CN108978735A - The model assay systems and method that research sediment influences soft coal roadway bearing capacity - Google Patents
The model assay systems and method that research sediment influences soft coal roadway bearing capacity Download PDFInfo
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- CN108978735A CN108978735A CN201810415840.2A CN201810415840A CN108978735A CN 108978735 A CN108978735 A CN 108978735A CN 201810415840 A CN201810415840 A CN 201810415840A CN 108978735 A CN108978735 A CN 108978735A
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D33/00—Testing foundations or foundation structures
Abstract
The present invention provides a kind of model assay systems that research sediment influences soft coal roadway bearing capacity and method, including modelling system, model loading system and monitoring system, the modelling system includes the model casing for filling softrock-like material Yu embedded rock pile analog material, connect with pvc pipe that form reserved embedded rock pile hole and sealed bottom and with the pvc pipe so that the welding brandreth for being fixed on corresponding position of the pvc pipe vertically in the softrock-like material, the embedded rock pile analog material forms embedded rock pile in the embedded rock pile hole, the model loading system includes load plate, the top that the load plate is set to the embedded rock pile is used to apply vertical load to the top of the embedded rock pile, the monitoring system is set at the top of the embedded rock pile between the load plate, including for monitoring institute State load plate be applied to the embedded rock pile load load transducer and displacement sensor for monitoring embedded rock pile displacement.
Description
Technical field
The present invention relates to Pile Bearing Capacity physical experiments fields more particularly to a kind of research sediment to the embedding rock of soft rock
The model assay systems and method that pile bearing capacity influences.
Background technique
Cast-in-situ bored pile in the construction process, can not be fully erased due to the limitation of construction equipment, technology and technological level
Pile bottom sediment, therefore will cause bearing capacity of pile foundation and occur reducing to some extent, threaten the safety of pile foundation structure.Stake bottom exists
The cast-in-situ bored pile that design requirement is not achieved in sediment and bearing capacity of pile foundation is known as sediment Defect Piles.Sediment Defect Piles are carried at present
The research method of characteristic includes on-the-spot test, numerical simulation, model test method etc..And on-the-spot test method will cause resource pole
Big waste, and it is not easy to detection sediment thickness；With the development of computer modeling technique, a large amount of numerical simulation software gushes
It is existing, although can more intuitively obtain the ess-strain rule of stake and rock mass using numerical simulation technology, its calculated result
Correctness, reliability are often difficult to ensure that this makes model test method become inspection and corrects the important of numerical simulation calculation
Means.
Affecting laws of the sediment to soft coal roadway bearing capacity are studied by model test method, can be overcome existing
Field test is time-consuming and laborious, influences the disadvantages of working normally order, the wasting of resources, and then provides section for the research achievement of numerical simulation
Reference and verifying, data obtained can be used for instructing the control of pile bottom sediment thickness in practice of construction, realization again
As a result the analysis of combination of qualitative and quantitative analysis, thus have great theoretical and practical significance.
Pile foundation model test multiselect takes organic glass stick simulating single pile at present, and loading device is mostly that hand-hydraulic is very heavy
Top, these will cause test result and large error actually occur.The production of model, the utilization of effective monitoring method are models
Difficulties in test restrict the application of pile foundation model test, influence to obtain sediment to soft coal roadway bearing capacity
Model test expected result, it is necessary to develop it is a set of meet condition of similarity, can more true simulation stake contacted with rock mass and
It can reduce the model test method and system of monitoring systematic error.
Summary of the invention
In view of this, the embodiment provides one kind can overcome the difficult point of model test, can satisfy it is similar
Condition, can more true simulation stake contact and can reduce with rock mass monitoring systematic error research sediment to soft coal roadway
The model assay systems and method that bearing capacity influences.
The embodiment of the present invention provides a kind of model assay systems that research sediment influences soft coal roadway bearing capacity, packet
Modelling system, model loading system and monitoring system are included, the modelling system includes for filling the similar material of soft rock
Material with the model casing of embedded rock pile analog material, in the softrock-like material with form reserved embedded rock pile hole and bottom
The pvc pipe and connect with the pvc pipe so that the welding brandreth for being fixed on corresponding position of the pvc pipe vertically, institute that portion seals
It states embedded rock pile analog material and forms embedded rock pile in the embedded rock pile hole, the model loading system includes load plate, described
The top that load plate is set to the embedded rock pile is used to apply vertical load to the top of the embedded rock pile, and the monitoring system is set to
At the top of the embedded rock pile between the load plate, including the load for being applied to the embedded rock pile for monitoring the load plate
Load transducer and the displacement sensor being displaced for monitoring the embedded rock pile.
Further, the model casing includes rib frame and panel, and the rib frame is made of angle steel, and the panel has 5
And be made of timber, 5 panels are embedded in the rib frame and surround a upper end under the fixation of the rib frame and open
The body structure of mouth.
Further, the model loading system includes reaction frame, is equipped with below the reaction frame and places the model casing
Placement space, the horizontal top for being set to the reaction frame and being located at the placement space of the load plate, the model
Case is placed in the placement space, and when doing soft coal roadway bearingtest, a load pier is set to the embedded rock pile, and passes through institute
It states monitoring system to connect with the load plate, the center of the load plate, the load pier and the corresponding embedded rock pile is located at
On same vertical line.
Further, the softrock-like material multilayer in the model casing is filled, the similar material of every layer of soft rock
Expect that thickness is identical, the embedded rock pile analog material filled in the embedded rock pile hole has multilayer, every layer of soft rock phase
It is identical like material thickness, and the thickness of every layer of softrock-like material is greater than the thickness of every layer of softrock-like material.
It further, further include that there is various sizes of first compacting hammer and the second compacting hammer, the first compacting hammer is used
In being compacted every layer of softrock-like material, the second compacting hammer is for being compacted every layer of embedded rock pile analog material.
It further, further include sediment simulation material, when doing load-settling test of sediment single pile, the sediment mould
Quasi- material is located at the bottom of the embedded rock pile hole, and the embedded rock pile analog material fills on the sediment simulation material,
The sediment simulation material is softrock-like material clast.
The embodiment of the present invention provides a kind of model test method that research sediment influences soft coal roadway bearing capacity,
It is characterized in that, includes the following steps:
S1: production modelling system, the modelling system includes model casing, softrock-like material and embedded rock pile phase
Like material, the softrock-like material is filled in the model casing, and the softrock-like material in the model casing
In reserve one or more embedded rock pile hole；
S2: if doing load-settling test of sediment single pile, the modelling system further includes sediment simulation material,
The sediment simulation material is filled in embedded rock pile hole bottom first, then it is described have institute is filled on sediment simulation material
Embedded rock pile analog material is stated, until filling to rock stake holes hole；It, will if doing load-settling test of no sediment single pile
The embedded rock pile analog material is filled in the embedded rock pile hole until filling to rock stake holes hole；
S3: the load-settling test for having sediment single pile or lotus without sediment single pile are carried out using universal testing machine
Load-settling test draws the load-subsidence curve for having sediment single pile or load-subsidence curve without sediment single pile.
Further, in S1, the softrock-like material is filled when the model casing, it is first that the soft rock is similar
Material is divided into several layers, and every layer is the integer greater than 0 with a thickness of n, n, successively fills the softrock-like material, and pressed with first
Real hammer hammers the softrock-like material for being repeatedly located at the model casing top layer on unit area, until the total thickness filled
Degree is 3n, and the pvc pipe of one or more sealed bottoms is placed in the upper surface of the softrock-like material, with welding brandreth
The fixed pvc pipe so that the pvc pipe it is vertical be fixed on corresponding position, continue successively to fill similar with the soft rock is hammered
Material extracts the pvc pipe, the embedding rock after the softrock-like material initial set until filling to the model casing
Stake holes hole is formed.
Further, in S2, the embedded rock pile analog material is divided into several layers first, every layer with a thickness of 2n, if doing
There is load-settling test of sediment single pile, fills the certain thickness sediment simulation material in the bottom of the embedded rock pile hole
Material, then the embedded rock pile analog material is successively filled on the sediment simulation material, it is similar often to fill one layer of embedded rock pile
Material is hammered the embedded rock pile phase for being repeatedly located at embedded rock pile hole top layer by the second compacting hammer on unit area
Like material, until the embedded rock pile analog material is filled to the embedded rock pile hole, embedded rock pile described in natural curing is similar
Material is until it forms embedded rock pile；If doing load-settling test of sediment single pile, in the heavy embedded rock pile hole successively
The embedded rock pile analog material is filled, one layer of embedded rock pile analog material is often filled, by the second compacting hammer in unit area
Upper hammering is repeatedly located at the embedded rock pile analog material of embedded rock pile hole top layer, until the embedded rock pile analog material
It fills to the embedded rock pile hole, embedded rock pile analog material described in natural curing is until it forms embedded rock pile.
Further, the universal testing machine includes model loading system and monitoring system, model load system
System includes reaction frame and the horizontal load plate being set on the reaction frame, is equipped with below the reaction frame and places the model
The placement space of case, the load plate are located at the top of the placement space, will fill the softrock-like material and formation
There is the model casing of the embedded rock pile to be placed in the placement space, it is described in the top of embedded rock pile setting load pier
Load pier is connect by the monitoring system with the load plate, the load plate, the load pier and the corresponding embedding rock
The center of stake is located on same vertical line, and the monitoring system includes the lotus for being applied to the embedded rock pile for monitoring the load plate
The load transducer of load and the displacement sensor being displaced for monitoring the embedded rock pile；Using the load plate in the embedded rock pile
Stake top is further applied load, and load loads aN by the way of hierarchical loading every time, keeps bs, and so on, under this grade of load
The pile head settlement rate of the embedded rock pile is more than that 5 times of higher level's rate of settling or total settlement reach predetermined depth, then stops trying
It tests, load-subsidence curve of every pile is exported after test, a, b are the integer greater than zero.
The technical solution that the embodiment of the present invention provides has the benefit that
(1) the modelling system can produce severe big, intensity and deformation modulus is low, elastoplasticity is similar to prototype
Small scale embedded rock pile model, than more fully, the interaction rule of really simulation embedded rock pile and soft rock, and mould
Type is easy to make, low in cost, strong operability, and the production for similar small scale pile foundation model provides reference.
(2) softrock-like material and the embedded rock pile analog material is selected to be filled, then common consolidation, wherein
The softrock-like material is consolidated into rock mass, and the embedded rock pile analog material is consolidated into embedded rock pile, to simulate the embedded rock pile
Practical with rock mass contacts, and more meets engineering reality.
(3) the higher universal testing machine of service precision loads automatically and records displacement, avoids manual operation, people
Large error caused by part work and part study number.
(4) pile bottom sediment is simulated using softrock-like material clast (sediment simulation material), clast is compressible, and by stake
There is certain bearing capacity after body compacting, be more in line with the characteristic of sediment in Practical Project.
(5) present invention with Bored Pile of Bridge engineering it is practical be support, can develop pile bottom sediment to soft coal roadway carry
The Influencing Mechanism of characteristic, the model investigation for pile foundation engineerings such as science of bridge building, hydraulic and hydroelectric engineering, architectural engineerings are borrowed
Mirror.
Detailed description of the invention
Fig. 1 is the schematic diagram of model casing of the invention；
Fig. 2 is the schematic diagram that pvc pipe is embedded in model casing of the invention；
Fig. 3 is the schematic diagram of compacting hammer of the invention；
Fig. 4 is the schematic diagram for the model assay systems that research sediment of the invention influences soft coal roadway bearing capacity；
Fig. 5 is pile top load-subsidence curve under different sediment thicknesses.
Specific embodiment
To make the object, technical solutions and advantages of the present invention clearer, below in conjunction with attached drawing to embodiment party of the present invention
Formula is further described.
Referring to FIG. 4, the embodiment provides a kind of moulds that research sediment influences soft coal roadway bearing capacity
Type pilot system, including modelling system, model loading system and monitoring system 6.The embodiments of the present invention also provide one
The model test method that kind research sediment influences soft coal roadway bearing capacity, this method is using the studies above sediment to soft rock
The model assay systems that embedded rock pile bearing capacity influences are come the method that carries out model test.
Please refer to Fig. 1, Fig. 2 and Fig. 4, the modelling system include softrock-like material, embedded rock pile analog material and
Softrock-like material clast further includes model casing 8, the pvc pipe 3 of sealed bottom and welding brandreth 1.The model casing 8 is for filling out
The softrock-like material and the embedded rock pile analog material are built, and makes softrock-like material material similar with the embedded rock pile
Material distinguishes natural curing into rock mass and embedded rock pile wherein, contacts to simulate embedded rock pile with the practical of rock mass.The pvc pipe 3
For being embedded to when filling the softrock-like material in the softrock-like material, after extracting the pvc pipe 3, in the mould
One or more embedded rock pile hole can be formed in the softrock-like material in molding box 8, the embedded rock pile hole is for institute
It states embedded rock pile analog material to fill, i.e., the described embedded rock pile is formed in the embedded rock pile hole.The welding brandreth 1 is for solid
The fixed pvc pipe 3 so that the pvc pipe 3 it is vertical be fixed on corresponding position, and make the pvc pipe 3 in the similar material of the soft rock
Material remains vertical state during filling.
Referring to FIG. 4, the model loading system and the monitoring system 6 are integrated in universal testing machine, described ten thousand
Can Material Testing Machine be UTM5105 universal testing machine, the model loading system includes reaction frame 4 and load plate 5, described
Be equipped with the placement space for placing the model casing 8 below reaction frame 4, the load plate 5 it is horizontal be set to the reaction frame 4 and
Positioned at the top of the placement space, the model casing 8 is placed in the placement space.Do soft coal roadway bearingtest
When, a load pier 7 is set at the top of the embedded rock pile, and is connect by the monitoring system 6 with the load plate 5, the load
The center of plate 5, the load pier 7 and the corresponding embedded rock pile is located on same vertical line.
The monitoring system 6 includes the load sensing for being applied to the load of the embedded rock pile for monitoring the load plate 7
Device and the displacement sensor being displaced for monitoring the embedded rock pile.The embedded rock pile is monitored by the monitoring system 6 to bear
Vertical load and the displacement that moves down of the embedded rock pile stake top.The universal testing machine hangs down according to what the embedded rock pile was born
Load-subsidence curve is drawn out in the displacement moved down to load and the embedded rock pile stake top automatically.
The specific steps for the model test method that research sediment of the present invention influences soft coal roadway bearing capacity are such as
Under:
S1: it makes the modelling system: including making the model casing 8, being filled using the softrock-like material
The model casing 8 buries one or more described pvc pipe 3 when filling the model casing 8 using the softrock-like material
The softrock-like material is extracted in the softrock-like material, after filling forms one or more embedded rock pile
Hole.
It is specific:
S1.1: according to embedded rock pile prototype and experimental condition, the model test likelihood ratio is determined, and then according to the model test
The likelihood ratio, prepare the softrock-like material, the embedded rock pile analog material and the softrock-like material clast, it is described soft
Lithofacies are like material chips, that is, sediment simulation material.
S1.2: while according to the likelihood ratio of the model test, the size of the reasonable model casing 8 is designed,
And design the position etc. of the diameter and length and the embedded rock pile of the embedded rock pile in the model casing 8.
Referring to FIG. 1, S1.3: because of the softrock-like material, embedded rock pile analog material material similar with the soft rock
The density of material debris is larger, so the larger likelihood ratio should be chosen, while the model casing 8 should also minimize own wt, because
This uses rib frame+plank structure, i.e., the described model casing 8 includes rib frame 81 and panel 82, and the rib frame 81 is made of angle steel, institute
Panel 82 is stated with 5 and is made of timber, 5 panels 82 are embedded in the rib frame 81 and in the rib frame 81
The body structure of a upper end opening is surrounded under fixation.The equal leg angle for choosing 25 × 25 × 3mm is cut out, welds, and makes
The profile of the model casing 8 out, the profile, that is, rib frame 81.
The bilateral symmetry welding angle steel at 1/2 height of the model casing 8, angle steel herein are handle 83, the handle
83 for easily moving the model casing 8, while the handle 83 has the function of reinforcing the model casing 8.
Referring to FIG. 2, S1.4: the softrock-like material being filled when the model casing, first by the soft rock phase
It is divided into several layers like material, every layer is the integer greater than 0 with a thickness of n, n, successively fills the softrock-like material, and with first
Compacting hammer 91 hammers the softrock-like material for being repeatedly located at the model casing top layer on unit area, until fill
Overall thickness is 3n, and the pvc pipe of one or more sealed bottoms is placed in the upper surface of the softrock-like material, with welding
The fixed pvc pipe 3 of brandreth 1 so that the pvc pipe 3 it is vertical be fixed on corresponding position, continue successively to fill and hammer described in
Softrock-like material extracts the pvc pipe after the softrock-like material initial set until filling to 8 top of model casing
3, the embedded rock pile hole is formed.
In the present embodiment, the model casing 8 is having a size of 360mm × 240mm × 450mm, the diameter of the embedded rock pile
20mm, length 300mm, n=50mm.
S2: if doing load-settling test of sediment single pile, the sediment simulation material is filled in described embedding first
Rock stake holes hole bottom, then it is described have the embedded rock pile analog material is filled on sediment simulation material, until fill to the rock
At the top of stake holes hole；If doing load-settling test of no sediment single pile, the embedded rock pile analog material is filled in the embedding rock
Stake holes hole is until fill to rock stake holes hole.
It is specific:
The embedded rock pile analog material is divided into several layers first, every layer with a thickness of 2n (i.e. 100mm).
If doing load-settling test of sediment single pile, certain thickness institute is filled in the bottom of the embedded rock pile hole
Sediment simulation material is stated, then successively fills the embedded rock pile analog material on the sediment simulation material, often fills one layer of institute
Embedded rock pile analog material is stated, multiple (about 5 times) is hammered on unit area by the second compacting hammer 92 and is located at the rock-embedded pile hole
The embedded rock pile analog material of hole top layer, until the embedded rock pile analog material is filled to the embedded rock pile hole,
Natural curing (maintenance 28 days or so) described embedded rock pile analog material is until it forms embedded rock pile.
If doing load-settling test of sediment single pile, the embedded rock pile is successively filled in the heavy embedded rock pile hole
Analog material often fills one layer of embedded rock pile analog material, is hammered repeatedly (about on unit area by the second compacting hammer 92
5 times) be located at embedded rock pile hole top layer the embedded rock pile analog material, until the embedded rock pile analog material fill to
At the top of the embedded rock pile hole, natural curing (maintenance 28 days or so) described embedded rock pile analog material is until it forms embedded rock pile.
Referring to FIG. 3, the first compacting hammer 91 and the second compacting hammer 92 have different rulers in the present embodiment
It is very little, and the first compacting hammer 91 and the second compacting hammer 92 are located at the opposite end of same hammer handle 93, first compacting
Hammer 91 is located at the bottom end of the hammer handle 93, basal diameter 50mm, and the second compacting hammer 92 is located at the top of the hammer handle 93
End, top surface diameter are 18mm, and the hammer handle 93 is 500mm long.
Please refer to Fig. 4 and Fig. 5, S3: using universal testing machine carry out the load-settling test for having sediment single pile or
Load-settling test of the person without sediment single pile draws the load-subsidence curve for having sediment single pile or the lotus without sediment single pile
Load-subsidence curve.
It is specific:
S3.1: institute is placed in the model casing 8 for being formed with the embedded rock pile by the softrock-like material is filled
Placement space is stated, the load pier 7 is set at the top of the embedded rock pile, makes the load plate 5, the load pier 7 and corresponds to
The center of the embedded rock pile be located on same vertical line.
S3.2: first adding the load of 10N on the embedded rock pile top using the load plate 5, check the load transducer and
Whether institute's displacement sensors work normally, and check errorless rear clearing, then start to load.
S3.2: load loads aN by the way of hierarchical loading every time, keeps bs, and so on, under this grade of load
The pile head settlement rate of the embedded rock pile is more than that 5 times of higher level's rate of settling or total settlement reach predetermined depth, then stops trying
It tests, load-subsidence curve of every pile is exported after test.
In the present embodiment, a=100, b=5, the predetermined depth are 2mm.
If there is load-settling test of sediment single pile, then load-the subsidence curve is the lotus for having sediment single pile
Load-subsidence curve；If load-settling test without sediment single pile, then load-the subsidence curve is no sediment single pile
Load-subsidence curve.
According to the load-influence of the subsidence curve research sediment to soft coal roadway bearing capacity.
Wherein, the load pier 7 includes top plate and bottom plate and the connecting column for connecting the top plate and the bottom plate, the top
Plate is arranged upward to abut with the monitoring system 6, and the bottom plate is arranged downward to be connect with the embedded rock pile contact, and the bottom plate is actually
It for the lower surface of the connecting column, is had the same diameter with the connecting column, the diameter of the top plate is greater than the connecting column
Diameter.It is preferred that the diameter of the top plate is 100mm, with a thickness of 100mm, the diameter of the bottom plate is 18mm, the connecting column
Length be 100mm.
Herein, the nouns of locality such as related front, rear, top, and bottom are to be located in figure with components in attached drawing and zero
Part mutual position defines, only for the purpose of expressing the technical solution clearly and conveniently.It should be appreciated that the noun of locality
Use should not limit the claimed range of the application.
In the absence of conflict, the feature in embodiment and embodiment herein-above set forth can be combined with each other.
The foregoing is merely presently preferred embodiments of the present invention, is not intended to limit the invention, it is all in spirit of the invention and
Within principle, any modification, equivalent replacement, improvement and so on be should all be included in the protection scope of the present invention.
Claims (10)
1. a kind of model assay systems that research sediment influences soft coal roadway bearing capacity, it is characterised in that: including model system
Make system, model loading system and monitoring system, the modelling system includes for filling softrock-like material and embedding rock
The model casing of stake analog material, in the softrock-like material with forming reserved embedded rock pile hole and sealed bottom
It pvc pipe and is connect with the pvc pipe so that the vertical welding brandreth for being fixed on corresponding position of the pvc pipe, the embedded rock pile
Analog material forms embedded rock pile in the embedded rock pile hole, and the model loading system includes load plate, and the load plate is set
It is used to apply vertical load to the top of the embedded rock pile in the top of the embedded rock pile, the monitoring system is set to the embedding rock
Between stake top portion and the load plate, including the load sensing for being applied to the load of the embedded rock pile for monitoring the load plate
Device and the displacement sensor being displaced for monitoring the embedded rock pile.
2. the model assay systems that research sediment influences soft coal roadway bearing capacity, feature exist as described in claim 1
In: the model casing includes rib frame and panel, and the rib frame is made of angle steel, and the panel has 5 and is made of timber,
5 panels are embedded in the rib frame and surround the body structure of a upper end opening under the fixation of the rib frame.
3. the model assay systems that research sediment influences soft coal roadway bearing capacity, feature exist as described in claim 1
In: the model loading system includes reaction frame, and the placement space for placing the model casing is equipped with below the reaction frame, described
The horizontal top for being set to the reaction frame and being located at the placement space of load plate, the model casing are placed in the placement
Space, when doing soft coal roadway bearingtest, one load pier be set to the embedded rock pile, and by the monitoring system with it is described
Load plate connection, the center of the load plate, the load pier and the corresponding embedded rock pile are located on same vertical line.
4. the model assay systems that research sediment influences soft coal roadway bearing capacity, feature exist as described in claim 1
In: filling the softrock-like material in the model casing has multilayer, and every layer of softrock-like material thickness is identical,
The embedded rock pile analog material filled in the embedded rock pile hole has multilayer, every layer of softrock-like material thickness phase
Together, and the thickness of every layer of softrock-like material be greater than every layer of softrock-like material thickness.
5. the model assay systems that research sediment influences soft coal roadway bearing capacity, feature exist as claimed in claim 4
In: it further include that there is various sizes of first compacting hammer and the second compacting hammer, the first compacting hammer is for being compacted described in every layer
Softrock-like material, the second compacting hammer is for being compacted every layer of embedded rock pile analog material.
6. the model assay systems that research sediment influences soft coal roadway bearing capacity, feature exist as described in claim 1
In: it further include sediment simulation material, when doing load-settling test of sediment single pile, the sediment simulation material is located at described
The bottom of embedded rock pile hole, the embedded rock pile analog material fill on the sediment simulation material, and the sediment simulates material
Material is softrock-like material clast.
7. a kind of model test method that research sediment influences soft coal roadway bearing capacity, which is characterized in that including walking as follows
It is rapid:
S1: production modelling system, the modelling system includes model casing, softrock-like material material similar with embedded rock pile
Material, the softrock-like material is filled in the model casing, and pre- in the softrock-like material in the model casing
Reserve one or more embedded rock pile hole；
S2: if doing load-settling test of sediment single pile, the modelling system further includes sediment simulation material, first
The sediment simulation material is filled in embedded rock pile hole bottom, then it is described have filled on sediment simulation material it is described embedding
Rock stake analog material, until filling to rock stake holes hole；It, will be described if doing load-settling test of no sediment single pile
Embedded rock pile analog material is filled in the embedded rock pile hole until filling to rock stake holes hole；
S3: the load-settling test for having sediment single pile or load-without sediment single pile are carried out using universal testing machine
Settling test draws the load-subsidence curve for having sediment single pile or load-subsidence curve without sediment single pile.
8. the model test method that research sediment influences soft coal roadway bearing capacity, feature exist as claimed in claim 7
In: in S1, the softrock-like material is filled when the model casing, is first divided into the softrock-like material several
Layer, every layer is the integer greater than 0 with a thickness of n, n, successively fills the softrock-like material, and with the first compacting hammer in unit plane
The softrock-like material for being repeatedly located at the model casing top layer is hammered in product, until the overall thickness filled is 3n, by one
Root or the pvc pipe of more root bottom parts sealing are placed in the upper surface of the softrock-like material, fix the PVC with welding brandreth
Manage so that the pvc pipe it is vertical be fixed on corresponding position, the softrock-like material is filled and hammered to continuation successively, up to filling out
It builds to the model casing, extracts the pvc pipe, the embedded rock pile hole, that is, shape after the softrock-like material initial set
At.
9. the model test method that research sediment influences soft coal roadway bearing capacity, feature exist as claimed in claim 8
In: in S2, the embedded rock pile analog material is divided into several layers first, every layer with a thickness of 2n, if doing the lotus of sediment single pile
Load-settling test fills the certain thickness sediment simulation material in the bottom of the embedded rock pile hole, then described heavy
The embedded rock pile analog material is successively filled on slag simulation material, one layer of embedded rock pile analog material is often filled, by second
Compacting hammer hammers the embedded rock pile analog material for being repeatedly located at embedded rock pile hole top layer on unit area, until institute
It states embedded rock pile analog material to fill to the embedded rock pile hole, embedded rock pile analog material described in natural curing is until its formation
Embedded rock pile；If doing load-settling test of sediment single pile, the embedded rock pile is successively filled in the heavy embedded rock pile hole
Analog material often fills one layer of embedded rock pile analog material, is hammered on unit area by the second compacting hammer and is repeatedly located at
The embedded rock pile analog material of embedded rock pile hole top layer, until the embedded rock pile analog material is filled to the embedding rock
At the top of stake holes hole, embedded rock pile analog material described in natural curing is until it forms embedded rock pile.
10. the model test method that research sediment influences soft coal roadway bearing capacity, feature exist as claimed in claim 9
In: the universal testing machine include model loading system and monitoring system, the model loading system include reaction frame and
The horizontal load plate being set on the reaction frame, the reaction frame lower section are equipped with the placement space for placing the model casing,
The load plate is located at the top of the placement space, will fill the softrock-like material and is formed with the embedded rock pile
The model casing is placed in the placement space, and in the top of embedded rock pile setting load pier, the load pier passes through described
Monitoring system is connect with the load plate, and the center of the load plate, the load pier and the corresponding embedded rock pile is located at same
On one vertical line, the monitoring system includes the load transducer for being applied to the load of the embedded rock pile for monitoring the load plate
With the displacement sensor for monitoring the embedded rock pile displacement；It is further applied load using the load plate in the embedded rock pile stake top,
Load loads aN by the way of hierarchical loading every time, keeps bs, and so on, such as the embedded rock pile under this grade of load
Pile head settlement rate is more than that 5 times of higher level's rate of settling or total settlement reach predetermined depth, then stops testing, after test
Load-subsidence curve of every pile is exported, a, b are the integer greater than zero.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810415840.2A CN108978735B (en) | 2018-05-03 | 2018-05-03 | The model assay systems and method that research sediment influences soft coal roadway bearing capacity |
Applications Claiming Priority (1)
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