30 results about "Lateral earth pressure" patented technology

This invention belongs to the field of data analysis technology and provides a data-based intelligent monitoring method and system for the safety of pit construction. The method includes acquiring horizontal displacement data, support pile stress data, lateral earth pressure data, pore water pressure data, and pit perimeter vibration acceleration data of the supported pit; determining a displacement risk coefficient based on the horizontal displacement data; determining a stress overload coefficient based on the support pile stress data; determining an earth pressure fluctuation coefficient based on the lateral earth pressure data; determining a water pressure change coefficient based on the pore water pressure data; determining a vibration damage coefficient based on the pit perimeter vibration acceleration data; and determining a comprehensive impact index. By collecting data directly related to the ongoing pit construction, the method can accurately capture the disturbance effects of vibration, stress transmission caused by soil excavation, and groundwater level changes caused by precipitation on the completed pit.

The application discloses a foundation pit support pile construction method, and relates to the field of pile foundation construction technology, which comprises the following steps: step one, foundation pit support pile construction, a pile body of a foundation pit support pile is arranged in a soil body, a pre-pulling hole is arranged along the length direction of the pile body, a pre-pulling rope is arranged in the pre-pulling hole, and the lower end of the pre-pulling rope is fixedly arranged on the pile body; and step two, pre-stress is applied to the pile body, the upper end of the pre-pulling rope is pulled, and the upper end of the pre-pulling rope is fixed after the pre-pulling rope is pulled to a set position to maintain the pre-stress of the pre-pulling rope. The application has the effect of preventing the pile body of the foundation pit support pile from being bent, the ability of the pile body to resist lateral earth pressure is enhanced, the deformation of the pile body can be effectively reduced, and the safety of a foundation pit project is ensured.

The invention belongs to the technical field of post-cast strip construction, and particularly discloses a basement side wall post-cast strip supporting device which comprises two sets of supporting pieces which are supported on the two sides of a post-cast strip respectively and used for bearing and transmitting lateral soil pressure acting on the side wall of the post-cast strip; the embedded parts are embedded in the positions, on the two sides of the post-cast strip, of the basement side wall and the basement bottom plate; the self-adaptive locking mechanism is arranged between the supporting part and the embedded part and is used for detachably locking the supporting part to the corresponding embedded part; the self-adaptive locking mechanism can enable the supporting piece to be adjusted in position relative to the embedded piece in the vertical direction of the basement side wall or the transverse direction of the basement bottom plate during installation, and locking is achieved after the supporting piece is adjusted in place. The original design stress mode of the retaining wall at the position of the post-cast strip is not changed, and structural deformation at the position of the post-cast strip is avoided.

The utility model discloses a dumbbell-shaped lock catch pile cofferdam for deep foundation pit construction, and relates to the technical field of cofferdams. The device comprises a plurality of dumbbell-shaped frames, the dumbbell-shaped frame comprises two C arc sections; straight line sections parallel to each other are connected between the two C arc sections; two connecting plates are symmetrically fixed between the two linear sections; reinforcing plates are connected between the connecting plates and the adjacent C arc sections and the linear sections; an outer frame is arranged on the periphery of the dumbbell-shaped frame; and a back cover is arranged on the bottom surface of the dumbbell-shaped frame. The cofferdam of the dumbbell-shaped frame is designed, the middle of the cofferdam is narrow, the two ends of the cofferdam are wide, the cofferdam is similar to the combination of two arcs, the shape enables the cofferdam to be higher in stability when resisting external force such as water flow impact and lateral soil pressure, meanwhile, compared with a rectangular frame, the dumbbell-shaped frame is larger in internal operation space, the two C-shaped arc section parts are only used as boundary beams and not used as diagonal bracings and inclined bracings, and the structure is simple. While the overall stability of the cofferdam is ensured, a larger and more convenient operation space can be brought.

This invention discloses a pseudo-static calculation method, system, storage medium, and electronic device for active earth pressure in finite-width fill under seismic conditions using the RB displacement mode. The method first determines the failure mode based on the fill geometry, identifying a potential slip surface composed of a combination of logarithmic spirals and straight lines. The core innovation lies in establishing a small principal stress trace arch model to quantitatively analyze the deflection of principal stresses in the soil caused by friction at the wall-soil and rock-soil interfaces, and deriving the lateral earth pressure correction coefficient. K w Based on this, the damaged soil is divided into zones, and differential equations considering the equilibrium of seismic inertial force, self-weight, and interface forces are established, combined with the aforementioned correction coefficients. K w By performing the solution, a more realistic distribution of earth pressure intensity, magnitude of resultant force, and location of application point are obtained. This invention overcomes the limitations of traditional semi-infinite soil theory and provides an accurate and reliable theoretical tool for the seismic design and stability analysis of retaining structures in narrow spaces.

The utility model relates to the technical field of cofferdams, and discloses a double-row steel sheet pile cofferdam structure which comprises a cofferdam body connected to a foundation and an internal supporting body connected to the interior of the cofferdam body, two wave walls are arranged at the top of the internal supporting body, a flood prevention channel is arranged between the two wave walls, and the flood prevention channel is communicated with the cofferdam body. The side, away from the flood prevention channel, of one wave wall is connected with a concrete protection slope, and the side, away from the flood prevention channel, of the other wave wall is connected with a gravel protection slope. According to the double-row steel sheet pile cofferdam structure, the cofferdam body and the internal supporting body are arranged, the multiple first laminations and the multiple second laminations which are alternately stacked are arranged between the two U-shaped steel sheet piles of the cofferdam body, and the multiple short sand bags of the first laminations and the long sand bags of the second laminations are stacked in a crossed mode, so that the overall stability of a soil body in the cofferdam is improved; the lateral soil pressure of the internal soil body on the steel sheet piles is reduced, the overall stability is improved, and deformation of the steel sheet pile cofferdam is avoided.

This invention relates to the field of drainage ditches and discloses an installation method for a support-free prefabricated side ditch, comprising the following steps: Step 1, inserting two self-advancing templates into the soil; Step 2, excavating between the two self-advancing templates; Step 3, pouring the side panels; Step 4, removing the self-advancing templates, which can be reused. This method eliminates the need for foundation pit support and on-site pouring of the base slab, requiring only the pouring of the side panels. While ensuring resistance to lateral earth pressure, it achieves smooth drainage, reliable quality, reduced investment, less land occupation, and meets the requirements of industrialized construction.

The invention discloses a construction method of an assembled shed tunnel structure. A conventional slope collapse prevention open cut tunnel structure of a railway does not bear lateral soil pressure on the slope side theoretically and is not suitable for sections with serious bias pressure. The method comprises the following steps: constructing a hole-digging anchoring pile and a hole-digging filling pile; formwork-erecting cast-in-place bearing platform beams and formwork-erecting cast-in-place concrete walls; hoisting breast boards in a layered manner, synchronously placing sand and pebble inverted filter layers in a layered manner, synchronously compacting and backfilling soil and stones in a layered manner, and casting top beams in situ; installing a top plate in the skylight time of railway operation; soil and stones are compacted and backfilled to the top surface of the top beam layer by layer; an EVA waterproof plate is laid; a concrete water-resisting layer is cast in place; filling, layered rolling and backfilling of soil and stones; and in combination with terrain and hydrological conditions, a drainage ditch is excavated and arranged on the top surface of the backfilled soil stone. The method solves the problem that the conventional open cut tunnel construction seriously affects the operation of the existing railway, and also solves the problem that the conventional open cut tunnel cannot bear a larger load on the side close to the mountain.

The utility model relates to the technical field of steel pipe pile supporting structures, in particular to a steel pipe pile supporting structure suitable for a sandy gravel stratum subway foundation pit, which comprises a foundation pit and a plurality of guide holes mechanically formed in the sandy gravel stratum of the foundation pit, steel pipes are driven into the guide holes, top beams are fixedly arranged at the tops of the steel pipes, one ends of the steel pipes are anchored into the top beams, and the other ends of the steel pipes are anchored into the foundation pit. Steel supports are fixedly arranged at the tops of the steel pipes, the steel supports are located between the top beams, and a proposed subway channel structure is formed in the bottoms of the steel supports. By arranging the steel pipe concrete combined piles, the rigidity and bearing capacity of the steel pipes are remarkably improved, lateral soil pressure and water pressure can be better resisted, and foundation pit deformation is effectively controlled; the cast-in-place reinforced concrete top beam is arranged at the tops of the steel pipes, the row of steel pipe piles are connected into a whole, the integrity and stability of the supporting structure are enhanced, the supporting structure can better adapt to stratum changes, and the risk of supporting failure caused by uneven stratums is reduced.

The application relates to the technical field of cable protection pipe detection, in particular to a compression strength detection device for a cable protection pipe, which comprises a portal frame, a vertical sliding platform slidingly arranged in the portal frame, a cable protection pipe arranged below the vertical sliding platform, an upper pressure intelligent sensor arranged above the cable protection pipe, a supporting driving assembly arranged below the cable protection pipe, two groups of air pressure connecting assemblies symmetrically arranged outside the cable protection pipe, and two groups of lateral pressure detection assemblies symmetrically arranged outside the cable protection pipe. Through the cooperation of the supporting driving assembly, the air pressure connecting assemblies and the lateral pressure detection assemblies, the compression strength detection device can synchronously press and detect multiple surfaces of the cable protection pipe, can simulate the combined stress state of the overlying load + lateral earth pressure that the cable protection pipe bears in the real buried environment, and can further improve the accuracy of the cable protection pipe detection result and reduce the detection error.

The utility model relates to the technical field of material mechanics, and discloses a vertical anti-seepage HDP connecting lock catch which comprises an outer-layer buckle, an inner-layer buckle, an outer supporting strip, an inner supporting strip, a sliding assembly, a clamping assembly and a supporting assembly. The outer-layer buckle is fixedly connected to the outer supporting strip, and the inner-layer buckle is fixedly connected to the inner supporting strip; the clamping assembly is arranged at the end of the outer-layer buckle, and the supporting assemblies are arranged on the two sides of the outer-layer buckle. Through the design of the clamping assembly, that is, the outer layer buckle and the inner layer buckle are in sliding clamping connection through the clamping protruding head and the clamping groove, and the water absorption material is arranged, the tightness and stability of connection are ensured, and the connection integrity between HDPE films is effectively improved; the elastic supporting strips and the supporting pieces can provide reliable supporting when the connecting lock catches bear external force such as water pressure in the vertical direction and lateral soil pressure, the stability of the structure is guaranteed, then the anti-seepage performance of the joint of the HDPE film flexible vertical anti-seepage wall is enhanced, the reliability of the whole vertical anti-seepage wall is improved, and the service life of the whole vertical anti-seepage wall is prolonged.

The utility model discloses a brick-gabion-geogrid combined type reinforced earth retaining wall, and belongs to the technical field of civil engineering. Comprising a steel reinforcement cage, connecting pieces and geogrids, the steel reinforcement cage is cubic and comprises six sets of steel reinforcement meshes, and the six sets of steel reinforcement meshes form the six faces of the steel reinforcement cage; the reinforcing mesh comprises a square frame, a plurality of transverse rods and a plurality of longitudinal rods, the transverse rods are longitudinally distributed in the square frame at equal intervals, and the longitudinal rods are transversely distributed in the square frame at equal intervals; the adjacent reinforcing meshes are connected together through the connecting pieces; the geogrid is laid on the ground, the number of the reinforcement cages is multiple, and the reinforcement cages are installed on the geogrid; according to the brick-gabion-geogrid combined type reinforced earth retaining wall, through reasonable steel bar distribution and in combination with the connecting mode of the spiral connecting pieces, the steel bar cage has high rigidity and stability, lateral earth pressure and other external force can be effectively resisted, and the deformation risk is reduced.

The invention provides a pile foundation side friction coefficient obtaining method combined with a lateral pressure test. The pile foundation side friction coefficient obtaining method comprises the following steps that S1, lateral soil pressure stress calibration based on the lateral pressure test is conducted; s2, pile pulling test and real-time monitoring of lateral soil pressure stress in a calibration position guide hole; s3, analyzing a lateral soil pressure stress continuous function in a calibration position guide hole in the pile pulling test process; s4, the pile foundation side pressure stress is mapped in real time in the pile pulling test process; and S5, solving a side friction coefficient. The pile side pressure stress is indirectly measured, the technical problem that the pile side pressure stress of irregular side wall pile types such as cast-in-place piles cannot be directly and accurately measured in the pile pulling process is successfully solved, and fine testing of the pile side friction coefficient of the pile foundations of the type becomes possible; according to the method, the pile side frictional resistance energy dissipation work is constructed by adopting the double integral of the product of the pile side pressure stress, the frictional resistance coefficient and the action area on the depth and the time for the first time, a pile side pressure stress continuous mapping function is fully utilized, and fine solving of the frictional resistance coefficient is guaranteed.

The present application belongs to the technical field of earth pressure calculation of fill structure, and specifically discloses a data-mechanism dual-driven fill structure earth pressure prediction method and system. The method comprises the following steps: obtaining test earth pressure and test covering soil parameters according to fill structure earth pressure test; inputting the test earth pressure into a three-dimensional earth pressure model of the fill structure top covering soil to obtain test stress width of the fill structure and test lateral earth pressure coefficient of the soil body; constructing a first prediction model between the test stress width and the test covering soil parameters and a second prediction model between the test lateral earth pressure coefficient and the test covering soil parameters; obtaining real-time covering soil parameters and inputting the real-time covering soil parameters into the first prediction model and the second prediction model to obtain predicted stress width and predicted lateral earth pressure coefficient; inputting the predicted stress width and the predicted lateral earth pressure coefficient into the three-dimensional earth pressure model to obtain real-time predicted earth pressure. The present application can enhance the interpretability and accuracy of the prediction results of the prediction model.

This utility model relates to the technical field of anti-collapse support structures, and discloses an anti-collapse support structure for the sides of large deep foundation pits, including side baffles and corner baffles, both with protrusions at both ends and in the middle. Adjacent side baffles are slidably fitted onto a sliding groove via a locking strip, and adjacent corner baffles are slidably fitted onto a sliding groove via a locking strip. The outer side of the side baffles is bolted to a locking frame and a side crossbeam, and the outer side of the corner baffles is bolted to a locking frame and a corner crossbeam. The locking frame and the crossbeam are connected via bolt holes. The side baffles and corner baffles have anchor holes, with rotatable retaining rings threaded into the holes. The retaining rings are connected to anchor seats via bearings, and have handles and ball bearings on their outer sides. This utility model improves construction efficiency and economy through modular sliding connections and a detachable support system, shortens the construction cycle through rapid assembly, reduces costs through reusable components, resists lateral earth pressure through the overall structure, and enhances the reinforcement effect by combining anchor bolts with synergistic support, thus avoiding the risk of collapse.

The invention relates to the technical field of safety monitoring, and discloses a hydraulic tunnel deep shaft underground diaphragm wall lateral soil pressure meter installation construction method, which comprises the following construction steps that 1) a groove is formed in a construction site by a groover, and groove side walls are arranged on two sides of the groove; (2) tank cleaning treatment is carried out; (3) a reinforcement cage is put down, cage side parts are arranged on the two sides, and side part intervals are formed between the cage side parts and the groove side walls; the reinforcement cage is provided with a power pushing structure and a connecting plate thereof, and a lateral soil pressure meter is arranged on the connecting plate; (4) after the reinforcement cage descends to the set depth and is fixed, the power pushing structure pushes the connecting plate until the lateral soil pressure meter abuts against the side wall of the groove; and (5) concrete is poured, the reinforcement cage is wrapped in the concrete, the concrete is solidified to form the underground diaphragm wall, and the lateral soil pressure meter is exposed on the side portion of the underground diaphragm wall, so that even if the soil pressure changes after the concrete is solidified, lateral soil pressure monitoring data can still meet the accuracy requirement.

This invention discloses a steel cylinder vibration sinking simulation test system and its test method, comprising: a steel cylinder model, a vibration sinking test device, a static pressure sinking test device, and a data acquisition system; the vibration sinking test device is used to conduct vibration sinking simulation tests, strain and stress data at various test points on the outer wall of the steel cylinder model are obtained through strain gauges on the outer wall of the steel cylinder model during vibration sinking, earth pressure sensors are used to obtain earth pressure change data at various test points during vibration sinking, earth pressure sensors and pore water pressure sensors are used to monitor the distribution data of lateral earth pressure and pore water pressure during vibration sinking through earth pressure sensors and pore water pressure sensors installed on the outer side of the steel cylinder model, and vibration acceleration signal data at various test points during vibration sinking are collected through acceleration sensors installed on the steel cylinder model; static pressure tests are conducted using the static pressure sinking test device to obtain the maximum pressure that the steel cylinder model can withstand when placed at different depths in the soil layer.

The application discloses a building foundation outer wall lateral soil pressure simulation applying device, which comprises a thrust applying device and a geotechnical lateral soil pressure simulation device; wherein the geotechnical lateral soil pressure simulation device is in the shape of a right trapezoid; the inclined surface of the geotechnical lateral soil pressure simulation device is used for abutting against the geotechnical material; the thrust applying device is used for applying a thrust to the right angle surface of the geotechnical lateral soil pressure simulation device, so that the geotechnical lateral soil pressure simulation device is in close contact with the geotechnical material; and the device is helpful to solve the problems that the distribution rule of the lateral pressure applied to the building foundation lateral wall by horizontally moving a flat thrust plate does not conform to the actual situation, the lateral pressure applied to the position with a relatively shallow buried depth is too large, and the lateral pressure applied to the position with a relatively deep buried depth is relatively small.

The application belongs to the technical field of post-pouring strip construction, and particularly discloses a basement side wall post-pouring strip supporting device, which comprises the following components: supporting members, the supporting members are provided in two groups, the two groups of supporting members are respectively supported on the two sides of the post-pouring strip and are used for bearing and transmitting the lateral earth pressure acting on the side wall of the post-pouring strip; embedded members, the embedded members are embedded on the side wall and the bottom plate of the basement on the two sides of the post-pouring strip; self-adapting locking mechanisms, which are arranged between the supporting members and the embedded members and are used for detachably locking the supporting members to the corresponding embedded members; the self-adapting locking mechanisms can enable the supporting members to be adjusted in position along the vertical direction of the side wall of the basement or the horizontal direction of the bottom plate of the basement relative to the embedded members during installation and to be locked after being adjusted in position. The basement side wall post-pouring strip supporting device can not change the original design stress mode of the retaining wall at the post-pouring strip position and can avoid the deformation of the structure at the post-pouring strip position.

The present application relates to a kind of new type of wall protection mud material for ultra-deep underground continuous wall and its preparation method, comprising the following steps: pour mixing water into the first container, while adding bentonite, the first container is stirred to be uniformly dispersed;Sodium carbonate, sodium carboxymethyl cellulose, xanthan gum and silicone acrylic emulsion are mixed and added to mixing water and poured into the second container, and stirred to be fully hydrated;Mix the solution in the first container and the second container, stir to be fully mixed, complete mud preparation.The beneficial effects of the present application are: it can avoid the hidden troubles such as excessive lateral earth pressure, large amount of mud loss, thin and dense mud skin cannot be formed when the excavation depth of underground continuous wall is large, configure a new type of modified bentonite wall protection mud with suitable physical stability and chemical stability, appropriate relative density, good mud skin forming property, which can adapt to the working condition of ultra-deep underground continuous wall, avoid the occurrence of hole collapse and shrinkage phenomenon, so as to ensure the quality of slotting and construction safety.

According to the retaining wall, a T-shaped section beam originally used for a bridge is reversely reconstructed into a basic unit of the inverted-T-shaped retaining wall, the flexural rigidity and durability provided by an original high-strength steel bar or prestress system are fully utilized, and high value-added conversion of building solid waste is achieved. A wing plate of the T-shaped section beam serves as a base of the retaining wall, provides vertical support and resists overturning moment. The beam rib plate serves as a wall body and directly bears lateral [1] soil pressure from filling soil behind the wall. In this way, the problems that in the traditional retaining wall building process, resource consumption is large, the construction period is long, and resource waste is caused by low-value treatment of waste bridge components are solved. Meanwhile, the multiple first prefabricated splicing pieces are continuously arranged in the line trend, a linear soil retaining structure is formed, and good overall stability and space continuity are achieved. The whole structure is convenient for mechanical construction, the field operation time is shortened, and the engineering construction efficiency is improved.

This invention relates to a frame-type roadbed retaining structure, belonging to the fields of geotechnical engineering and structural engineering. It includes a frame structure comprising single rows of anti-slide piles on both sides of the road and longitudinal frame beams connected to the anti-slide piles along the road's extension direction, as well as transverse frame beams connected to the anti-slide piles along the road's width direction. The transverse frame beams include a top transverse frame beam located at the top of the road and a bottom transverse frame beam located below the road surface. Retaining slabs and floor slabs are respectively provided on both sides and the top of the frame structure. A rockfall impact buffer layer is provided on the floor slab at the top of the frame structure. This invention can be used for semi-cut roadbed slopes and fully cut roadbed slopes, primarily addressing the impact of large lateral earth pressure, landslide thrust, and rockfall impact loads on the road.

The present application relates to the field of drainage ditch, disclose a kind of combined roadbed side ditch construction method, comprising the following steps: step one, two groups of prefabricated side plate are inserted into soil body;Step two, excavate soil body between two groups of prefabricated side plate;Step three, set bottom plate between two groups of prefabricated side plate;Step four, lay cover plate on the upper end of two groups of prefabricated side plate.Not do foundation pit support, without pouring side plate on site, while ensuring resistance to lateral earth pressure, to achieve smooth drainage, reliable quality, reduce investment, reduce land occupation and meet the requirements of industrialized construction.

The application discloses a kind of state-related sand static earth pressure coefficient calculation method considering particle size and compactness.The method comprises the following steps: obtaining the state parameter of the sand sample to be measured, the state parameter includes the compactness parameter reflecting the compactness of the sand sample to be measured, and the particle size parameter reflecting the particle size;Based on the compactness parameter, the peak friction angle of the sand sample to be measured is determined by a preset friction angle growth equation;Based on the peak friction angle and the particle size parameter, the static earth pressure coefficient of the sand sample to be measured is calculated by a preset static earth pressure representation model.The application overcomes the technical limitations of traditional single-variable empirical formula, effectively couples the particle size effect and state correlation in soil mechanics response, and significantly improves the calculation accuracy of static lateral earth pressure under complex sand foundation conditions.

The application provides a prediction method and a measuring device for the relationship between lateral earth pressure and displacement of swelling soil. When measuring the lateral earth pressure of swelling soil under the condition of no displacement, a fixed block is arranged in the test device, a gradient initial constant vertical pressure is applied to the swelling soil sample for different tests, the swelling soil sample suction is gradually reduced to 0 after the sample is stable; when measuring the lateral earth pressure of swelling soil under the condition of lateral displacement, a plurality of horizontal elastic members and a plurality of horizontal displacement meters are arranged in the test device, a gradient initial constant vertical pressure is applied to the swelling soil sample for different tests, the swelling soil sample suction is gradually reduced to 0 after the sample is stable, the type of the plurality of horizontal elastic members is changed, and the test is repeated. Through fitting the test result data, the parameter value of the specific formula is determined, and then the change relationship between the lateral earth pressure of swelling soil and the lateral displacement in the humidification process is predicted.

This invention belongs to the fields of tunnel engineering and geotechnical mechanics. It discloses a method for calculating the ultimate support force of the excavation face in fault fracture zones based on local instability. Through simulation tests of tunnel excavation in fault fracture zones, the local instability morphology of the excavation face was obtained. An improved conical instability model was proposed, which solved the problem of the difficulty in accurately estimating the lateral earth pressure coefficient and simplified the calculation. Based on the symmetry of the rotating body, a mechanical analysis was conducted to establish a method for calculating the ultimate support force of the tunnel excavation face in fault areas. The accuracy was verified by comparing with existing test results, and the influence of key factors such as cohesion, internal friction angle, and soil weight was analyzed.

The application discloses a multifunctional consolidation instrument for precisely measuring soil structure parameters. A pressure spout is arranged above a base, a rigid guard ring is arranged between the pressure spout and the base to support the pressure spout and the base, and a soil sample cavity is formed, a pair of piezoelectric bending elements are arranged on the circular bosses of the pressure spout and the base; a lower annular water-permeable stone is arranged on the top surface of the base in the soil sample cavity, and an upper annular water-permeable stone is arranged on the bottom surface of the pressure spout in the soil sample cavity, wherein the upper annular water-permeable stone is located directly above the lower annular water-permeable stone; a pair of piezoelectric bending elements are arranged on the inner walls of one side of the rigid guard ring, and two diaphragm pressure gauges are respectively arranged on the inner walls of the other two sides of the rigid guard ring. The shear wave velocity and the lateral earth pressure of the soil sample are directly measured, and the precise determination of the soil structure parameters is realized.

The invention discloses an opposite-pulling type reinforced earth retaining wall and a construction process thereof, belongs to the technical field of road retaining walls, and aims to solve the problem that in the prior art, a wall face is prone to nonlinear side bulging deformation due to the fact that lateral earth pressure borne by wall panels is large. The opposite-pulling type reinforced earth retaining wall comprises a foundation, a reinforced earth filling area, a composite panel, a cap stone and a side face foundation. The foundation, the reinforced soil filling area and the cap stone are sequentially stacked from bottom to top, the composite panel and the side face foundation are arranged on the two sides of the reinforced soil filling area, and the side face foundation is located below the composite panel. The reinforced soil filling area comprises opposite-pulling rib materials and filler layers which are alternately stacked; the composite panel comprises a plurality of panel sets which are sequentially connected in a stacked mode from bottom to top, and each panel set comprises an outer layer, a panel pressure reduction layer located on the inner side of the outer layer and a composite reinforcing net wrapping the panel pressure reduction layer. The construction method can be used for constructing the opposite-pulling type reinforced earth retaining wall.

The present application relates to the technical field of tunnel, and provides a tunnel portal section structure suitable for steep terrain and a construction method thereof, wherein the steep rock-soil body is vertically excavated in steps through the upward slope, the upward slope is supported from top to bottom by the soil nailing wall while being excavated, the box culvert main body, the column assembly and the joist assembly are constructed, the adjacent bridge, the box culvert main body and the joist assembly which have been constructed are used as the construction platform, the portal wall and the arch on both sides of the tunnel are constructed, the pipe shed is constructed based on the arch, the second backfill space is backfilled to form the second backfill layer, the shed-hole assembly is constructed, the tunnel underground is constructed, and the construction of the tunnel portal section structure is completed. The double-layer frame structure can solve the foundation of the upper shed-hole assembly, provide a passage for the lower existing low-grade road, be used for the adjacent bridge and abutment, the upper backfill of the box culvert to the top surface of the joist can provide a construction platform for the tunnel portal, can resist the lateral earth pressure of the mountain, and has high construction safety.

The application discloses a kind of in situ static lateral earth pressure testing device and testing method, testing device includes: test pile, up and down push rod, conical wedge, sensor push rod, earth pressure cell, step screw and handle, hollow column that can determine test position is equipped in test pile, up and down push rod is arranged in hollow column, conical wedge is arranged between two up and down push rod, one end of sensor push rod is connected with earth pressure cell, the other end passes through hollow column, earth pressure cell is arranged in the side of test pile, handle is connected with up and down push rod and step screw.Handle rotates, make step screw synchronous up and down movement, simultaneously drive up and down push rod up and down movement, make conical wedge on up and down push rod extrude sensor push rod, sensor push rod moves outward and pushes earth pressure cell into cohesive soil, to meet the demand of testing soil static lateral pressure.