Understanding geological history when selecting trenchless installation methods: Part three
Published on: October 30, 2019
When it comes to engineers and contractors undertaking new trenchless installation work, it is all about understanding how the ground may behave in response to a given trenchless method. The anticipated behavior considers several complex elements: real-world experience, a fundamental understanding of resultant ground behavior when a specific soil matrix is removed from the ground, strength of the ground to support equipment, a means to stabilize the borehole, and sufficient soil strength to prevent
inadvertent returns (“frac-out”).
One consideration often overlooked is fully understanding the geological history of an area. On large, engineered trenchless installations, it is imperative for the engineer to understand the geological setting of the project, and determine the possible consequences and controlling effects the geology has on the proposed crossing. Part three of this three-part series in the Northeast Journal of Trenchless Technology Practice’s fall issue looks closely at the complications associated with the use of microtunnel boring machines (MTBM) in glacial lake-bed deposits in the Hartford, Connecticut, area. Haley & Aldrich’s Brad Miller, P.G. will briefly examine how deciphering the geologic history (and its anomalies) drives the selection and control of the trenchless method.
Click here to read part three on the effects of New England glacial lakes on microtunneling.
You can also read:
Part one on the effects of the coastal plain barrier lands on long horizontal directional drillings (HDD).
Part two on the effects of glacial and pre-glacial coastal drainages on HDD crossings.