A New Method for Preparing Calibration Chamber Specimens

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Description: Research has indicated that gradation, grain shape, soil structure and mineral content can all affect the dilatancy, shear strength under monotonie and cyclic loading conditions and interpretation of in-situ test results for sand. For a chamber specimen of 40 percent fine particle content (FC), 1.5 meters in diameter and 1.5 meters high, it took 18 to 20 days to complete the consolidation process and to reach a confining pressure of 70 kilopascals.3 Water Spray Method The new method developed by the author will be referred to as the water spray method (WSp). For a CPT in a uniform, normally consolidated sand specimen, cone tip resistance (q^sub c^) under the boundary condition of constant vertical and horizontal stress should increase with depth initially and then reach a plateau where q^sub c^ remains a constant.4 The CPT is known for its capability of sensing thin layers of soil with different properties; thus, the stability of q^sub c^ values is a reflection of the specimen's uniformity.
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