Statewide Calibration of CPT Direct Design Methods Using Static Load Test Data: Research Project Capsule [24-3GT]

Details

• Creators:
  Abu-Farsakh, Murad Y. ; Rupnow, Tyson ; Zhang, Zhongjie “Doc”
• Corporate Creators:
  Louisiana Transportation Research Center
• Corporate Contributors:
  Louisiana. Department of Transportation and Development ; Louisiana State University (Baton Rouge, La.)
• Subject/TRT Terms:
  Calibration Cone Penetrometers Load And Resistance Factor Design Load Tests Pile Foundations
• Publication/ Report Number:
  24-3GT
• Resource Type:
  Brief
• Geographical Coverage:
  Louisiana;United States
• Edition:
  Research Project Capsule
• Corporate Publisher:
  Louisiana Transportation Research Center
• Abstract:
  Deep foundations are typically considered when subsurface soil conditions are weak and unable to safely support superstructure loads. In these cases, pile foundations are used to carry superstructure loads and transfer them deep into the ground. Therefore, an accurate assessment of pile resistance is crucial for the safe and economical design of pile foundations and the performance of pile supported infrastructures. Most of the soil deposits in southern Louisiana are soft in nature, and the high percentage of wetlands, marshes, swamps, bayous, rivers, and lakes makes it necessary to consider using deep foundations in the design of transportation infrastructure. Consequently, pile foundations are often used by the Louisiana Department of Transportation and Development (DOTD) to support highway bridges and other transportation infrastructures. The CPT (or CPTu) test is one of the most useful in-situ tests for soil characterization. The CPT/CPTu is a simple, fast, robust, reliable, and economical test that can provide continuous soundings of subsurface soils. The CPT measures cone tip resistance (qc), sleeve friction (fs), and pore water pressure (U1 or U2) during intrusion. These measurements can be used effectively for soil identification and classification and for the evaluation of different soil properties. Due to the similarity between the cone and pile, the determination of pile resistance from CPT data was among the earliest applications of CPT. With the growth of the pile load test (PLT) database to include CPTu data, all direct CPT/CPTu methods can be evaluated, existing methods can be modified with additional data, and new CPT/CPTu methods can be developed. It may be possible to organize the large pile-CPT/CPTu database by state region for the regional evaluation of different pile-CPT methods and their LRFD calibration. It is also possible to extend the CPT methods to include other pile types (e.g., H-piles, pipe piles, and timber piles).
• Format:
  PDF
• Funding:
  TT-Fed/TT-Reg-5
• Collection(s):
  US Transportation Collection
• Main Document Checksum:
  urn:sha-512:27868ad9a1946f2c6461d58a31dcf4d77bda6437a811adaa9176ffc9b3ff6756cd370ea69b4266380ee53c2c005f002dcbd8c013678e6683120dbe094dc91554
• Download URL:
  https://rosap.ntl.bts.gov/view/dot/74198/dot_74198_DS1.pdf
• File Type:
  [PDF - 310.96 KB ]