civil engineering field.

The invention relates to a layered saturated soil seepage consolidation simulating device which comprises a container device, a spring-piston device, a loading device, a water supply and discharge device and a measuring device. The container device comprises a water container (1) and a collection container (2) which are connected through the water supply and discharge device, the spring-piston device is arranged inside the water container (1) and used for simulating a layered soil body, the loading device is fixed at the top of the spring-piston device and applies a load to the spring-piston device, the water supply and discharge device is arranged on the loading device, and the measuring device is arranged on the side wall of the water container and used for measuring static water pressure. Compared with the prior art, the layered saturated soil seepage consolidation simulating device has the advantages that the simulating device is simple and convenient in connection and can simulate soil frameworks and void ratios of the layered soil different in elasticity modulus, experiments are close to real environment, and the layered saturated soil seepage consolidation simulating device has good effect on helping in understanding a Terzaghi one-dimensional consolidation theory.

The invention provides a thermal consolidation tester for internal heating of saturated soil and a test method thereof. The thermal consolidation tester comprises a modified triaxial pressure chamber,a sample barrel which can realize internal heating, a temperature controller and an ultrasonic processor, wherein the sample barrel is wrapped by a layer of a rubber film; a small heating particle isembedded in sample soil and is connected with a temperature sensor mounted on the upper part of the top cover of the pressure chamber through a thin wire which has passed through water permeable stone and a sample cap; two arc heating plates symmetrically wrap the inner sides of the side wall of the pressure chamber, and space between the two arc heating plates and the inner sides is filled withheat-insulating asbestos; one end of the temperature sensor passes through a pressure chamber barrel, and the other end of the temperature sensor is connected with the temperature controller through awire; and the ultrasonic processor is composed of an ultrasonic transmitting device, an ultrasonic receiving device and an ultrasonic processing device arranged at two sides of the side wall of the pressure chamber. The test method can quickly heat soil, realizes uniform external heating temperature of the soil and heating of interior local parts of soil, and analyzes the influence of ambient temperature on the displacement and temperature of the soil.

The invention discloses a multi-split remodeling saturated soil sampling device which relates to the field of soil tests of civil engineering. The structure of the multi-split remodeling saturated soil sampling device is mainly as follows: sample preparation devices are arranged on an iron frame; one end of a steel wire rope is fixed on a left cross rod; the other end of the steel wire rope sequentially penetrates through the iron frame and fixed pulleys of the sample preparation devices and then is connected with the middle end of a long rod, a weight is loaded on a hook, and the hook is connected with the left end of the long rod, so that a structure for performing loading and force transferring on each sample preparation device is formed; a base, a lower water penetrating stone, a soil sample, an upper water penetrating stone, a cover plate, a vertical rod and the cross rod in each sample preparation device are sequentially connected from bottom to top in a sample preparation cylinder so that a structure for a soil sample test is formed. According to the multi-split remodeling saturated soil sampling device, a vertical pressure is applied to thin mud in each sample preparation device by using a lever principle and fixed pulley blocks, the testing time is saved for the soil test with multiple variables and long sample preparation period; one set of loading system is only required, the cost is effectively cost, and a relatively good economic practicability is achieved.

The invention discloses a floating pile longitudinal vibration analysis method based on layered saturated virtual soil pile. The virtual soil pile under the solid pile is introduced, and by assuming that the virtual soil pile, the solid piles, and the characteristics of the surrounding soil and the subsoil around them, the saturated virtual soil pile model is adopted, thereby considering the saturation characteristics of the soil around the pile and at the bottom of the pile, and being able to reasonably consider the influence of the thickness of pile foundation soil and other factors on the longitudinal vibration characteristics of pile foundation. The method can be used to study the longitudinal vibration characteristics of floating piles in saturated soils. The three-dimensional saturated soil model can consider the three-dimensional wave effect around piles and the soil under piles, and the longitudinal stratification can consider the stratification characteristics formed by the natural sedimentation of soil, which can provide theoretical guidance and reference for the dynamic testing of piles.

The invention provides a method for studying longitudinal vibration of a pile foundation in saturated layered soil based on a virtual soil pile model. A longitudinal vibration dynamic impedance arithmetic system of float bearing pile base on saturated virtual soil pile model The saturated virtual soil pile model can take into account the saturated characteristics of pile circumference and pile bottom soil, and can reasonably consider the influence of pile bottom soil thickness on pile foundation longitudinal vibration characteristics, which is suitable for the study of floating pile longitudinal vibration characteristics in saturated soil, and can provide theoretical guidance and reference for pile foundation dynamic testing.