Which of the following staterments is NOT corree? 45. (a) Rock Q uality Designat

Question

Which of the following staterments is NOT corree? 45. (a) Rock Q uality Designation (RQD) is a mensure of the degree of fracturing of rock mass (b) RQD, core recovery and rate of penetration are all measures of rock strength. (c) Fracture orientation in a rock does not affect its Safe Bearing Pressure. (d) Shear strength of a rock is determined by its cohesion and internal friction. (e) Safe Bearing Pressure of weathered mudstone is about half of that of intact mudstone. 46. Which of the following statements is NOT correcet? (a) A walkover study precedes the desk study. (b) The costs of a site investigation are typically less than 5% of the total costs of a civil engineering project. (c) Trial pits and trenches are the cheapest method of shallow ground investigation. (d) The main stage of a site investigation typically involves soil testing in the laboratory (e) After the final report of a site investigation, there is a stage during excavation where potential changes of ground conditions are monitored The position of buried leaking plastic barrels and the extent of resulting groundwater contamination would be best investigated using which two methods? (a) GPR survey and gravity survey. (b) Magnetic survey and seismic refraction survey (c) Trial pits and groundwater sampling (d) Resistivity survey and GPR survey (e) Seismic refraction survey and GPR survey. 47·

Explanation / Answer

45.C. It do effect the safe bearing pressure, if the orientation of fracture is in the direction where pressure is applied it will be dangerous in case we have constructed any structure there. As the structure will get damaged.

46.E. Potential changes of ground conditions through excavation are mentioned before the final report of site investigation.

47.D.But for this the minimum level of contamination (which can be detected over the natural scatter is herein called the threshold value) must be known before the resistivity method can be applied with confidence.

48. D. Resistivity method is used in the study of horizontal and vertical discontinuity in the electrical properties of the subsurface.

49. A.The collapse was caused by the build-up of water in the accumulated rock and shale tip, which suddenly slid downhill in the form of slurry.

50. D.

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