# RS2

<b>Finite Element Analysis for Excavations and Slopes</b><br><br> <i>RS2</i> 9.0 is a powerful 2D elasto-plastic finite element stress analysis program for underground or surface excavations in rock or soil. It can be used for a wide range of engineering projects and includes finite element slope stability, groundwater seepage analysis, support design, joint network modeling, and much more. With <i>RS2</i>, users can quickly create and analyze complex multi-stage models. Slide files can be imported for slope stability analysis in <i>RS2</i>. <br><br>For a comprehensive program overview, including a description of available features and options, see the <a href="https://www.rocscience.com/help/phase2/webhelp9/phase2.htm">Online Help</a>.

### Consolidation

### Results Interpretation

- If a particular stage does not converge, but subsequent stages appear to converge, is the model stable or unstable?
- Why might different analysis results be obtained without changing the model?
- Can minimum principle strain or extension strain be plotted in RS2?
- How do I model ubiquitous joints?
- How can I change the displacement results scale?
- How can I graph user-defined data?

### General Modeling and Analysis Tips

- How are loads applied in an axisymmetric analysis?
- How do I define the stress field in RS2?
- Can RS2 be run in batch mode?
- What strain limit can RS2 handle?
- How can I carry out a back analysis?
- When using stage factors, what stage are the factors relative to?

### Excavations

- How do I model disturbed zones in RS2?
- When modeling a coal mine in RS2, is it possible to limit the slot convergence?
- Is it possible to apply a cracked second moment of inertia?
- What properties should I use for split sets?
- Can I use the pseudo-static seismic load capabilities for excavations?
- What bond strength and stiffness is recommended for swellex bolts?

### Materials

- Should I use the intact rock modulus of elasticity or the modulus of the rock mass?
- What is the difference between the Field Stress and Body Force options?
- Can RS2 models include changes in material properties over time?
- Is it possible to change a material modulus over different stages?
- Is the shotcrete in RS2 based on cylinder or cube strength?
- What does it mean if my rock appears to be failing in situ before any mining?

### Shear Strength Reduction (SSR)

- What are some general guidelines for carrying out an SSR analysis in RS2?
- How do I include joints in the SSR analysis?
- Can SSR analyses be done for tunnels?
- What is the critical SRF?
- Do I need to add a tension crack to my RS2 SSR model?
- How do I interpret the SRF value and the displacements that result from SSR analysis?

### Piles & Structural Interface

- How can I model lateral earth pressure on a bored pile wall?
- How do I model a structural interface that is not continuous in the out of plane direction?
- How can I model a structural interface in RS2?
- How can I use RS2 to calculate the deformation and moments of a sheetpile wall?
- How can I account for pile spacing out of plane?

### Joints

- Can I use RS2 to look at toppling failure?
- How do I define a jointed rock mass in RS2?
- How does unchecking joint shear affect joint-bolt interaction?
- How do I define joints in RS2?
- How can stacked concrete blocks be modeled in RS2?
- Is it possible to specify different joint properties for tension and compression?

### Groundwater

- A note on modeling Discharge Sections in RS2
- Can RS2 groundwater analysis be used for rock?
- Why are Stage 1 displacements not zero when an effective stress analysis is performed?
- Why are pore pressures above the groundwater table negative, and how is this affecting the analysis?
- When applying pressure on a composite liner, how is the pressure applied?
- How do I model a horizontal drain?