shear box for testing soils

IS 11229 - Shear Box: Scope and Key Specifications

Scope (Clause 3.1 & 4.1)

• Defines materials and dimensions for shear box components used in soil testing.
• Materials must conform to specified Indian Standards (IS).

Materials (Table 1)

Dimensions & Tolerances (Clause 4.1)

• Dimensions as per Figures 2 to 7 in IS 11229.
• Tolerances per IS 2102 (Part 1) - 1980 (Medium class).

Additional Notes

• Equipment may bear ISI Certification Mark (Clause 5.1.1).
• ISI mark ensures compliance with quality, inspection, and testing norms.

Summary Diagram of Shear Box Components

graph TD
  A[Upper Part] -->|Coupled with pins| B[Lower Part]
  A --> C[Grid Plates (2 pairs)]
  B --> D[Base Plate]
  A --> E[Top Plate]
  A --> F[Loading Pad]
  A --> G[Water Jacket]
  B --> H[Stone Plates]

This summarizes the scope, materials, and dimensional control for shear box components per IS 11229.

IS 11229: Components of Shear Box - Key Details

Components (Clause 2.1)

• Upper and Lower Shear Box Parts: Coupled together with two pins.
• Grid Plates: 2 pairs, placed inside the box.
• Stone Plates: Positioned above and below the soil specimen.
• Loading Pad: Applies vertical load.
• Water Jacket: Surrounds the box to maintain moisture conditions.

Dimensions & Tolerances (Clause 4.1)

• Dimensions detailed in Figures 2 to 7 of IS 11229.
• Tolerances per IS 2102 (Part 1) - 1980, medium class.

Typical Dimension Guidelines (from IS 11229 & IS 2102)

Notes:

• The shear box size depends on soil type and test requirements.
• Pins must ensure alignment and smooth sliding.
• Water jacket must be leak-proof for saturation tests.

flowchart LR
    A[Upper Shear Box] -- Pins --> B[Lower Shear Box]
    B --> C[Grid Plates (2 pairs)]
    C --> D[Soil Specimen]
    D --> E[Stone Plates]
    E --> F[Loading Pad]
    F --> G[Water Jacket]

This assembly ensures controlled shear testing under specified conditions. For exact dimensions, refer to IS 11229 Figures 2-7.

IS 11229: Dimensions and Tolerances for Shear Box

Key Points:

• Dimensions: As detailed in Figures 2 to 7 of IS 11229 (all in mm).
• Tolerance Class: Medium class tolerances as per IS 2102 (Part 1) - 1980 (General tolerances for linear/angular dimensions).
• Hole Tolerances: For holes (e.g., 4 holes on all sides), tolerance is +1 mm.
• Material Dimensions:
  • Stone plates: 60 × 60 × 6 mm (Sandstone as per IS 3622-1977).
  • Other parts: Mild steel or brass per IS 513-1973 / IS 292-1983.

Summary Table for Tolerances (from IS 2102 Part 1):

Notes:

• All dimensions and tolerances must be adhered to for interchangeability and proper functioning.
• The ISI mark ensures compliance with these standards.

flowchart TD
    A[Shear Box Dimensions] --> B[Figures 2 to 7 (mm)]
    A --> C[Tolerances per IS 2102 (Part 1)]
    C --> D[Medium Class Tolerances]
    B --> E[Hole Tolerance: +1 mm]
    B --> F[Stone Plate: 60x60x6 mm]
    B --> G[Material: Mild Steel/Brass]

For exact dimensions, refer to Figures 2-7 in IS 11229 and tolerance tables in IS 2102 (Part 1).

IS 11229: Material and Marking Requirements for Shear Box

1. Material Specifications (Clause 3.1 & Table 1)

• Mild Steel: Cold rolled carbon steel sheets.
• Brass: As per specification for brass ingots and castings.
• Sandstone: Selected slabs/tiles of specified size.

2. Marking Requirements (Clause 5.1 & 5.1.1)

Each component must be clearly and indelibly marked with:

• Manufacturer’s name or registered trademark.
• Type of material.
• Date of manufacture.

Optional: ISI Certification Mark may be applied following ISI regulations, ensuring quality and conformity.

Summary Table for Quick Reference

flowchart TD
    A[Shear Box Components] --> B[Upper & Lower Parts]
    A --> C[Grid Plates]
    A --> D[Stone Plates]
    A --> E[Base Plate]
    A --> F[Top Plate]
    A -->

IS 11229: Assembly and Coupling of Shear Box - Key Points

Components (Clause 2.1)

• Upper & lower parts coupled with two pins
• Two pairs of grid plates
• Stone plates
• Loading pad
• Water jacket

Material Specifications (Clause 3.1, Table 1)

Dimensional Tolerances (Clause 4.1)

• Dimensions per Figures 2 to 7
• Tolerance as per IS 2102 (Part 1)-1980, medium class
• Hole tolerance: 4 holes +1 mm each side

Assembly Notes

• Coupling via two pins ensures alignment and shear transfer.
• Holes on all four sides for assembly, dimensioned with ±1 mm tolerance.
• Straight knurling and adjustable screws used for precise fitting.

Summary Diagram of Assembly Components

graph TD
  A[Upper Shear Box Half] -->|Coupled by pins| B[Lower Shear Box Half]
  B --> C[Base Plate]
  A --> D[Loading Pad]
  B --> E[Stone Plates]
  A --> F[Grid Plates (2 pairs)]
  A --> G[Water Jacket]

This ensures a robust, standardized assembly with specified materials and tolerances for reliable shear testing.

IS 11229: Water Jacket Specifications Summary

Material Specification (Clause 3.1, Table 1)

• Water Jacket Material: Mild steel or Brass
• Reference IS Standards:
  • Mild Steel: IS 513-1973 (Cold rolled carbon steel sheets)
  • Brass: IS 292-1983 (Brass ingots and castings)

Dimensional Specifications

• Dimensions are in millimeters (Clause 59.5).
• Detailed dimensions and tolerances for the water jacket are given in Fig. 7 of IS 11229.
• Tolerances follow IS 2102 (Part 1)-1980, medium class.

Key Points:

• Water jacket is a thin metallic enclosure around the shear box to allow water circulation for temperature control during testing.
• Constructed from mild steel or brass sheets as per IS standards.
• Proper fitting and sealing are essential to avoid leakage.

Typical Water Jacket Details (from Fig. 7 & IS 11229 context):

Summary Diagram: Water Jacket Assembly

graph LR
A[Shear Box Lower Half] -- Coupled with --> B[Water Jacket]
B -- Coupled with --> C[Shear Box Upper Half]
B -. Water Circulation .-> D[Water Inlet/Outlet Holes]

For exact dimensions, refer to Fig. 7 in IS 11229 and use IS 2102 (Part 1)-1980 for tolerances.

IS 11229: Quality Control and Certification - Key Points

1. ISI Certification Mark (Clause 5.1.1)

• The ISI mark ensures compliance with IS 11229 under a strict system of inspection, testing, and quality control.
• Licensing and use of ISI mark are governed by the Indian Standards Institution (Certification Marks) Act.
• Continuous ISI surveillance ensures ongoing conformity.

2. Material Specifications (Clause 3.1 & Table 1)

3. Reporting Results

• Final values in tests should be rounded as per IS: 2-1960.

Summary Diagram: Quality Control Flow

flowchart TD
    A[Manufacturing] --> B[Inspection & Testing]
    B --> C{Conforms to IS 11229?}
    C -- Yes --> D[ISI Certification Mark Granted]
    C -- No --> E[Rectification & Re-test]
    D --> F[Continuous ISI Surveillance]

Note: For detailed licensing conditions and quality control procedures, refer to the Indian Standards Institution.

Reporting and Rounding Off Test Results as per IS 11229:

• Rounding Off Rule:
  Final test values (observed or calculated) must be rounded off according to IS 2:1960 (Rules for rounding off numerical values). This ensures uniformity and precision in reporting.

• IS 2:1960 Key Points for Rounding:

  • If the digit to be dropped is less than 5, the preceding digit remains unchanged.
  • If the digit is greater than 5, the preceding digit is increased by one.
  • If the digit is exactly 5, round to the nearest even digit (to avoid bias).
  • Maintain the number of decimal places as required by the test precision.

• Example:

  • 12.234 rounded to 2 decimals → 12.23
  • 12.235 rounded to 2 decimals → 12.24 (since 3rd decimal is 5 and 2nd decimal is odd)

• Additional Notes:
  IS 11229 focuses on shear box specifications and testing methods for soils with max particle size 4.75 mm, but defers rounding rules to IS 2:1960.

Summary Table: Rounding Off (IS 2:1960)

flowchart TD
    A[Final Test Value] --> B{Digit to Drop}
    B -->|<5| C[Preceding Digit Unchanged]
    B -->|>5| D[Preceding Digit + 1]
    B -->|=5| E{Preceding Digit Even?}
    E -->|Yes| C
    E -->|No| D

This ensures consistent and unbiased reporting of soil shear test results per IS 11229 and IS 2:1960.