Soil testing for a few months in Madhavaram to prevent cave-ins Phase II

Chennai Metro Rail Limited (CMRL) planned for soil testing before starting the tunneling work in Phase II.

Chennai Metro Rail Project
Chennai Metro/ Image for representation purpose only

Chennai: There were several road caves in Phase 1, of Chennai Metro Rail. Now, Chennai Metro Rail Limited (CMRL) in order to be safe from loopholes in upcoming phase II. Planned for soil testing for a few months in Madhavaram before carrying out tunneling work.

Chennai Metro Rail Limited (CMRL) has also decided to make some changes in the alignment according to soil conditions as per officials’ decision. Even though these changes will be minor ones.

CMRL Phase II Network Map
Chennai Metro Phase II Network Map (PC: CMRL)

Official said that these changes will be only minor ones. We have planned to do it as we had issues of roads caving-in some areas in phase I because of loose soil and want to avoid them in this phase.

About Phase II Project

The Phase II will criss-cross the city which will consists nearly 108km with 116 stations of this, about 81km out of which 88 stations will be underground while the elevated track will be 27 km long with 28 stations. This is such huge length of section which needs to be constructed in small section; at first the CMRL will construct a 52 km stretch from Madhavaram to CMBT and Madhavaram to Sholinganallur.

Now, the most important step for the project soil testing which has to begin at Madhavaram and will go on for a few months. This is only possible when we have idea the soil conditions are. And how can tunnel work for nearly 81 km is possible that to without affecting the residents or buildings located along this alignment. Based on the results, we will make some changes in the alignment,” official said.

Further he added that our experts say it may be challenging to make changes in the alignment according to the soil conditions. An engineering expert from IIT-Madras said mixed soil conditions prevail in many of the areas. “If the He also share expert view, expert from IIT-Madras said the CMRL drilled holes to identify soil type underground, but there are more sophisticated methods which can help in knowing the conditions accurately.
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“They can do geophysical testing of soil which will give them continuous profiling of soil conditions. But above all this, instead of making changes in the alignment, they can safely carry out tunneling with ‘soil stabilization’ — a process of altering soil properties to better its strength.”

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