Kinematic Analysis — JWGeotech

The Kinematic Analysis left pane selects the failure mode and engineering parameters while the stereonet and results remain visible. Open it from the rail or Analysis menu; sensitivity controls are in the same pane.

Common Inputs

Input	Range or values	Meaning
Failure Mode	None, Planar Sliding, Wedge Sliding, Flexural Toppling, Direct + Oblique Toppling	Selects analysis type.
Global Orientation Filter	Read-only summary	Reports the non-destructive subset configured from the stereonet toolbar.
Slope Dip	0 to 90 degrees	Dip of the slope face when required.
Slope Dip Direction	0 to 360 degrees	Dip direction of the slope face.
Friction Angle	0 to 45 degrees	Shared friction angle used by kinematic checks.
Lateral Limit	0 to 90 degrees	Angular side-limit window for relevant modes.

Failure Modes

Mode	What is tested	Main output
None (Stereonet Only)	No kinematic envelope. Optional raw intersections.	Planes loaded and intersection count.
Planar Sliding	Individual planes that daylight and exceed friction angle within lateral limits.	Compact table of total poles and critical percentages, including an All row.
Wedge Sliding	Intersections of plane pairs that satisfy wedge movement criteria.	Compact table of total intersections and Primary, Secondary, and Critical percentages, including an All row.
Flexural Toppling	Individual planes with poles in the toppling window and beyond the slip limit.	Compact table of total poles and critical percentages, including an All row.
Direct + Oblique Toppling	Plane intersections meeting direct or oblique toppling thresholds.	A compact two-column table with the All total for intersections, Direct, Oblique, and Critical percentages, total poles, and base-plane percentage.

The live Results inspector shows one Kinematic Analysis Results (Failure Mode) table. Category counts and mode, context, filter, and explanation summaries are not repeated in the table. All totals include unassigned No Set data; No Set is not listed as a separate set or set pair. Direct + Oblique Toppling lists each metric on its own row under the All column to fit a narrow Results sidebar. Percentage headings omit %; the values include the percent sign.

Direct-Toppling Convention

Direct-toppling base-plane poles and intersection vectors are classified using circular regions on the stereonet. The primary region lies within the lateral limits and above pole/intersection plunge 90° - slope dip. The friction circle separates sliding base planes (zone 1) from non-sliding release planes (zone 2). Outside the lateral limits, oblique zone 3 uses plunge 90° - friction angle as its outer bound.

The base-plane classification uses those circular zones rather than a separate planar daylight envelope. Inward-dipping base planes are excluded from the reported zones. These geometric results do not calculate forces or a factor of safety.

Sensitivity Analysis

Input	Values or range	Meaning
Sensitivity Analysis	On/off	Enables parameter sweep for supported modes.
Sensitivity Variable	Slope Dip, Slope Dip Direction, Friction Angle	Parameter to vary.
Range Min / Range Max	Mode-dependent degrees	Sweep range.
Step	0.1 to 360 degrees	Increment between sampled values.

When sensitivity is enabled, the chart appears below the sensitivity inputs in the Kinematic Analysis left pane. Its x-axis uses a 1–2–5 nice-spacing scale selected for approximately five to six ticks, and the configured range minimum and maximum are always labelled even when they are not aligned with the nice spacing. Gridlines follow the X and Y axis ticks. Hover the chart, or focus it with the keyboard, to project dotted guides from the nearest calculated sample to the axes and show its exact X and Y values below the graph. Multi-series charts show one horizontal guide and value for each series. Values are not interpolated between calculated samples. All active orientations includes unassigned No Set orientations; unassigned data does not appear as a separate sensitivity scope. Sensitivity is not duplicated in the right Results inspector.

Named analysis scenarios capture the current face geometry, failure mode, and orientation filter together with the critical metric. Applying a scenario restores the shared filter and updates both the stereonet and kinematic results without changing the orientation dataset.