CN202247966U - Model test device for simulating pile-supported embankment under complex load condition - Google Patents
Model test device for simulating pile-supported embankment under complex load condition Download PDFInfo
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- CN202247966U CN202247966U CN2011202645968U CN201120264596U CN202247966U CN 202247966 U CN202247966 U CN 202247966U CN 2011202645968 U CN2011202645968 U CN 2011202645968U CN 201120264596 U CN201120264596 U CN 201120264596U CN 202247966 U CN202247966 U CN 202247966U
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Abstract
The utility model discloses a model test device for simulating a pile-supported embankment under the complex load condition. The device comprises a test groove (7), and a soft soil layer (1), an embankment filler (2) and a pile (5) with a pile cap (6) which are arranged in the test groove (7), wherein a loading system (3) is divided into a static load loading system and a dynamic load loading system and is an electromagnetic vibration exciter loading system; a settlement gauge is embedded into the embankment filler (2); a strain gauge or a micro tension gauge is embedded into a reinforcing material (4); a strain sheet is attached to a side slot of the pile (5); and soil pressure gauges are embedded into the upper part and the lower part of the pile cap (6) and a soil body on the middle part of the embankment filler (2). The model test device has the advantages that: the rule of deformation and stress distribution in a foundation can be analyzed under different relative displacement conditions under the action of different loads, and a working mechanism of the pile-supported embankment is obtained.
Description
Technical field
The utility model relates to a kind of model test apparatus in the foundation treatment technology field in the highway construction, pile formula embankment model test apparatus under particularly a kind of Simulation of Complex loading condition.
Background technology
China is vast in territory, complicated geological condition, and it is one of key issue during highway (railway) is built that special foundation is handled.Speedway (railway) ground that is built in the southeastern coastal areas often runs into the unfavorable geological condition of saturated soft clay.Physics, the mechanical property of weak soil are very poor, have characteristics such as high-moisture, high-compressibility, low-intensity, strong constitutive property, in engineering practice, must take effective method for processing foundation to punish.Pile formula embankment is fast because of its speed of application, construction quality is easy to control, sedimentation and settlement after construction is little and handle outstanding advantages such as the degree of depth is big in newly-built Expressway Ground Improvement, highway widening project and high-speed railway ground are handled, obtains more application; But at present the theoretical research of this problem is also lagged behind the needs of engineering practice; Especially the embankment pile is carried and is demanded analysing in depth research above the method for designing of characteristic, embankment deformation rule and system urgently under action of traffic loading, and model testing is the important means of carrying out this respect research.
Pile formula embankment is normal to adopt following form: an independently pile cover is annotated in the stake top casting in rigid pile, increases the area that bears the embankment load, and the soil arching effect of most of load through wherein is delivered to pile body, is delivered to down in the soil layer for sleeping in again; In order as much as possible pile spacing to be widened, top banket and the stake top between can be provided with one or more layers horizontal material with more Load Transfer to stake, this system form also has the scholar to be referred to as stake-net formula composite foundation or two-way composite foundation.
Pile formula embankment is under traffic loading and embankment deadweight effect; The differential settlement of the inter-pile soil top soil body and the pile cover top soil body can make the interior embankment fill material generation of certain limit stresses re-distribution on the top horizontal plane; Big principal direction of stress deflects and is roughly parallel to the dome-shaped chain line between adjacent two pile covers; Thereby with the embankment fill material compacting in this arch area, form the densification housing of arcuation one by one, with the embankment weight transmitting on a part of inter-pile soil top on pile cover.This phenomenon promptly is " soil arching effect " in the pile formula embankment.
Terzaghi has studied the plane soil arching effect the earliest, " soil arching effect " phenomenon that the employing valve has encircleed verification experimental verification.Analyze " soil arching effect ", at first must confirm the arch axis shape of soil arch and the geometrical characteristic parameter (sphere of action, profile and size etc.) of donor, it is the main stress bar streamline that is similar to catenary that Handy depicts arch first.At present the hypothesis to native arch shape mainly contains following several kinds: the plane soil arch model of Terzaghi, Marston etc. the wealthy promise husband's of semicircle model, Pu Luotuoqiya dome theory and the hemispherical model of Hewlett&Randolph etc. of wedge shape soil arch theory, Low etc. of heavy face computation model, Carlsson.Based on above basic assumption, some scholars improve and revise above-mentioned soil arch theory.Like the quick grade of Chen Yun embankment stress balance in the single pile equivalent process scope, improved the space soil circumpolar limit analytical method of Hewlett; Fringe conditions when the Chen Fu congruence appears at the stake top to plasticity point under the soil arching effect of Hewlett space has been done improvement, the native load share ratio calculating formula of stake after being improved.
Model testing and on-the-spot test are the most effectively one of means of research pile formula embankment work proterties, but field trial is difficult to obtain comprehensive, the overall process work proterties data of pile formula embankment because of its limitation.Many scholars study pile formula embankment soil arching effect through indoor model test, have obtained great successes.Hewlett&Randolph through model investigation the space soil arching effect in the embankment; And set up the analytic method of finding the solution soil arching effect based on limit equilibrium theory; But its test and theoretical calculation method are not considered the effect of horizontal bed course in the embankment, do not analyze the deformation characteristics of pile formula embankment yet; Low etc. have made plane soil arching effect experimental rig, have studied the influence to soil arching effect of depth of fill, stake case bay, but have related to the influence of embankment distortion to the soil arching effect proterties; Orianne etc. adopt the similar experimental rig with Low etc., the soil arching effect that adopted the analogy investigation of materials, but analogy material and actual embankment fill material differ greatly, so test the gained the possibility of result and be difficult to direct application; Zhan Yongxiang etc. have carried out stake plated construction roadbed dynamic test, but testing program is different from the actual form of pile formula embankment.
The utility model content
To the defective of existing model test apparatus, the utility model provides pile formula embankment model test apparatus under a kind of Simulation of Complex loading condition.
To achieve these goals, the measure taked of the utility model is:
Pile formula embankment model test apparatus under a kind of Simulation of Complex loading condition; Comprise weak soil layer, the embankment fill material of test flume and test flume set inside and contain the stake of pile cover; Insert some the weak soil layer above be filled with embankment fill material, be provided with reinforcement material in the embankment fill material, the top of embankment fill material is provided with loading system; Loading system is divided into dead load loading system and dynamic load loading system; Loading system is the electromagnetic actuator loading system, is embedded with settlement gauge in the embankment fill material, is embedded with strain meter or miniature spring meter in the reinforcement material; Post foil gauge in the side fluting of stake, all be embedded with earth pressure gauge in the bottom of pile cover top, pile cover and the embankment fill material middle part soil body;
The bottom of said stake is provided with control spring;
Said pile cover is an assembling;
Said embankment fill material is formed by the sand layering spreading compacting through screening;
The material of said test flume is a clear glass;
The material of said stake and pile cover is an organic glass;
The material of said weak soil layer is weak soil or rigid plastics foam.
The beneficial effect of the utility model: can analyze under the different relative displacement conditions, under different load actions, the distortion and the rule of stress distribution in the ground obtain the working mechanism of pile formula embankment.
Description of drawings
The structural representation of Fig. 1, the utility model device;
The weak soil layer vertical view of Fig. 2, the utility model device.
The specific embodiment
Pile formula embankment model test apparatus under a kind of Simulation of Complex loading condition comprises weak soil layer 1, the embankment fill material 2 of test flume 7 and test flume 7 set inside and contains the stake 5 of pile cover 6, inserts some 5 weak soil layer 1 above be filled with embankment fill material 2; Be provided with reinforcement material 4 in the embankment fill material 2, the top of embankment fill material 2 is provided with loading system 3, and loading system 3 is divided into dead load loading system and dynamic load loading system; Loading system 3 is the electromagnetic actuator loading system; Apply the cyclic loading of different frequency, different amplitudes, the load plate is set, lay above and load track at the embankment end face; Simulate the effect of dynamic load more truly; Be embedded with settlement gauge in the embankment fill material 2, can the operating mode under the different relative displacement conditions be made an experiment, be embedded with strain meter or miniature spring meter in the reinforcement material 4; Post foil gauge in the side fluting of stake 5; Can be through the adjustment spring rate, simulation end bearing pile and two kinds of stake types of friction pile all are embedded with earth pressure gauge in the bottom of pile cover 6 tops, pile cover 6 and the embankment fill material 2 middle part soil bodys; The bottom of said stake 5 is provided with control spring 8; Said pile cover 6 is an assembling, can change the test of the different operating modes of size simulation; Said embankment fill material 2 is formed by the sand layering spreading compacting through screening; The material of said test flume 7 is a clear glass, is convenient to the observation distortion; The material of said stake 5 and pile cover 6 is an organic glass; The material of said weak soil layer 1 is weak soil or rigid plastics foam.
During test; Can apply static load and cycle period load respectively to transposition; Analyze end bearing pile and friction pile pile formula embankment system under the different operating modes; The settling characteristics of typical section in the test embankment center soil body vertical stress regularity of distribution and the embankment, the variation of stress of the soil body and inter-pile soil body about the observation pile cover; Measure the stressed and deformation characteristic of material; The distribution characteristics of observation pile side resistance; Study soil arching effect, bearer properties and the deformation behaviour of embankment under friction pile and the end bearing pile situation respectively.
The beneficial effect of the utility model: can analyze under the different relative displacement conditions, under different load actions, the distortion and the rule of stress distribution in the ground obtain the working mechanism of pile formula embankment.
Those skilled in the art's simple change and replacement all are within the protection domain of the utility model in this area.
Claims (7)
1. pile formula embankment model test apparatus under the Simulation of Complex loading condition; Comprise weak soil layer (1), the embankment fill material (2) of test flume (7) and test flume (7) set inside and contain the stake (5) of pile cover (6); Insert some stake (5) weak soil layer (1) above be filled with embankment fill material (2), be provided with reinforcement material (4) in the embankment fill material (2), the top of embankment fill material (2) is provided with loading system (3); It is characterized in that: loading system (3) is divided into dead load loading system and dynamic load loading system; Loading system (3) is the electromagnetic actuator loading system, and embankment fill material is embedded with settlement gauge in (2), is embedded with strain meter or miniature spring meter in the reinforcement material (4); Post foil gauge in the side fluting of stake (5), all be embedded with earth pressure gauge in the bottom of pile cover (6) top, pile cover (6) and embankment fill material (2) the middle part soil body.
2. pile formula embankment model test apparatus under a kind of Simulation of Complex loading condition according to claim 1 is characterized in that: the bottom of said stake (5) is provided with control spring (8).
3. pile formula embankment model test apparatus under a kind of Simulation of Complex loading condition according to claim 1 is characterized in that: said pile cover (6) is an assembling.
4. according to pile formula embankment model test apparatus under the described a kind of Simulation of Complex loading condition of arbitrary claim in the claim 1～3, it is characterized in that: said embankment fill material (2) is formed by the sand layering spreading compacting through screening.
5. pile formula embankment model test apparatus under a kind of Simulation of Complex loading condition according to claim 4, it is characterized in that: the material of said test flume (7) is a clear glass.
6. pile formula embankment model test apparatus under a kind of Simulation of Complex loading condition according to claim 5 is characterized in that: the material of said stake (5) and pile cover (6) is an organic glass.
7. pile formula embankment model test apparatus under a kind of Simulation of Complex loading condition according to claim 6 is characterized in that: the material of said weak soil layer (1) is weak soil or rigid plastics foam.
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| CN102628767A (en) * | 2012-03-23 | 2012-08-08 | 河海大学 | Device and method for testing mechanical properties of pile-soil contact surface |
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| CN103852570A (en) * | 2014-03-18 | 2014-06-11 | 华侨大学 | Novel test method of cantilever pile soil arch effect |
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