181 results about "Soil strength" patented technology

A tunnel ground deep-hole sleeve valve tube grouting construction method is used for treating an operating tunnel and is characterized in that first a construction joint in the tunnel is treated and a polyurethane waterproof material is adopted; then a bore with a certain depth is constructed at an angle in strata, a sleeve valve tube is arranged, a casing material is pre-poured, the sleeve valve tube stays in soil permanently, grout outlet holes are reserved in the grouted sleeve valve tube at intervals, a water-injection rubber hole packer is placed in the sleeve valve tube, and a stop valve is additionally arranged at a grout inlet; during grouting, water is injected into the water-injection rubber hole packer to block a grouting tube, and a to-be-grouted part is grouted by a retreating grouting method; and finally, the grouting effect is checked, and grouting is performed repeatedly if the effect is bad. The tunnel ground deep-hole sleeve valve tube grouting construction method has the advantages as follows: the working efficiency is increased; and the method is implemented in combination with in-tunnel grouting blockage, thus improving and radically changing the physical and mechanical properties of a foundation and a load-bearing action mechanism, increasing soil strength, reducing deformation and achieving the purposes of reinforcing soil and blocking water gaps.

The invention relates to a method of, and system (200) for, obtaining an indication of the soil strength of soil (100) over which a compactor roller (10) travels. The method includes determining the depth to which a drum (14) of the compactor roller (10) penetrates into and depresses the soil (100) when the compactor roller (10) travels over a soil surface. The system (200) includes a compactor roller (10), a measuring arrangement (40) and a processor (50) which is operatively connected to the measuring arrangement (40) and which is configured to process data received from the measuring arrangement (40). The measuring arrangement (40) includes an inertia! measurement unit (70, 72, 74) which is operatively connected to the compactor roller (10), wherein the arrangement (40) is configured to obtain an indication of the soil strength of soil (100) over which the compactor roller (10) travels during operation, by determining the depth to which the drum (14) penetrates into and depresses the soil (100) over which it travels.

The invention relates to a soft foundation discharge fixing technique, used to quickly fix and strengthen soft foundation. The invention combines high-pressure tube device and upright discharge device, to force high pressure on the high-pressure tube, to repeatedly expand the high-pressure tube to sideward press soil, to quickly solidify the soil step from step, and improve the soil strength, to strength the foundation. The strengthen depth of foundation is not limited by soil saturated degree, to confirm the strength quality. The time cost by the invention is 1 / 4-1 / 2 of traditional discharge strengthen method, while its cost is 50-70% of traditional discharge strengthen method, with simple operation, non additional construction field, and repeated used tools, non pollution and waste, and significant economic and social benefits.

The invention discloses a method for treating a deep soft soil foundation by combining a chemical electro-osmosis method and a vacuum preloading method. In the method, vertical porous drain pipes and metal electrodes are inserted and chemical solution is injected into the soft soil foundation, horizontal drain boards and seal geomembranes are laid on the top of a soil layer, direct current is supplied, vacuumization is carried out, and under the action of direct-current electric field force, water with positive charge and cation solution flow to a cathode and anion solution with negative charge flows to an anode to form electro-osmosis and chemical reaction; meanwhile, under the action of internal and external pressure difference formed through vacuumization, water is quickly discharged from the drain pipe in which the cathode is positioned; and the solidification and compactness of the foundation soil are accelerated and the soil strength of the soil is improved. Compared with the common vacuum preloading method, the method has the advantages that: the soft soil treatment depth is increased, the deep layer of the soil of which the vacuum degree is difficult to reduced can be reached, and under the action of the direct-current electric field force, the solidification rate of the soil is improved and the construction period is shortened. Through the method, the construction process is simple, the operability is high, the construction period is short, the quality control and detection are facilitated, and the soil strength is improved obviously.

A system and method for characterizing soil shear strength from a vehicle, comprises a plurality of sensors mounted on a vehicle and configured to measure distances from the sensors to the soil surface. The sensors comprise a first sensor disposed on the vehicle and configured to measure a first distance between the first sensor and the soil and a second sensor disposed on the vehicle and configure to measure a second distance between a the sensor and a track made in the soil by the vehicle, wherein the first sensor measures the distance at a location before the vehicle wheel travels over that location and the second sensor measures the distance to the bottom of the track made by the wheel. A processing module is communicatively coupled to the sensors and is configured to calculate track depth as a function of the first and second distance measurements; and to derive soil shear strength as a function of the calculated track depth and the vehicle parameters.

The invention relates to a soil strength test board for a wheel. The soil strength test board for the wheel comprises a test board bracket, a wheel and a soil groove body which interacts with the wheel, the soil groove body is arranged at the lower part of the inside of the test board bracket, and the wheel is located at the upper surface of the soil groove body in a rolling press mode; the wheel is connected below a variable load mechanism through a steering mechanism, and the variable load mechanism is connected with a driven wheel drive mechanism through vertical and horizontal moving mechanisms so as to be movably hanged on two upper beams of the test board bracket; the rotating shaft of the wheel is directly connected with an active wheel drive mechanism. The soil strength test board for the wheel can use a counterweight block to change the weight of the soil strength test board for the wheel under an offline state so as to simulate the acting force between the wheel and the ground under different vehicle weights; a slider-crank mechanism changes the distance between two isotropic magnets so as to change the repulsive force there-between to simulate the online real-time vertical load change of the wheel of an air cushion vehicle; the active wheel drive mechanism and the driven wheel drive mechanism simulate the active movement form and driven movement form of the wheel.

The invention discloses a method for treating a soft foundation with an electroosmosis soil pile based on a tubular EKG electrode. The method comprises the steps of electrode arrangement, pipeline arrangement, electrode electrification, drainage and the like; the tubular EKG electrode is arranged in the soft soil foundation; sub-outer ring electrodes and outer ring electrodes are formed by taking the electrode as a center; and the electroosmosis drainage is performed for twice in sequence from the inside out. After electroosmosis completion, the soil strength in a sub-outer ring is improved to form an electroosmosis soil pile. The method is simple in construction technology and obvious in economic benefit, the electroosmosis soil pile formed after the electroosmosis can exert an effect of a pile foundation, and the method is suitable for reinforcement of the soft soil foundation.

The invention discloses a swelling soil humidifying and swelling numerical simulation method under the rainfall infiltration condition. The swelling soil humidifying and swelling numerical simulation method comprises the following steps: adopting a fluid-solid coupling module and compiling a relevant FISH language program, and realizing the relation of change of the non-saturated region matrix suction, the non-saturated permeability coefficient and the soil strength parameter along with the moisture content in the unsaturated seepage process; then based on the 'humidity stress field theory', according to the similarity of a seepage continuity differential equation and a heat conduction equation, deducing the equivalent conversion relation of a thermodynamic parameter and a seepage parameter, and adopting a thermodynamic module to realize swelling soil swelling deformation process under the humidifying condition. According to the swelling soil humidifying and swelling numerical simulation method, the swelling soil humidifying and swelling whole-process numerical calculation under the rainfall infiltration condition can be effectively and comprehensively realized, so that effective scientific guidance means are provided for engineering design and construction in the high-risk area of the swelling soil engineering disaster, and meanwhile application of the computational soil mechanics to the technical fields of practical engineering construction, geological disaster prevention and control, and the like, is powerfully driven.

The invention discloses a test device for rapidly testing soil strength and permeability coefficient by simulating a freeze-thaw cycle, and relates to the technical field of soil mechanics and geotechnical engineering. The test device comprises a box body and a sample box, wherein the sample box is arranged inside the box body; and the test device further comprises a measurement system used for measuring various physical and mechanical parameters of soil, a freeze-thaw cycle system used for providing temperature control for a freeze-thaw process of a soil sample, and a displacement control system used for horizontal and vertical precise movement of each sensor. The test device has the benefits that a micro-static probe can measure the penetration resistance of a soil taper tip, and a crossshear plate can measure the undrained shear strength and shear modulus of the soil sample; and by analyzing the relationship between the undrained shear strength and the shear modulus of a specific soft soil sample through tests, the most simple and feasible solution for calculating the shear strength of the on-site soil by a static penetration test can be provided.

The present invention relates to the automatic monitoring method for cement-soil stirring pile construction. The present invention has headway, flow rate, density and rotation sensors the collect signals, transmits the signals via antenna or copies the signals via movable memory to computer, and records and processes the signals and data in the computer with proper software. The present invention is one kind of positive real-time dynamic monitoring method and may be used in continuous monitoring of pile construction and real-time analysis of foundation soil strength and other characteristics to avoid artificial engineering quality problem. The monitoring apparatus has small size, convenient carrying about and simple use.

The present invention relates to in-place soil stabilization. Specifically, the present invention relates a method and device for measuring the increase in subsurface earth pressure during the injection of a stabilizing agent into the soil. The rise in sensor pressure indicates an increase in soil strength and bearing capacity. Therefore, real-time monitoring of these pressures may serve as a guide during the injection process.

The invention relates to the field of soil testing instruments, in particular to an indoor cement soil stirring device. The indoor cement soil stirring device comprises a motor, a stirring shaft, a liquid charging pump, a test box and a lifting bracket for supporting both the motor and the stirring shaft, wherein the stirring shaft comprises a rotating part and a stirring part, and one end of the rotating part and one end of the stirring part are in detachable connection; a curing agent channel is arranged in the rotating part, as well as the stirring part; one end of the rotating part is in rotational connection with the lifting bracket and communicated with the liquid charging pump; a stirring blade and a stock outlet are arranged at the other end of the stirring part and the stock outlet is communicated with the curing agent channel; the motor comprises a power output shaft in transmission connection with the rotating part. According to the invention, a tester can replace stirring blades of different models through replacing the stirring part, so that the stirring blade suitable for soil to be cured can be accurately tested, and further, the cement soil strength is improved.

The invention relates to a slurry injection technique of a sleeve valve tube of a cloth bag, which is developed on the basis of a regular slurry injection technique for the sleeve valve tube and has the characteristics that the cloth bag having the same length as the sleeve valve tube is sleeved on the sleeve valve tube; one to two plastic drainage plates are fixed outside the cloth bag in the depth direction; sleeve shell material is injected into the cloth bag after the sleeve valve tube with the cloth bag and the plastic drainage plates is inserted into drilling holes and then constructingis carried out according to a regular slurry injection method of the sleeve valve tube. The technique can avoid slurry leaking and flowing phenomena and is beneficial to forming a column body. The plastic drainage plates are arranged, thereby quickly discharging partial water in slurry liquid, dissipating the super-static pore water pressure of injection slurry in a foundation, effectively reducing the soil squeezing effect and increasing the foundation soil strength.

The invention relates to a safe construction method applied to strong structure soft soil by a preloading method in the technical field of constructional engineering. The method includes the steps: firstly, first stage geological survey including the operations of classifying soil horizons, finding out the position of a permeable layer, the type of groundwater and the state of water source supplement, setting soil parameters by geotechnical tests and making a summary listing of result of geotechnical tests; secondly, the construction of plastic water discharge plates and sand cushion layers of the first stage; thirdly, middle stage geological survey determining the disturbing degree of the construction of the plastic water discharge plates of the first stage on lower soil; fourthly, confirmation of construction parameters settling the schedule of later stage embankment preloading according to the relationship of the increase of soil strength and the degree of consolidation; and fifthly, execution of construction of embankment preloading according to the construction schedule determined in the fourth step, and finally road surface pavement is carried out, thereby accomplishing the entire embankment construction. The method of the invention is simple, the security of the construction can be greatly increased, and the time limit for a project can be shortened to the utmost extent.

The invention discloses a shear ring diameter adjustable unsaturated-soil direct shear instrument testing device which comprises an upper shear box and a lower shear body. Each of the upper and lower shear boxes comprises a circular telescopic steel sheet, steel sheet abutted plates and an outer shear shell; the outer shear shell is of a equilateral triangle, the middle portion of each edge of the triangle is connected with one steel sheet abutted plate, the steel sheet abutted plates have the circular telescopic steel sheet fixed respectively in three directions, and the upper and lower shear boxes are fixedly connected through bolts. By the arrangement, the problem that soil desiccation cannot be attached to the inner wall of the shear box can be solved, precision in unsaturated-soil strength test is improved, and the testing device is easy and light in design, convenient in operation, good in integrated performance and wide in application.

The invention discloses an inverse analysis method for determining pile foundation and pile soil strength parameters and belongs to the technical field of civil engineering. The method includes a pile side soil strength parameter inverse analysis method and a pile end soil strength parameter inverse analysis method, namely a determining method of the pile side soil and pile end soil elastic mechanics solution, a pile side soil stress transmission attenuation coefficient, the principal stress difference saltation principle for determining the pile side soil limit equilibrium state position and a stress path saltation point, an Mohr stress circle graphic method for determining the pile side soil strength parameter and an Mohr stress circle graphic method for determining the pile end soil strength parameter. The inverse analysis method is established on the basis of the elastic theory, the rock and soil mechanics theory and the saltation theory, the acquired strength parameters are closer to the objective situation, the method has higher applicability, and the errors caused by test contingency factors are reduced.

The invention discloses a slope strengthening method based on plant urease reinforcing liquid. Grouting treatment is carried out on the interior of a slope through the plant urease reinforcing liquid,and spraying treatment is carried out on the surface layer of the slope. The plant urease reinforcing liquid is prepared from bean flour rich in urease, processing powder and water, and constituentsof the processing powder include urea and calcium salt, wherein the mass ratio of the bean powder to the processing powder is 1:1-1:2, and the mass ratio of the bean powder to the water is 1:10-1:20.The plant urease reinforcing liquid obtained by adding the water into the bean powder and the processing powder is fed into the slope and sprayed onto the surface of the slope, crystallization of calcite is promoted through carbonate generated in a urea hydrolysis reaction and the rising of ph in the reaction process, low-carbon and environment-friendly crystal matter high in strength and adhesivestrength is formed and is filled and adhered among soil particles of the slope, the soil strength can be remarkably improved, the effect that the slope is strengthened is achieved, and the overall stability of the slope is improved.

The invention relates to an alkaline chromium-contaminated soil solidifying, stabilizing and repairing method, and belongs to the technical field of environmental engineering. Hexavalent chromium in chromium-contaminated soil is separated into water by adopting water-washing pretreatment; hexavalent chromium-contaminated water is adjusted to be acid by adopting sulfuric acid as an acidifying or alkalizing agent, therefore, a reduction reaction of hexavalent chromium is facilitated, sulfuric acid can participate in a later curing reaction, and high-valued application of sulfuric acid is achieved; the efficiency of reducing hexavalent chromium in the contaminated water into trivalent chromium is improved by adopting CaS5 as a reducing agent, and water-washed soil and water after the reduction treatment are mixed for solidification and stabilization treatment; resource utilization of blast furnace slag is achieved by adopting the blast furnace slag and active magnesium oxide as solidification materials, enhancing of the strength of the solidified soil and wrapping of contaminants can be quickly achieved, and the long-term stability of the treated chromium-contaminated soil is good. The method has the advantages of being low in treatment cost, good in effect, free of secondary pollution, convenient to operate, good in long-term stability, high in resource utilization and the like.

The present invention relates to a method of manufacturing soil reinforced by microbe-based bio-binders and soil produced by the method. The bio-binders are not harmful to humans, do not cause environmental pollution and secure sufficiently the soil strength and resistance against wind. According to the method, the soil is prepared by binding sand whose major components are silica and alumina, ureolytic microbes, urea, calcium ion, and polymer fibers, and the content of polymer fibers in sand ranges from 0.05 wt % to 5 wt %. In addition, it is preferable that the microbes provide CaCO3 at a rate at 1˜7×10−9 g CaCO3 ppt cell−1 hr−1 under optimum conditions.

The invention relates to a dangerous condition early warning and forecasting method for pipe jacking downward penetrating process of an existing box culvert. The method comprises the steps that 1, multiple characteristic parameter data of the existing box culvert and the surrounding soil bodies of the existing box culvert are collected through a monitoring device; 2, format processing is conductedon the collected data; 3, the soil strength in a disturbance zone is obtained through inversion by using a dichotomous displacement ratio method; 4, multiple characteristic parameters, the weight ofthe soil strength of the disturbance zone affecting culvert safety coefficients and gray relational grade are obtained through a hierarchical analysis gray relational grade method; 5, a long and shortterm memory circulation neural network model is established to predict the destruction occurring time of the existing box culvert; 6, a Kalman filtering method is adopted to predict the destruction occurring time of the existing box culvert; 7, prediction results of step 5 and step 6 are combined to conduct early warning and forecasting on dangerous conditions before the critical destruction occurring prediction time. Compared with the prior art, the method can more reasonably perform quantification early warning and forecasting on the dangerous condition for pipe jacking downward penetratingof the existing box culvert in a manner which is more closer to actual conditions.

The invention relates to a solidifying agent capable of solidifying and stabilizing soil with poor mechanical properties, in particular to an early-strength solidifying agent and a manufacturing method and application for the same. The early-strength solidifying agent is capable of quickly improving the strength of soil and comprises phosphate and overburnt magnesium oxide. A ratio of the quantity of magnesium substances in the overburnt magnesium oxide to the quantity of phosphorus substances in the phosphate is 0.85-4. Proportion quantities of raw materials are uniformly stirred during usage, so that the powdery solidifying agent is formed. The soil solidifying agent not only can be applied to soil polluted by heavy metal, but also can be applied to dredging silt. The soil solidifying agent, the manufacturing method and the application have the advantages that the early strength of the soil can be quickly improved, the permeability is degraded, the pH (potential of hydrogen) can be regulated, and a suitable solidifying and stabilizing environment is created for the heavy metal.

The invention relates to a combined soil nailing construction method, which belongs to the field of geotechnical engineering, and includes the steps as follows: step 1, preliminary grouting is vertically performed at the top of a slope; step 2, earth is excavated to form a sloping surface, and bottom layer concrete is sprayed on the sloping surface; step 3, injected holes are distributed in a concrete surface formed in the step 2 and holes are drilled, wherein drill stems of drilling tools are steel pipes, and the steel pipes are left in the holes to serve as grouting pipes after the holes are formed; step 4, the grouting pipes are grouted, then rigid rod pieces are inserted in the pipes to form combined soil nails; step 5, panel tie pieces are placed on the sloping surface, and are enabled to be jointed with exposed heads of the rigid rod pieces in the step 4; and step 6, surface layer concrete is sprayed on the panel tie pieces, and the construction is completed. The method provided by the invention solves the supporting problem of soil layers with poor soil strength, and has the advantages of low construction cost and short construction period.

The present invention relates to a method of manufacturing soil reinforced by microbe-based bio-binders and soil produced by the method. The bio-binders are not harmful to humans, do not cause environmental pollution and secure sufficiently the soil strength and resistance against wind. According to the method, the soil is prepared by binding sand whose major components are silica and alumina, ureolytic microbes, urea, calcium ion, and polymer fibers, and the content of polymer fibers in sand ranges from 0.05 wt % to 5 wt %. In addition, it is preferable that the microbes provide CaCO3 at a rate at 1˜7×10−9 g CaCO3 ppt cell−1 hr−1 under optimum conditions.

The invention discloses a method for strengthening a subgrade basement of an existing high speed railway line. The method comprises the steps of 1, performing construction operation of a temporary shaft on the side of a high railway speed line; 2, constructing vertical isolation piles between a cross passageway and the existing high speed railway line, performing construction operation of the cross passageway by starting from the interior of the temporary shaft in the direction of the high speed railway line, and the temporary shaft and the cross passageway forming a construction passageway; 3, performing operation of a ramming pipe curtain by starting from the interior of the cross passageway in the direction of the subgrade basement; 4, performing operation of grouting a sleeve valve tube; and 5, backfilling the temporary shaft and the cross passageway. According to the invention, the soft foundation of the existing line is strengthened to the maximum, the physical and mechanical properties and the load bearing capacity of the subgrade ca be improved, the soil strength is improved, the soil deformation is decreased, and the purpose of strengthening soil is realized. Furthermore, the method is safe and reliable in construction, the phenomena of subsidence and collapse during construction are completely avoided, and the railway construction and operation safety are protected.

The invention discloses a shearing device for testing soil strength. Aiming at solving the problems of trueness and accuracy existing in the measured value of a straight shearing device or a single shearing device, the shearing device for testing soil strength comprises an upper shearing box and a lower shearing box, wherein a shearing sliding part is arranged between the lower shearing box and the upper shearing box; the lower shearing box is provided with a constraint component for constraining the upper shearing box during shearing; the shearing sliding part comprises a grooved track bar and a plurality of shearing overlaid rings of which parts are arranged in a track inner groove of the grooved track bar; and the upper shearing box, the lower shearing box and the shearing overlaid rings are provided with packing barrels for accommodating test samples. Due to the adoption of the shearing device, the technical defects of the straight shearing device and the single shearing device adopted in the current shearing test are overcome, and the trueness and accuracy of a test result are further ensured.

A light-weight electronically-controlled hammering module is used to apply a repetitive hammering force under electronic control to the top end of a dynamic cone penetrometer rod. In a preferred embodiment, the hammering module has a battery-powered percussive hammer that applies an electrically-generated impulse hammering force to the top of the rod. The depth of penetration is measured with a range-finder and used to compute the rate of penetration of the rod into the ground and correlated to the strength of the soil. The rate of hammering is controlled to cause the rod to penetrate into the soil at a controlled rate correlated with the strength of the soil.

The invention discloses a modular soil compaction molding device applicable for treatment of deep and shallow soft soil foundations. The modular soil compaction molding device comprise an upper frame,a compaction molding module and a soil strength detection device, and is characterized in that the compaction molding module comprises a plurality of convex bodies; the top of the module is connectedto the upper frame, and the part, coming into contact with soil, of the compaction molding module is further provided with a filter device; and the bottom of the compaction molding module is furtherprovided with a vertical pile body. The soil is blocked by the convex bodies at the bottom of the compaction molding module, and prevented from offsetting so that the soil is centralized in spaces among the convex bodies and extruded fully, and the effects of quick drainage and compaction are achieved. Moisture extruded from the soil is discharged through the filter device, and the construction efficiency is improved greatly; and the construction period is shortened, and the construction cost is reduced.

The invention discloses an in-situ soil exploration device and an in-situ soil exploration method. The in-situ soil exploration device comprises a hollow rod member, and the bottom end of the hollow rod member is fixedly provided with a cone probe. The hollow rod member and the side wall of the cone probe are provided with soil pressure meters and pore water pressure meters, the bottom point of the cone probe is provided with a water inlet / outlet, and the water inlet / outlet is hermetically connected with a water pipe line which penetrates outside the top end of the hollow rod member. The in-situ soil exploration method comprises firstly pressing the exploration device in soil at a certain speed and acquiring sensor data; opening a water pump, sinking the exploration device at the identical speed and acquiring the sensor data again; and computing out the sinking resistance of self-weight sinkage and suction-force sinkage respectively. According to the in-situ soil exploration device and the in-situ soil exploration method, the disturbance process that the soil bears during a suction-type foundation sinkage process is simulated, the affection of the suction-type foundation sinkage construction process on soil strength is taken into consideration, and the detected soil-end resistance and the detected side form resistance can reflect the sinkage resistance of a suction-type foundation in a special construction process more accurately.

The invention provides a probe testing device and method which are applicable to strength and structure testing of super-solidified and heterogeneous soil. The probe testing device comprises a probe fixing frame, a tension-compression stress sensor, a displacement meter, a probe and a laterally constrained columnar hard soil specimen provided with a specimen protective cap above; test conditions of penetration resistance distribution on multiple penetration traces of an axis of the columnar specimen are provided. Penetration resistance distribution on multiple penetration trances and hard soil weak zone division on each single penetration trace are obtained through repeated tests through probes with different diameters, accordingly, the spatial three-dimensional morphology of weak zones is obtained, hard soil strength features are calculated and analyzed according to spatial distribution data of the penetration resistance of the hard soil, the structure of an existing press machine remains unchanged, the testing device is convenient to disassemble and assemble and simple in structure, and acquired data are detailed and reliable; the probe testing device can adapt to multiple size tests and various kinds of hard soil by adjusting the dimension of the probe, the size of a ring knife and the size of the specimen protective cap and has wide adaptability.

The invention discloses a cement paste concentration real-time regulation and control device for a cement-soil mixing pile and a use method of the cement paste concentration real-time regulation and control device. The device comprises a paste feeding pump, a three-way joint, a variable frequency water pump, a paste feeding hose, a cement-soil mixing pile machine, a monitoring host, a pile machinecontrol cabinet and a current sensor. The method comprises the following steps: analyzing and summarizing a corresponding relation between current and soil layers according to geological explorationdata of a construction site and local construction experience before use, determining a cement mixing amount required by each soil layer to reach design strength, and inputting the cement mixing amount into a current analysis program; after confirming that the device can normally operate through pile testing debugging, starting a pile driver for construction; and during construction, always keeping the device in a power-on state until the construction is finished. The concentration of the cement paste is adjusted according to the hardness of the actual soil layer, so that the cement paste withhigher concentration is sprayed to the soft soil layer, the cement paste with lower concentration is sprayed to the hard soil layer, the cement soil strength of the soft soil layer and the construction efficiency of the hard soil layer are improved, and the application effect of the cement-soil mixing pile composite foundation is improved.