146 results about "Soil strength" patented technology

A method and apparatus for evaluating vulnerability of monopile foundations of offshore wind turbines are provided. The method includes collecting offshore wind farm location data and wind-wave characteristic data, and simulating a wind-wave time course according to the offshore wind farm location data and the wind-wave characteristic data; determining a wind-wave dynamic load based on the wind-wave course; obtaining lateral soil resistance data of monopile foundations with a plurality of rock-soil strength parameters, and inputting the wind-wave dynamic load into a 3D finite element model; using the lateral soil resistance data of monopile foundations with a plurality of rock-soil strength parameters as boundary conditions of the 3D finite element model; and giving a limit state of monopile foundations, and determining vulnerability of monopile foundations on basis of the dynamic response result of the monopile foundations and the limit state of monopile foundations.

The invention relates to a solidified soil proportion and strength prediction method and system based on SEM image analysis, and belongs to the technical field of solidified soil strength testing. Comprising the following steps: S1, measuring physical indexes of disturbed soil; s2, multi-working-condition sample preparation and maintenance; s3, fractal dimension calculation of the SEM image is carried out; s4, unconfined compressive strength testing; s5, establishing a microstructure inversion model and a macroscopic strength prediction model; and S6, proportion optimization and strength prediction: utilizing the microstructure inversion model and the macroscopic strength prediction model to carry out solidified soil proportion optimization or strength prediction. According to the method, the quantitative relation between the microstructure (fractal dimension) and the macroscopic strength is established through SEM image analysis, the defects in the prior art are overcome, and a brand new technical path is provided for resource utilization of disturbed soil.

The invention provides a GNSS-based mountain area highway loess slope stability evaluation method and system, and relates to the technical field of loess slope stability evaluation.The method comprises the steps that firstly, a slope area is divided into grids, geologic feature data of each grid are obtained, super nodes are divided according to the geologic feature data, and the super nodes are divided into super nodes; monitoring points are determined, and the soil moisture content is monitored, so that the moisture content of the soil at different depths is analyzed; secondly, the original displacement is monitored through a GNSS, displacement correction is carried out based on the Fredld unsaturated soil shear strength theory, and the actual displacement is obtained; the influence of the accumulated rainfall on the soil body strength parameters is analyzed, and the soil body strength parameters are corrected in real time; coupling the corrected soil body strength parameter with the actual displacement, calculating a safety coefficient, and judging an early warning state according to the rainfall sensitivity coefficient; and finally, comprehensively judging the stability of the slope according to the early warning state. According to the method, through multi-parameter comprehensive analysis, the accuracy of slope stability evaluation is improved.

The invention relates to the technical field of foundation construction, and provides a building foundation construction method under complex geological conditions. The method comprises the following steps: S1, sampling and detecting land by using equipment, and comprehensively analyzing soil layer, underground water level and geological risk; s2, a foundation pit geometrical shape and a supporting scheme are designed according to an exploration result, and construction safety is ensured; s3, an underground descending well is set up to lower the underground water level of the construction area; s4, a deep mixing pile is adopted for foundation reinforcement, and the bearing capacity of a soil body is improved; s5, the soil body is improved, and the soil strength and stability are improved; and S6, the foundation pit is monitored in real time, and the displacement, the underground water level and the soil pressure of the foundation pit are monitored. By adopting an advanced geological detection technology, the properties of underground soil and rocks can be accurately evaluated before construction, and the measure can find potential geological hidden dangers in time, so that corresponding safety measures are formulated, the risk in the construction process is reduced, and the safety of constructors is ensured.

According to the iron tower foundation stability analysis method for soil body strength attenuation in the rainfall process, the limitation of traditional static soil body parameter evaluation is broken through by constructing a soil body mechanical parameter dynamic coupling model under the rainfall infiltration condition, the influence mechanism of soil body saturation change on the foundation stability is accurately simulated, and the foundation stability is improved. A multi-scale stability analysis method based on hydraulic characteristic spatio-temporal evolution is developed, and a more accurate theoretical basis and technical support are provided for iron tower foundation stability evaluation under the unsaturated soil body condition.

The invention relates to an iron tower foundation safety analysis method considering the dry-wet cycle effect. The method comprises the following steps that 1, a soil body strength degradation constitutive model is established; 2, determining iron tower foundation structure parameters and soil body parameters; 3, establishing an iron tower foundation-soil body three-dimensional geometric model by utilizing three-dimensional modeling software and rock-soil finite element simulation software; 4, applying a load transmitted to the iron tower foundation by the power transmission iron tower in the iron tower foundation-soil body three-dimensional geometric model, defining initial parameters, and establishing a rainwater seepage and dry-wet cycle coupling effect analysis model; 5, analyzing and predicting the cycle index when the safety coefficient of the iron tower foundation is reduced to a threshold value from the two aspects of tower foundation ultimate bearing performance and iron tower foundation-soil body interaction on the basis of a rainwater seepage and dry-wet cycle coupling effect analysis model; according to the method, an efficient and accurate numerical analysis means can be provided for safety assessment of the power transmission tower foundation in the collapsible loess area.

The invention discloses a civil engineering rock-soil strength detection device, and relates to the technical field of civil engineering rock detection. The upper end of the supporting frame is fixedly connected with a detection cylinder, the output end of the detection cylinder penetrates through the upper side wall of the supporting frame and is connected with a strength detection mechanism, the strength detection mechanism is provided with a sealing mechanism, the upper side wall of the treatment box is provided with a detection inlet, and the inner wall of the lower side of the treatment box is fixedly connected with a detection limiting frame. A sweeping mechanism is arranged on the left side of the lifting plate, and a dustproof mechanism is arranged on the outer side of the detection limiting frame. The lower end of the sealing plate is always attached to the upper end face of the treatment box under the action of the abutting spring. Meanwhile, the lower end of a detection limiting frame extends to the inner side of the treatment box, and a good protection effect is achieved through cooperation of a strength detection pressing plate and the detection limiting frame, so that damage to operators caused by broken stone splashing in the detection process is avoided, and the safety of the device during use is greatly improved; and the cleaning mechanism is arranged to realize the automatic cleaning function of the device.

The invention belongs to the technical field of geological research, and particularly discloses a rainfall infiltration induced loess high fill humidifying settlement prediction method which comprises the following steps: S1, acquiring mechanical property parameters of a soil body under different compaction degrees, and fitting the mechanical property parameters under different compaction degrees and different moisture contents to obtain a fitting function; s2, on the basis of an unsaturated loess fluid-solid coupling analysis principle, transforming the fitting function to obtain a soil body humidification interpolation function under different compaction degrees and different water contents; s3, through Comsol finite element software, the interpolation function is embedded into the soil elastic-plastic constitutive model, and the weakening process of soil strength parameters along with soil humidifying deformation is simulated. By the adoption of the method for predicting the rainfall infiltration induced loess high-fill humidifying settlement, the problem that a loess high-fill foundation cannot be subjected to systematic humidifying settlement prediction aiming at rainfall is solved, and safety guarantee is provided for high-fill foundation engineering.

The invention provides a coarse-grained soil strength prediction method considering permeation erosion and mudstone fine grain content, and belongs to the technical field of soil strength prediction. Aiming at the defects in the prior art, the influence of penetration erosion on the shearing performance of coarse-grained soil with different mudstone fine grain contents is considered, and the siliceous mudstone coarse-grained soil strength prediction model considering the penetration erosion effect is constructed, so that the strength prediction precision can be improved; therefore, a better guiding effect is provided for design, construction and operation maintenance of the coarse-grained soil highway subgrade in the mountainous area.

The present invention discloses a method and system for predicting the shear strength of unsaturated soil, and relates to the technical field of calculating the shear strength of unsaturated soil, and comprises the following steps: obtaining multiple hydraulic paths of any point on the soil water retention curve, obtaining multiple groups of moisture absorption path curve integrals and dehumidification path curve integrals of the point in its different hydraulic histories based on the multiple hydraulic paths, wherein the hydraulic paths include moisture absorption paths and dehumidification paths, and the hydraulic history is the repeated change process of dehumidification and moisture absorption of the point from the initial state to the research state; inputting multiple groups of moisture absorption path curve integrals and dehumidification path curve integrals of any point in the soil water retention curve in its different hydraulic histories and the saturated shear strength parameters of the test soil into the modified shear strength formula, obtaining the corresponding shear strength, and completing the prediction of the shear strength of unsaturated soil. The present invention can significantly improve the accuracy of the calculation of the shear strength of unsaturated soil, and is conducive to the popularization and application of the unsaturated soil strength calculation in actual engineering.

An agricultural machine includes a soil strength generation system that generates an output indicator of soil strength. A control system generates on action signal based on the soil strength.

The invention relates to a seepage stratum shield launching and receiving end head reinforcing method which comprises the following steps: firstly, marking an extension contour line of a tunnel on the ground surface of one side, facing the tunnel, of a working well, and marking a reinforcing area outside a predetermined contour line of the tunnel; and then an RJP construction method is adopted for conducting preliminary reinforcement on the reinforcement area, a plurality of RJP pile bodies arranged along the extending contour line are formed, the RJP pile bodies are cooled after being solidified, soil layers around the RJP pile bodies are frozen through cooling, and curtains are frozen on the two sides of the extending contour line. According to the technical scheme, the soil body strength can be improved, the soil body stability can be enhanced, the soil body permeability can be reduced, the soil body deformation can be controlled, the freeze-thaw cycle resistance can be improved, and the problem that the geological state around working wells at the starting end and the receiving end is unstable in the seepage stratum shield construction process can be effectively relieved and overcome.

The invention relates to the technical field of tunnel engineering, and provides a subsidence lifting method and system for a tunnel penetrating through a ground fissure.The method comprises the steps that an initial tunnel model representing a subsidence tunnel is established on the basis of a numerical modeling system, the subsidence process of the tunnel penetrating through the ground fissure.The subsidence process of the tunnel penetrating through the ground fissureis simulated according to the initial tunnel model, and tunnel lifting construction is simulated; determining an actual lifting construction scheme; according to an actual lifting construction scheme, on-site construction and monitoring are carried out, and the method comprises the steps that sensors are arranged on a tunnel and a deformation joint, and a digital twin model is constructed and used for monitoring the change conditions of the tunnel and the deformation joint in the on-site construction period; and grouting, reinforcing and lifting the tunnel by adopting the actual lifting construction scheme. Ground fissures and surrounding soil bodies are reinforced through grouting, the strength and integrity of the soil bodies are improved, movement of the ground fissures is restrained, the tunnel structure is actively lifted through expansive force of the grouting bodies, and tunnel settlement is effectively controlled.

The invention discloses a dredged mud upper and lower part double-face combined vacuum consolidation drainage method, which comprises the following specific implementation processes: laying a horizontal sand bag containing a PVC (Polyvinyl Chloride) pipe and a vertical drainage pipe at the bottom of a cofferdam foundation pit to serve as a bottom drainage system, blowing and filling dredged mud in a layered manner, controlling the thickness and the water content of each layer, and when the water content of a soil body is lower than twice liquid limit, stopping drainage; starting the bottom vacuum water pumping device to perform preliminary water drainage, inserting straw bundles into the soil body through hollow pipes with bottom covers to form a vertical water drainage structure after the strength of the soil body meets the requirement, sequentially laying geotechnical cloth, a straw woven blanket, a PVC water drainage pipe network and a sealing film on the top to construct a top vacuum system, and finally synchronously starting the top vacuum water pumping device and the bottom vacuum water pumping device. The vacuum difference is controlled by adjusting the ventilation device, and upper and lower double-face combined vacuum consolidation drainage is achieved. The drainage consolidation of the dredged mud is effectively accelerated, the treatment efficiency is improved, and the drainage effect is enhanced through precise control over the vacuum degree and application of materials such as straw.

The invention discloses a goaf microorganism and plant synergistic soil fixation method and a soil fixation device, belongs to the technical field of goaf soil fixation, and aims to solve the problem that an existing goaf fixation process is difficult to realize deep stabilization and ecological restoration synergistic treatment, and the goaf microorganism and plant synergistic soil fixation method comprises the following steps: S1, pretreating the ground surface of a goaf; s2, acquiring goaf data; s3, determining a core reinforcement area and an ecological restoration area according to the model data in the S2; s4, deep injection reinforcement is conducted on the core reinforcement area; step S5, planting plants, step S6, carrying out drip irrigation on the ecological restoration area, and monitoring the matrix strength growth rate S and the plant root development index RDI in real time; s7, determining that the repair is qualified according to the collected data of the S and the RDI; a deep loose matrix is effectively cemented through the microbial mineralization effect, the strength and stability of the soil body are improved, the integrity of the surface soil body and the water and soil conservation capacity are enhanced through plant root systems, and the synergistic enhancement effect is formed.

An agricultural machine includes a soil strength generation system that generates an output indicator of soil strength. A control system generates on action signal based on the soil strength.

The invention discloses a pile-soil interface shearing algorithm considering related characteristics of a soil body state. The pile-soil interface shearing algorithm is suitable for calculating pile side friction resistance after a pile foundation is driven in offshore engineering. The method mainly comprises the following steps: (1) transferring stress and strain tensors obtained by calculation of a constitutive model considering that rigidity and strength parameters of a soil body change along with the state of the soil body to a soil and structure interface shear model; (2) assuming that a soil and structure contact interface is in a simple shearing state, and iteratively solving the normal strain of the interface; and (3) calculating the normal stress and the interface tangential stress through the calculated normal strain, and considering the influence of the strength change of the pile-side soil body on the interface shear strength. According to the method, the soil constitutive model related to the state is introduced on the basis of traditional coulomb friction, constitutive responses of the soil in different confining pressure and shear strain states can be reflected, pile-soil interface mechanical behaviors are calculated, and the influence of soil characteristics on the interface behaviors is reflected more reasonably.

The invention discloses a solidified soil strength prediction method based on improved deep learning and a related device, and the prediction method comprises the steps: inputting a to-be-predicted soil sample basic physical characteristic parameter and a solidification test sample preparation parameter into a pre-trained deep learning neural network model, and outputting a soil sample strength index prediction result; the model construction and training method comprises the following steps: acquiring a sample data set; performing pretreatment; constructing a multi-layer neural network architecture, determining an optimal hidden layer number and an optimal hidden layer node number based on the sample data set, and obtaining a target neural network; and optimizing the weight of the target neural network by adopting the sample data set to obtain a trained deep learning neural network model. According to the method, a two-stage optimization mechanism is adopted, global optimization of the model structure and the model weight is achieved, the prediction effect is remarkably improved, the model training efficiency is improved, an interpretable machine learning technology is innovatively introduced, and an innovative solution is provided for intelligentization of resource utilization of muck and slurry.

The invention discloses anti-scouring alkali-activated solidified soil for an offshore wind power pile foundation and a preparation method, and is applied to the fields of ocean engineering and geotechnical engineering. The sludge curing agent is mainly composed of sludge and a curing agent, and the dosage ratio of the sludge to the curing agent is 100: (18-21). The formula of the curing agent comprises the following components in parts by weight: 12 parts of blast furnace slag, 0-2 parts of CaO and 6-7 parts of MgO. The curing agent has the beneficial effects that solid wastes can be effectively utilized, the pollution is reduced, the carbon emission is reduced, the production cost of the curing agent is reduced, and meanwhile, in the using process, the curing effect of the curing agent on soil is improved and the strength, the stability and the anti-scouring property of the cured soil are improved by adding the alkaline exciting agent. The generated alkali-activated solidified soil can be applied to offshore wind turbine pile foundation protection, can adapt to a high chloride ion (Cl <->) concentration sludge environment, and is an effective and sustainable method.

The application provides a loess slope stability evaluation method and system based on GNSS, and relates to the technical field of loess slope stability evaluation.The application first divides the slope area into grids, obtains geological feature data of each grid, divides super nodes according to the geological feature data, determines monitoring points and monitors soil moisture content to analyze the soil moisture content at different depths.Secondly, the original displacement is monitored by using GNSS, the displacement is corrected based on the Fredlund unsaturated soil shear strength theory to obtain the actual displacement, the influence of cumulative rainfall on the soil strength parameter is analyzed, and the soil strength parameter is corrected in real time, the corrected soil strength parameter and the actual displacement are coupled, the safety factor is calculated, and the early warning state is judged according to the rainfall sensitivity coefficient.Finally, the stability of the slope is comprehensively judged according to the early warning state.The method improves the accuracy of the slope stability evaluation through comprehensive analysis of multiple parameters.

The invention relates to the technical field of data processing, and discloses a method for determining construction parameters of foundation pit excavation. Rainfall information and construction progress information of the to-be-excavated area in the foundation pit excavation process are obtained; determining target soil body strength and underground water level information of the to-be-excavated area according to the rainfall information; inputting the target soil body strength, the underground water level information and the construction progress information into the first finite element model to obtain a second finite element model; and through a second finite element model, or through a particle swarm algorithm and the second finite element model, optimizing the first construction parameter to obtain a second construction parameter. According to the technical scheme, the construction parameters can be adjusted according to the rainfall information in the excavation process of the foundation pit, the deformation condition of the foundation pit after excavation of the foundation pit can be reduced, and the safety and the excavation efficiency of the foundation pit can be improved.

A tunnel disease control structure and construction method using inclined pile grouting reinforcement, the control structure comprising a tunnel structure, an inclined pile group and a reinforcement area, the inclined pile group comprising a plurality of left inclined piles and right inclined piles, the left inclined piles and right inclined piles being respectively located in the soil layers on both sides of the tunnel structure, and being symmetrically or asymmetrically distributed, the left inclined piles and right inclined piles being cross-passed by each other at a certain distance at the bottom of the tunnel structure, the reinforcement area being located between the tunnel structure and the inclined pile group, and comprising a bottom reinforcement area and a side reinforcement area; thereby, the present invention can permanently improve the strength and bearing capacity of the soil outside the tunnel structure, solve problems such as soil disturbance and deformation around the tunnel structure, fundamentally avoid diseases such as uneven settlement and large deformation of the tunnel structure, improve the safety of the tunnel structure, and reduce subsequent operation and maintenance costs.

The application discloses a kind of solidified soil strength calculation method and system considering freeze-thaw cycle number and burying depth, propose the strength and modulus reduction factor concept of solidified soil under different freeze-thaw cycle;Then according to the test data obtained, the strength and modulus reduction factor of solidified soil under the action of freeze-thaw cycle under different burying depth is calculated;Strength and modulus reduction factor and burying depth, freeze-thaw cycle number composite exponential function model is established;Through composite exponential function model, the reduction factor of solidified soil under different freeze-thaw cycle is calculated, the strength and modulus of solidified soil without freeze-thaw cycle obtained by indoor test are combined, and the strength and modulus of solidified soil under different depth and freeze-thaw cycle are calculated.In practical engineering, the strength and modulus of solidified soil under different freeze-thaw cycle number at different burying depth can be used for long-term strength and deformation calculation of foundation.

The utility model discloses a structural steel plate cement soil stirring wall structure for a deep foundation pit. The structural steel plate cement soil stirring wall structure comprises a three-axis cement soil stirring wall, H-shaped steel and U-shaped steel plate piles. Wherein the three-axis cement soil stirring wall is of a three-circle lap joint pile body structure, and the H-shaped steel and the U-shaped steel sheet piles are arranged in the three-axis cement soil stirring wall. A plurality of profile steels and a plurality of U-shaped steel sheet piles are uniformly distributed in the three-axis cement-soil stirring wall; convex spigots are arranged on the H-shaped steel, concave spigots are arranged on the U-shaped steel sheet piles, and the H-shaped steel and the U-shaped steel sheet piles are connected through the convex spigots and the concave spigots to form a continuous steel sheet pile combination. According to the U-shaped steel sheet pile, the concave spigots are meshed with the convex spigots of the H-shaped steel, so that the problem that the local shear bearing capacity of a traditional SMW construction method pile cannot be calculated completely due to the fact that the strength of cement soil is too low is solved, and meanwhile the problem that the cement soil between the steel sections is extruded out due to the pressure effect of water and soil on the outer side is solved.

The present invention provides a numerical simulation evaluation method for the mechanical properties of an undersea tunnel under earthquake action, which relates to the field of undersea tunnel damage technology. The specific steps include: systematically collecting parameters such as the geometric dimensions and material properties of the tunnel; using finite element analysis to establish a three-dimensional geometric model to perform numerical simulations of static and dynamic responses; constructing static and dynamic test models, training them through expert-assessed bearing capacity labels to obtain more accurate static and dynamic bearing capacities; performing data processing on environmental factors such as soil strength, groundwater level, and temperature changes, generating correction coefficients to correct bearing capacity values; and generating comprehensive coefficients by calculating static and dynamic stability coefficients to evaluate the damage state of the undersea tunnel. The present invention provides a scientific basis for seismic design, accurately reflects the damage state of the tunnel under the most unfavorable earthquake motion, and comprehensively considers the influence of environmental factors on tunnel damage, significantly improving the accuracy and reliability of the evaluation.

The application discloses a large-section railway tunnel surrounding rock stability control method, comprising the following steps: step S1, using a soil strength device to detect the strength in the tunnel; step S2, dividing out the broken area with soil strength lower than a predetermined threshold and marking it as a low-strength area, and dividing out the area with soil strength higher than the predetermined threshold and marking it as a high-strength area; step S3, according to the different strength parameters of each low-strength area, calculating the amount of grouting material needed to be injected into each low-strength area to achieve the same strength, and injecting the corresponding amount of grouting material into each low-strength area; step S4, covering the surface of the low-strength area with a glass fiber cloth; and step S5, coating a layer of concrete. According to the application, targeted grouting is carried out according to the different strengths of different broken areas, so that the broken areas with different strengths can achieve relatively consistent strength after reinforcement treatment, and the purpose of uniformly strengthening the tunnel is finally achieved.

A horizontal active drainage system for a waterlogged loess slope relates to the technical field of slope drainage and comprises a drill hole arranged on a slope surface, a water seepage pipe arranged at the bottom of the drill hole, a filter layer wrapped on the side surface of the water seepage pipe, a hole packer arranged at one end of the water seepage pipe close to the slope surface, an ejector rod is arranged at the end, connected with the water seepage pipe, of the hole packer and arranged in the water seepage pipe, the other end of the hole packer is exposed out of the drill hole, and a vacuum pump is arranged at the exposed end of the hole packer. The water seepage device is high in practicability and very convenient to use, the filter layer is arranged on the water seepage pipe, the filter layer is tightly attached to the wall of a drill hole, the wall of the drill hole is free of a free face, and soil strength reduction caused by hole collapse and fine particle accumulation is avoided; the spiral blade is arranged on the hole packer, so that a good hole sealing effect is achieved; the vacuum pump on the hole packer actively pumps water to solve the problem of poor water permeability of loess, the single well influence range is large, the drainage period is short, and the effect on slope stabilization is fast.

The invention belongs to the technical field of rock-soil detection devices, and particularly relates to rock-soil strength detection equipment and method for road and bridge engineering geological investigation. Inserting bottom rods are evenly arranged at the bottoms of the splicing sliding rails, the two splicing sliding rails are assembled together to form a long-strip-shaped guide rail, the long-strip-shaped guide rail is laid on the road surface, and the long-strip-shaped guide rail is simply fixed through the inserting bottom rods; wall-attached rotating wheels are symmetrically arranged at the bottom of the movable base, and the outer surfaces of the wall-attached rotating wheels are in rolling connection with the inner walls of the splicing sliding rails. Data analysis is carried out on the undeveloped road section, the spliced sliding rail is anchored on the road section through the insertion bottom rod below the spliced sliding rail, and the inner wall of the spliced sliding rail is always kept in a relatively flat state, so that the acquisition component can smoothly slide along the road section, and the phenomenon of rollover caused by road condition problems is avoided; after collection is completed, the collection part and the splicing sliding rail can be recycled, the recycling effect is achieved, and the sampling work of various road conditions is met.

A method includes receiving a machine data set; determining a respective soil strength measurement; processing the respective soil strength measurement to generate a recommendation including an executable agricultural prescription; and storing the executable agricultural prescription. A computing system includes a processor and a memory storing instructions that, when executed by the one or more processors, cause the computing system to: receive a machine data set; determine a respective soil strength measurement; process the respective soil strength measurement to generate a recommendation including an executable agricultural prescription; and store the executable agricultural prescription. A non-transitory computer readable medium includes program instructions that when executed, cause a computer to receive a machine data set; determine a respective soil strength measurement; process the respective soil strength measurement to generate a recommendation including an executable agricultural prescription; and store the executable agricultural prescription.

The invention relates to the field of building precast pile foundation construction, and discloses a precast pile implanting double-control construction method which comprises the following steps that a long spiral drilling machine is used for drilling a guide hole downwards in the forward direction, the diameter of the guide hole is 50-150 mm smaller than the designed pile diameter, and the drilling depth is equal to the value obtained by subtracting the thickness of a reserved bearing layer from the designed pile length; after drilling is stopped, the power head rotates reversely, the long spiral drill rod lifts the drill passively, loose soil is returned into the hole and compacted, and a dense wall protection layer is formed; the drill rod is jacked by the counter-acting force of the soil body to complete drill lifting, and a hole guiding channel with a compressed soil body structure is formed; then, a precast pile is implanted into the channel, and the double-control requirements of the designed pile length and the penetration / final pressure value are synchronously met; according to the construction method, through forward and reverse rotation operation, under the condition that an original soil layer on the inner side wall of a pile hole is not disturbed, loose soil back pressure wall protection is achieved, the soil strength is reduced, the double-control standard is met, the drilling diameter is small, disturbance of the soil layer on the hole wall is avoided, the thickness of a bearing layer is reserved, the completeness of the bearing layer at the pile end is guaranteed, and the stability and bearing capacity of a pile foundation are improved.