Inclined backfill
WebIn this paper, a theoretical model is presented and applied to obtain and calculate the lateral pressures exerted on the filling barricade and to understand the effects of the filling process. It is found that the yield stress of cemented backfill increases with curing time and this relationship can be described as an increasing power function. WebApr 8, 2024 · Backfill refers to products or materials used to fill excavations. The most common form is composed of a mixture of gypsum and calcium bentonite. Apart from …
Inclined backfill
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WebFeb 21, 2007 · If a wall is prevented from even slight movement, then the earth remains at or near the value of at-rest conditions. The coefficient of earth pressure at-rest, Ko, for normally consolidated cohesive or granular soils is approximately: Ko, = 1-sin [theta]'. where: [theta]' = effective friction angle. Thus for [theta]' = 30 degrees, Ko, = 0.5. WebNov 3, 2024 · In this paper, the cohesion of the soil element in the fill with an inclined surface is assumed, and the formulas for calculating the active and passive earth …
WebDec 7, 2024 · When the parameters of the inclined backfill stope on the nonlinear elastic foundation are the same as those shown above, the internal friction angle and the uniaxial … WebAug 8, 2024 · Bending and failure behavior of layered cemented tailings backfill (LCTB) was investigated. • The micro crack evolution law of inclined LCTB was investigated. • The number and angle of layer have an obvious effect on the flexural strength of LCTB. • The LCTB bearing structure changes greatly when the layered angle is greater than 5°.
http://www.assakkaf.com/courses/ence454/lectures/handouta.pdf Webward a mass of dry sand with a stress-free inclined surface. The backfill sloping angles used for the tests ranged from-200 to +200 as shown in Fig. 2. All of the earth-pressure experiments mentioned in this paper were conducted in the National Chiao Tung University (NCTU) retaining-wallfacil ity, which is described in the following section ...
WebMar 13, 2012 · Figure 1 shows an inclined retaining wall, with inclined cohesionless backfill subjected to a uniform surcharge intensity of q KN/m 2. A trial plane failure surface [ 1] is …
WebMar 15, 2024 · As shown in Figure 4, under the action of overburden load, the inclined resultant force (f h and f ′ h) is produced on the roadside backfill body and the backfill body in the compression zone. Besides the vertical component force Q′ 0 , there is also a horizontal component force ( f l and f ′ l ), which is expressed as follows raymond waldropWebSep 30, 2024 · Due to obvious differences in the properties of the filling body and surrounding rock, deformation always develops near the contact zone. Thus, determining the damage and failure characteristics of the contact zone between the backfill and surrounding rock is a precondition for safe production in mines. Taking Jinchuan mine as study area, … raymond walk behind electric forkliftWebSep 2, 2016 · In this paper, the slip line method has been used to study the Rankine’s earth pressure coefficients with inclined backfill. The use of this plasticity based method can … raymond waldo of wiWebDec 7, 2024 · A main roof mechanics model of the inclined backfill stope was established to investigate the factors that influence the overburden stability of an inclined coal seam during backfill mining. raymond waites wallpaperWebAllows for non-horizontal backfill (inclined), but must be planar Backfill must be cohesionless for inclined backfill; Assumes a planar slip surface, similar to Rankine Is used for Active and Passive (see above) conditions only; Assumes a homogeneous backfill; Any surcharge must be uniform and cover entire surface of driving wedge raymond waldeckWeband sloping backfill. The reader should obtain these coefficients from published sources for conditions other than those discussed herein. The Rankine active and passive earth pressure coefficient for the specific condition of a horizontal backfill surface is calculated as follows: • (Active) Ka = (1 – sin(φ)) / (1 + sin(φ)) (2.0) simplifying equations with variablesWebFeb 22, 2024 · In underground backfill mining, the stope usually needs to be filled several times, the cured backfill contains several inclined layered surfaces inside, which leads to the reduction of the overall stability of the backfill due to the existence of layered contact surfaces(LCS). In order to study the influence of inclined layered contact surface ... raymond walkie pallet lift 102xm