为何要进行工程地质长期观测？
参考答案：
（1）工程地质条件的某些要素特别是物理地质作用，都有一个较长时期的发生、发展和消亡的过程；
（2）在任何地质环境中进行工程活动，也必然会伴随有工程地质作用发生，这些作用发展的全过程也需要相当长的时间；
（3）工程地质长期观测工作不仅对某项具体工程具有重要的实际意义，而且对于检验工程地质评价所采用的理论或经验公式是否正确，从而全面发展工程地质理论也有重要的作用。所以要进行工程地质长期观测。
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