CN105203735B - The implementation method of drying and watering cycle is carried out in model engineering in the case of soil body bearing load - Google Patents

The implementation method of drying and watering cycle is carried out in model engineering in the case of soil body bearing load Download PDF

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Publication number
CN105203735B
CN105203735B CN201510598878.4A CN201510598878A CN105203735B CN 105203735 B CN105203735 B CN 105203735B CN 201510598878 A CN201510598878 A CN 201510598878A CN 105203735 B CN105203735 B CN 105203735B
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sample
cover plate
upper cover
soil body
retainer ring
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CN105203735A (en
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吕海波
董均贵
徐云山
季春生
蒋熠
成果灯
常红帅
刘丽
王宗
王勇
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Guilin University of Technology
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Guilin University of Technology
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Abstract

The invention discloses the implementation method that drying and watering cycle is carried out in the case of soil body bearing load in a kind of model engineering.Setting carries out the device of drying and watering cycle in a kind of model engineering and includes nut, retainer ring, vertical rod, lower shoe, lower shoe osculum, cutting ring, right-angled intersection rib, upper cover plate and upper cover plate osculum in the case of soil body bearing load, vertical rod total length is fixedly linked with screw thread and with lower shoe;The upper end of right-angled intersection rib is bigger than retainer ring external diameter 1 centimetre on upper cover plate;Retainer ring internal diameter is slightly larger than cutting ring external diameter, is easy to cutting ring to be put into, and diagonal position sets four vertical slots on retainer ring ring wall, and vertical slot internal thread is mutually twisted with the screw thread of vertical rod, and nut inner thread is mutually twisted with the screw thread of vertical rod;The purpose that soil body drying and watering cycle experiment is realized in the case of precise control moisture content is reached using the device.Apparatus of the present invention material cheap and simple, easy to operate, simulation stressing conditions actually, are easily grasped close to engineering, are easy to engineering application.

Description

The implementation method of drying and watering cycle is carried out in model engineering in the case of soil body bearing load
Technical field
The invention belongs to Geotechnical Engineering experiment and engineering application technical field, the soil body holds in more particularly to a kind of model engineering By the implementation method that drying and watering cycle is carried out in the case of load.
Background technology
Drying and watering cycle acts on the properties such as intensity, the modulus on the soil body with significantly affecting, and soil body drying and watering cycle is also ground One of problem of engineering extensive concern.Currently for soil body drying and watering cycle process research mainly by large volume model experiment and Laboratory small volumes of sample experiment is carried out.And earth stress situation that current experimental technique is simulated it is actual with engineering differ compared with Greatly, it is primarily present following limitation:(1) sample drying and watering cycle process is carried out on direct shear apparatus, and moisture content is by after failure by shear Sample measurement, it is impossible to real-time precise control sample moisture content;Sample parcel is tight, and drying and watering cycle process is slow;(2) sample exists Without drying and watering cycle process is carried out under restrained condition, first make compared with bulk specimen, make cutting ring sample after the completion of drying and watering cycle again, to examination Sample forms repeatedly disturbance, influences experimental result.
The content of the invention
It is an object of the invention to provide the reality that drying and watering cycle is carried out in the case of soil body bearing load in a kind of model engineering Existing method, to solve the problems, such as to be proposed in above-mentioned background technology.
Concretely comprise the following steps:
(1) setting carries out the device of drying and watering cycle in a kind of model engineering in the case of soil body bearing load, including nut, solid Determine ring, vertical rod, lower shoe, lower shoe osculum, cutting ring, right-angled intersection rib, upper cover plate and upper cover plate osculum, vertical rod total length is attached There is screw thread and be fixedly linked with lower shoe;The upper end of right-angled intersection rib is bigger than retainer ring external diameter 1 centimetre on upper cover plate;In retainer ring Footpath is slightly larger than cutting ring external diameter, is easy to cutting ring to be put into, and diagonal position sets four vertical slots on retainer ring ring wall, vertical slot internal thread with it is vertical The screw thread of bar is mutually twisted, and nut inner thread is mutually twisted with the screw thread of vertical rod;Whole device material is that strength high density is small Duroplasts.
(2) the cutting ring sample of required moisture content is made according to planning of experiments, two-layer and sample etc. are respectively put in sample top and bottom Big silk quality gauze, to prevent grogs to be lost in, sample is put on lower shoe together with cutting ring.
(3) by upper cover plate cover alignment to sample, retainer ring is put on the right-angled intersection rib of upper cover plate through vertical rod, nut Rod end position is screwed to, the weight for weighing whole device is designated as M0.
(4) dial gauge is arranged on Magnetic gauge stand, the measuring head of dial gauge is arranged on the right-angled intersection rib of upper cover plate, And initial value is set, the vertical strain of sample is measured with this.
(5) the class of loading requirement according to planning of experiments, with counterweight, preloading applies pressure on upper cover plate, when sample is erected Compressed to load, retainer ring is to be subject to hoop constraint power with upper cover plate slide downward, now sample, is under pressure again, is simulated Engineering actual loading situation.
(6) simulate soil body dehydration process to be realized by controlling soil moisture content, allow soil body moisture freely to evaporate or auxiliary Speed is accelerated with electric fan blowing, the numerical value of dial gauge is recorded every a time for setting and is measured the weight of sample to calculate this When sample moisture content.
(7) when weighing, dial gauge is removed, nut is screwed to along vertical rod and is in close contact with retainer ring, to prevent from shedding counterweight Sample resilience after vertical load;The load on upper cover plate is unloaded, whole device weighing mass M 1 on balance is placed on, according to twice The difference weighed, i.e. M0-M1, calculate soil body moisture variable quantity, so as to calculate the water-cut variation situation of sample;Due to retainer ring Constraint, upper cover plate is unable to resilience, and, still in pressured state, whole process is in the absence of unloading for sample when weighing.
(8) when simulating soil body water absorption course, device is placed in the curing box of setting humidity, moisture is fully infiltrated into examination Sample;Record the numerical value of dial gauge and weighed with step (7) methods described every a time for setting and calculate the moisture content of sample, The purpose of soil body drying and watering cycle experiment is realized in the case of precise control moisture content so as to reach.
The preferred PEEK plastics of the small duroplasts of strength high density of the present invention.
The inventive method equipment therefor cheap and simple, easy to operate, it is actual, easily close to engineering that this method simulates stressing conditions Grasp, be easy to engineering application.
Brief description of the drawings
Fig. 1 is the retainer ring front view of use device in the embodiment of the present invention.
Fig. 2 is the retainer ring top view of use device in the embodiment of the present invention.
Fig. 3 is the upper cover plate and right-angled intersection rib front view of use device in the embodiment of the present invention.
Fig. 4 is the upper cover plate and right-angled intersection rib top view of use device in the embodiment of the present invention.
It is used for the schematic device of vertical strain testing in Fig. 5 embodiment of the present invention.
Marked in figure:1- nuts;2- retainer rings;3- vertical rods;4- lower shoes;5- lower shoe osculums;6- cutting rings;7- crosses Intersect rib;8- upper cover plates;9- upper cover plate osculums;10- dial gauges;11- Magnetic gauge stands;12- samples.
Specific embodiment
Presently preferred embodiments of the present invention is described in detail below in conjunction with accompanying drawing, so that advantages and features of the invention Can be more easy to be readily appreciated by one skilled in the art, apparent clearly be defined so as to be made to protection scope of the present invention.
Embodiment:
(1) setting carries out the device of drying and watering cycle in a kind of model engineering in the case of soil body bearing load, including nut 1, Retainer ring 2, vertical rod 3, lower shoe 4, lower shoe osculum 5, cutting ring 6, right-angled intersection rib 7, upper cover plate 8 and upper cover plate osculum 9, The total length of vertical rod 3 is fixedly linked with screw thread and with lower shoe 4;The upper end of right-angled intersection rib 7 is than the external diameter of retainer ring 2 on upper cover plate 8 It is big 1 centimetre;The internal diameter of retainer ring 2 is slightly larger than the external diameter of cutting ring 6, is easy to cutting ring 6 to be put into, and diagonal position sets four on the ring wall of retainer ring 2 Individual vertical slot, vertical slot internal thread is mutually twisted with the screw thread of vertical rod 3, and the internal thread of nut 1 is mutually twisted with the screw thread of vertical rod 3;Entirely Device material is PEEK plastics.
(2) the cutting ring sample 12 of required moisture content is made according to planning of experiments, the top and bottom of sample 12 are respectively put two-layer and tried The big silk quality gauze of the grade of sample 12, to prevent grogs to be lost in, sample 12 is put on lower shoe 4 together with cutting ring 6.
(3) by the cover alignment of upper cover plate 8 to sample 12, retainer ring 2 is put into the right-angled intersection rib 7 of upper cover plate 8 through vertical rod 3 On, nut 1 is screwed to the apical position of vertical rod 3, and the weight for weighing whole device is designated as M0.
(4) dial gauge 10 is arranged on Magnetic gauge stand, the measuring head of dial gauge 10 is arranged on the right-angled intersection of upper cover plate 8 On rib 7, and initial value is set, the vertical strain of sample 12 is measured with this.
(5) the class of loading requirement according to planning of experiments, with counterweight, preloading applies pressure on upper cover plate 8, when sample 12 Compressed by vertical load, with the slide downward of upper cover plate 8, now sample 12 is subject to hoop constraint power to retainer ring 2, and is pressed Power, simulates engineering actual loading situation.
(6) simulate soil body dehydration process to be realized by controlling soil moisture content, allow soil body moisture freely to evaporate, Mei Geyi The numerical value of the time record dial gauge 10 of individual setting simultaneously measures the weight of sample 12 to calculate the moisture content of now sample 12.
(7) when weighing, dial gauge 10 is removed, nut 1 is screwed to along vertical rod 3 and is in close contact with retainer ring 2, to prevent from shedding The resilience of sample 12 after counterweight vertical load;The load on upper cover plate 8 is unloaded, whole device is placed on weighing mass M 1 on balance, According to the difference weighed twice, i.e. M0-M1, soil body moisture variable quantity is calculated, so as to calculate the water-cut variation situation of sample 12; Due to the constraint of retainer ring 2, upper cover plate 8 is unable to resilience, and still in pressured state, whole process does not exist unloads sample 12 when weighing Carry.
(8) when simulating soil body water absorption course, device is placed in the curing box of setting humidity, moisture is fully infiltrated into sample 12;Record the numerical value of dial gauge 10 and weighed with step (7) methods described every a time for setting and calculate containing for sample 12 Water rate, the purpose of soil body drying and watering cycle experiment is realized so as to reach in the case of precise control moisture content.

Claims (2)

1. the implementation method of drying and watering cycle is carried out in a kind of model engineering in the case of soil body bearing load, it is characterised in that specific step Suddenly it is:
(1) device of drying and watering cycle, including nut, fixation are carried out in a kind of model engineering of setting in the case of soil body bearing load Ring, vertical rod, lower shoe, lower shoe osculum, cutting ring, right-angled intersection rib, upper cover plate and upper cover plate osculum, vertical rod total length have Screw thread is simultaneously fixedly linked with lower shoe;The upper end of right-angled intersection rib is bigger than retainer ring external diameter 1 centimetre on upper cover plate;Retainer ring internal diameter More than cutting ring external diameter, so as to cutting ring can be put into retainer ring to slide up and down and do not loosen be advisable, diagonal bits on retainer ring ring wall Four vertical slots are installed, vertical slot internal thread is mutually twisted with the screw thread of vertical rod, and nut inner thread is mutually twisted with the screw thread of vertical rod; Whole device material is the small duroplasts of strength high density;
(2) the cutting ring sample of required moisture content is made according to planning of experiments, it is big that two-layer and sample etc. are respectively put in sample top and bottom Silk quality gauze, to prevent grogs to be lost in, sample is put on lower shoe together with cutting ring;
(3) by upper cover plate cover alignment to sample, retainer ring is put on the right-angled intersection rib of upper cover plate through vertical rod, and nut is screwed to Rod end position, the weight for weighing whole device is designated as M0;
(4) dial gauge is arranged on Magnetic gauge stand, the measuring head of dial gauge is arranged on the right-angled intersection rib of upper cover plate, and is set Initial value is put, the vertical strain of sample is measured with this;
(5) the class of loading requirement according to planning of experiments, with counterweight, preloading applies pressure on upper cover plate, when sample is by vertical lotus Compression is carried, retainer ring is to be subject to hoop constraint power with upper cover plate slide downward, now sample, is under pressure again, simulates engineering Actual loading situation;
(6) simulate soil body dehydration process to be realized by controlling soil moisture content, allow soil body moisture freely to evaporate or be aided with electricity Speed is accelerated in fan blowing, every a numerical value for the time record dial gauge of setting and measures the weight of sample and is now tried with calculating The moisture content of sample;
(7) when weighing, dial gauge is removed, nut is screwed to along vertical rod and is in close contact with retainer ring, it is vertical to prevent from shedding counterweight Sample resilience after load;The load on upper cover plate is unloaded, whole device is placed on balance weighing mass M 1, according to weighing twice Difference, i.e. M0-M1 calculates soil body moisture variable quantity, so as to calculate the water-cut variation situation of sample;Due to the pact of retainer ring Beam, upper cover plate is unable to resilience, and, still in pressured state, whole process is in the absence of unloading for sample when weighing;
(8) when simulating soil body water absorption course, device is placed in the curing box of setting humidity, moisture is fully infiltrated into sample;Often Record the numerical value of dial gauge and weighed with step (7) methods described every a time for setting and calculate the moisture content of sample, so that Reach the purpose that soil body drying and watering cycle experiment is realized in the case of precise control moisture content.
2. the implementation method of drying and watering cycle is carried out in model engineering as claimed in claim 1 in the case of soil body bearing load, and it is special Levy is that the small duroplasts of the strength high density is PEEK plastics.
CN201510598878.4A 2015-09-19 2015-09-19 The implementation method of drying and watering cycle is carried out in model engineering in the case of soil body bearing load Active CN105203735B (en)

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CN105716939A (en) * 2016-04-01 2016-06-29 桂林理工大学 Device for performing wetting-drying circulation and direct shear test for simulation of soil bearing load condition
CN105865938A (en) * 2016-04-01 2016-08-17 桂林理工大学 Method for conducting dry-wet cycle and direct shear test on simulated load-bearing soil
CN108007780B (en) * 2017-10-26 2020-02-18 华南理工大学 Simulation method and device for dry-wet cycle test of three-direction stress state of roadbed slope
CN109187918B (en) * 2018-08-03 2021-03-16 江南大学 Direct shear sample device for dry-wet cycle test and use method thereof

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JP3445260B2 (en) * 2001-09-10 2003-09-08 鹿島建設株式会社 Self-sealing performance measuring device for swellable soil material
US20100089124A1 (en) * 2008-09-26 2010-04-15 North Dakota State University Integrated porous rigid wall and flexible wall permeability test device for soils
CN201780238U (en) * 2010-09-03 2011-03-30 中国水电顾问集团昆明勘测设计研究院 Creep apparatus for concrete subject to pressure
CN102401778B (en) * 2011-04-20 2013-10-30 河海大学 Device and method for measuring swelling representation parameters of swelling soil
CN102798575B (en) * 2012-07-30 2014-10-15 南京林业大学 Large-scale multifunctional frozen soil-composition contact surface cycle direct shear apparatus and test operation method
CN203232030U (en) * 2013-05-08 2013-10-09 山东大学 Dry-wet cyclic swelling-shrinkage measuring device for non-load swelling soil

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