CN102691308A - Reinforced gravity type retaining wall antiknock construction - Google Patents

Abstract

The invention discloses a reinforced gravity type retaining wall antiknock construction, comprising a wall surface, a wall body, a wall back and a substrate. The construction of the invention has the characteristics that the wall back is equipped with a connecting structure and a bracing apparatus, one end of the bracing apparatus is connected with the wall back through the connecting structure, other parts stretch into a supported soil body and are connected with the supported soil body as a whole body. By adopting the gravity type retaining wall antiknock construction of the invention, after the bracing apparatus stretches into the wall, the construction work is allowed to work together with the filling soil after the wall, which enhances the anti-overturning (antiknock) capability of the gravity type retaining wall without increasing a retaining wall cross section,, substantially reduces the cost of the gravity type retaining wall, and provides economy and practicability.

Description

A kind of reinforcement gravity retaining wall anti-seismic construction

Affiliated technical field

The present invention relates to civil engineering, be specifically related to supporting subgrade retaining wall structure.

Background technology

Retaining wall is meant that the supporting roadbed bankets or the hillside soil body, prevent to banket or the structure of soil deformation unstability.In the retaining wall cross section, be called the wall back of the body with the position that is directly contacted by the supporting soil body; Position relative with the wall back of the body, that face sky is called metope; Be called substrate with the position that ground directly contacts; End face relative with substrate, wall is called the wall top; The front end of substrate is called toe of wall; The rear end of substrate is called the wall heel.According to retaining wall the position difference is set, be divided into curb wall, embankment wall, cutting wall and hillside wall etc.The retaining wall that is arranged at side slope of embankment is called the embankment wall; The retaining wall that the wall top is positioned at curb is called the curb wall; The retaining wall that is arranged at cut slope is called the cutting wall; Be arranged on the hillside, the covering layer soil body that possibly cave on the supporting hillside or the retaining wall of broken rock are called the hillside wall.Mechanism according to stability of the retaining walls is different, and retaining wall has a lot of forms again, mainly contains gravity retaining wall, anchorage plate type retaining wall, reinforced earth retaining wall etc.

Gravity retaining wall refers to the retaining wall that relies on wall body deadweight opposing soil body lateral pressure; In civil works; Come a soil body of blocking down the discrepancy in elevation through retaining wall commonly used, and gravity retaining wall is a kind of form of using morely, comprised face upward inclined, the inclined of bowing, weight formula etc.What in general, the design of this kind gravity retaining wall was relatively guarded is many; But also have because of the inconsiderate barricade that causes collapses, even even whole the slip or the situation because of taking place to come down and pushed over takes place in ground.The major defect of at present common gravity retaining wall is: the cross section is big, collapse that the number amount is many, construction speed waits slowly; A prior problem is poor seismic behavior in the high earthquake intensity of earthquake area; This time Wenchuan earthquake has caused a large amount of gravity barricades in earthquake mountain area to destroy, and has brought great economic loss to country.Existing mainly is to adopt to increase the barricade cross section to overturning or slip resistance analysis (antidetonation) the ability design that increases the gravity barricade, conducts oneself with dignity and resists seismic forces thereby increase barricade, but make bricklaying quantity increase, and has improved the cost of barricade, uneconomical.

Summary of the invention

Shortcoming in view of prior art the objective of the invention is to design a kind of novel reinforcement gravity retaining wall anti-seismic construction, makes it to overcome the above shortcoming of prior art.

The objective of the invention is to realize through following means.

A kind of reinforcement gravity retaining wall anti-seismic construction; Comprise metope, body of wall and the wall back of the body, substrate; It is characterized in that the wall back of the body is equipped with a syndeton and a lacing wire device, said lacing wire device one end is connected with the wall back of the body through syndeton; Remainder stretches into by in the soil body of supporting, is connected as a single entity with the supporting soil body.

Compared with prior art, the invention has the beneficial effects as follows: be provided with the lacing wire device behind at the gravity barricade, after this lacing wire device stretches into wall, make the acting in conjunction of banketing behind itself and the wall, improve the gravity retaining wall resistance to capsizing greatly, thereby satisfy shockproof requirements.Through large vibration table test contrast, under same geological process, the gravity barricade has produced the destruction of toppling, and the influence of the gravity reinforced soil retaining wall of same cross-sectional is less, and the displacement of toppling is controlled within the reasonable range.With basic earthquake intensity 9 degree is example, and the top displacement of reinforcement gravity retaining wall wall is compared with traditional gravity formula retaining wall and reduced 48.95%.And need not can not increase the bricklaying quantity of use certainly to increase overturning or slip resistance analysis (antidetonation) ability that the barricade cross section increases the gravity barricade yet, and greatly reduce the cost of barricade, economical and practical, promote very easy.

Description of drawings

Fig. 1 is the structure sectional view of reinforcement gravity retaining wall embodiment of the present invention.

Fig. 2 is that the lacing wire device of embodiment 1 connects sketch map.

Fig. 3 is the connection sketch map of the netted GSZ scheme of reinforcement gravity retaining wall of the present invention.

Fig. 4 is the present invention wedge force analysis figure that slides.

Fig. 5 is a reinforcement gravity retaining wall soil wedge muscle power polygon of the present invention.

The specific embodiment

In solving above-mentioned practical problem, concrete technical measures below the present invention adopts:

The lacing wire device is that a plurality of lacing wire bars link to each other with wall respectively: in the wall back of the body reinforcing bar is installed, the syndeton of described lacing wire bar is fixed on the reinforcing bar and links to each other with the wall back of the body, and anticorrosion with asphalt seal.The lacing wire device is netted GSZ: in the wall back of the body reinforcing bar is installed, thereby the syndeton of netted GSZ is fixed on the reinforcing bar and links to each other with the wall back of the body.The lacing wire device also can be geotextile or geotechnological muscle band: in the wall back of the body reinforcing bar is installed, thereby the syndeton of geotextile or geotechnological muscle band is fixed on the reinforcing bar and links to each other with the wall back of the body.

Below in conjunction with accompanying drawing and embodiment the present invention is described further.

Embodiment 1:

Like Fig. 1, shown in Figure 2, a kind of reinforcement gravity retaining wall comprises metope 1, body of wall 2 and the wall back of the body 3, substrate 6, and described wall is installed with reinforcement bar in carrying on the back in 3.Lacing wire device 4 is made up of a plurality of lacing wire bars; Thereby an end is fixed on the reinforcement bar and links to each other with the wall back of the body 3, and remainder stretches into by in the supporting soil body 5, is connected as a single entity with the supporting soil body 5; Above-mentioned a plurality of lacing wire bar is parallel, and a plurality of lacing wire bar and substrate 6 parallel installations.The lacing wire bar can also be built simultaneously making above-mentioned gravity reinforced soil retaining wall, and it is embedded in the barricade, build simultaneously with barricade, but and the lacing wire bar with by the method for attachment of the supporting soil body 5 also the existing technology of flexible Application be connected.

Embodiment 2

Like Fig. 1, shown in Figure 3, a kind of reinforcement gravity retaining wall comprises metope 1, body of wall 2 and the wall back of the body 3, substrate 6, and described wall is installed with reinforcement bar in carrying on the back in 3.Lacing wire device 4 is made up of netted GSZ; Thereby an end is fixed on the reinforcement bar and links to each other with the wall back of the body 3, and remainder stretches into by in the supporting soil body 5, is connected as a single entity with the supporting soil body 5; Above-mentioned netted GSZ is parallel, and a plurality of netted GSZ and substrate 6 parallel installations.Netted GSZ can also be built simultaneously making above-mentioned gravity reinforced soil retaining wall, and it is embedded in the barricade, build simultaneously with barricade, but and netted GSZ with by the method for attachment of the supporting soil body 5 also the existing technology of flexible Application be connected.Simultaneously, because GSZ is a kind of light weight, have the plane net material of certain flexibility, be easy to on-the-spot cutting and be connected, can overlappingly overlap yet, easy construction does not need special construction machinery and professional and technical personnel.

Embodiment 3

A kind of reinforcement gravity retaining wall comprises metope 1, body of wall 2 and the wall back of the body 3, substrate 6, and described wall is installed with reinforcement bar in carrying on the back in 3.Lacing wire device 4 is made up of one or more geotextiles; Thereby an end is fixed on the reinforcement bar and links to each other with the wall back of the body 3, and remainder stretches into by in the supporting soil body 5, is connected as a single entity with the supporting soil body 5; Above-mentioned a plurality of geotextile is parallel, and a plurality of geotextile and substrate 6 parallel installations.Geotextile can also be built simultaneously making above-mentioned gravity reinforced soil retaining wall, and it is embedded in the barricade, build simultaneously with barricade, but and geotextile with by the method for attachment of the supporting soil body 5 also the existing technology of flexible Application be connected.

The manufacture process of geotextile is at first to be processed into silk, short fiber, yarn or band to polymer raw material, and then processes the geotextile of plane structure.Geotextile can be divided into by manufacturing approach and spins (weaving) geotextile and nonwoven (non-woven) geotextile.Have and spin geotextile and be interwoven by the warp and the parallel of two groups of parallel orthogonal thereto or obliques.Nonweaven geotextile is to do directed or random arrangement to fiber, again through processing.Different according to the method that connects fiber, can be divided into chemistry (cementing agent) connection, heating power connection and three kinds of bind modes of mechanical connection.

The outstanding advantage of geotextile is in light weight, whole continuity good (can make larger area integral body), and easy construction, tensile strength is higher, and corrosion-resistant and antimicrobial aggressivity is good.Shortcoming is without specially treated, and anti-uv-ray is low, as outside being exposed to, receives ultraviolet direct irradiation easy ageing, but as directly do not expose, then anti-aging and endurance quality is still higher.So relatively be fit to use in the present invention.

Embodiment 4

A kind of reinforcement gravity retaining wall comprises metope 1, body of wall 2 and the wall back of the body 3, substrate 6, and described wall is installed with reinforcement bar in carrying on the back in 3.Lacing wire device 4 is made up of one or more geotechnological muscle bands; Thereby an end is fixed on the reinforcement bar and links to each other with the wall back of the body 3, and remainder stretches into by in the supporting soil body 5, is connected as a single entity with the supporting soil body 5; Above-mentioned a plurality of geotechnological muscle band is parallel, and a plurality of geotechnological muscle band and substrate 6 parallel installations.Geotechnique's muscle band can also be built simultaneously making above-mentioned gravity reinforced soil retaining wall, and it is embedded in the barricade, build simultaneously with barricade, but and geotechnological muscle band with by the method for attachment of the supporting soil body 5 also the existing technology of flexible Application be connected.

Geotechnique's muscle band is through the stress diffusion of the composite cushion of " pan soil plate " formula; Adjustment stress distribution and enhancing lateral confinement ability etc., because the constraint of reinforcement cushion, the side direction of prevention subgrade is extruded and is swelled; Strengthen the globality and the rigidity of bed course, reduced the sedimentation and deformation of ground.

Below in conjunction with Fig. 4 and Fig. 5 seismic design of the present invention is done further to set forth, this Seismic Design Method all is suitable for for above-mentioned instance.

With curb reinforcement gravity retaining wall is example, gets the retaining wall of unit length and analyzes.If the retaining wall height is H, the retaining walls back of the body is upright, the no ground load that bankets behind the wall, and banketing behind the wall is sand, and when not establishing GSZ, the wall back of the body is δ with the angle of friction of the soil body, and the wall back of the body angle of friction behind the reinforcement is δ ₀Retaining wall displacement forward under the active earth pressure effect (translation or rotation) when being in state of limit equilibrium when banketing behind the wall, produces a slip plane AB in banketing, with the vertical curve angle be θ.At this moment, form a slip wedge ABC, as shown in Figure 4.

Earthquake inertia force k _hW acts on the rib body ABC center of gravity of supposing to break, the direction level, and the earthquake angle is η; Counter-force R on sliding strong the AB, size is unknown, and action direction becomes with the AB normal clockwise

The angle (

Angle of internal friction for soil); Wall is P back to the reaction force of the soil body _AE, can simplify being decomposed into respectively the reaction force ∑ T that the anti-power of the work E that caused by soil body active earth pressure and GSZ frictional force cause _iAccording to the equilibrium of forces principle, soil wedge muscle power polygon is seen Fig. 5.

Utilize the mathematics sine,

The active earth pressure E that only has the soil body to cause _aBe the function of angle theta between slip-crack surface and the horizon, the soil pressure E of practical function on retaining wall _aShould be E _Max, promptly ask the extreme value of E.

$\frac{\mathrm{dE}}{\mathrm{d\θ}}=0$

Can try to achieve angle of rupture:

About T _iConfirm that the GSZ frictional force of unit width retaining wall is:

T _i＝2γ·h _i·L _ai·f·b _i

In the formula, γ---unit weight bankets;

Friction factor between f---GSZ and the filler should be confirmed according to on-the-spot resistance to plucking test, if there is not experimental data, can adopt 0.3～0.4;

h _i---the distance on i layer GSZ to wall top;

T _i---the frictional force that i layer GSZ produces;

b _i---in the unit width barricade scope, i layer GSZ and the contact width that bankets;

L _Ai---i layer GSZ extends to the length in banketing in plane of fracture both sides,

$L_{\mathrm{ai}}=\frac{{\mathrm{\σ}}_i}{2\mathrm{\γ}\·h_i\·f\·b_i}$

σ _i---GSZ tensile strength

Wall is back to the actual reaction force horizontal component of the soil body:

P _AEx＝∑T _i+E _a·cosδ

Wall is back to the vertical component of actual reaction force of the soil body:

P _AEy＝E _a·sinδ

Convolution (13), (14), wall is back to the actual reaction force P that bankets _AEWith angle of friction δ ₀For:

$P_{\mathrm{AE}}=\sqrt{{{\mathrm{PP}}_{\mathrm{AEx}}}^2+{P_{\mathrm{AEy}}}^2}$

δ ₀＝arctan(P _AEy/P _AEx)

At this moment, the moving coefficient of stability of reinforcement gravity retaining wall antiskid and the overturning or slip resistance analysis coefficient of stability

are:

$K_c^{*}=\frac{(W+P_{\mathrm{AE}}\sin {\mathrm{\δ}}_0)\tan {\mathrm{\φ}}_b+F}{k_{h}W+P_{\mathrm{AE}}\cos {\mathrm{\δ}}_0}$

$K_0^{*}=\frac{W\·x_c+P_{\mathrm{AE}}\sin {\mathrm{\δ}}_0\·B+F\·h_0}{k_{h}W\·y_c+P_{\mathrm{AE}}\cos {\mathrm{\δ}}_0\·h}$

Design is got $K_c^{*}\≥1.3,$ $K_0^{*}\≥1.6.$

Through the moving coefficient of stability

of checking computations antiskid and the overturning or slip resistance analysis coefficient of stability

when meeting the demands; Then satisfy design; Otherwise, should readjust the muscle strip length and checking computations are carried out in the retaining wall cross section.

Claims (4)

1. reinforcement gravity retaining wall anti-seismic construction; Comprise metope, body of wall and the wall back of the body, substrate; It is characterized in that the wall back of the body is equipped with a syndeton and a lacing wire device, said lacing wire device one end is connected with the wall back of the body through syndeton; Remainder stretches into by in the soil body of supporting, is connected as a single entity with the supporting soil body.

2. the reinforcement gravity retaining wall anti-seismic construction according to claim 1 is characterized in that: said lacing wire device stretches into and stretches into by the lacing wire bar in the soil body of supporting for parallel with substrate.

3. the reinforcement gravity retaining wall anti-seismic construction according to claim 1 is characterized in that said lacing wire device is the netted GSZ of going along with sb. to guard him the contiguous supporting soil body.

4. the reinforcement gravity retaining wall anti-seismic construction according to claim 1 is characterized in that, said lacing wire device is the geotextile or the geotechnological muscle band of going along with sb. to guard him the contiguous supporting soil body.

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