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The characteristics of Engineering cases are long duration, high total price and large scales, and there is often controversy between contractors and owners over additional costs arising from price fluctuations and geological differences. It may be unfair if the contract is performed in accordance with the original provisions. Although the law of our country has the principle of Clausula rebus sic stantibus, the number of cases is numerous. This study focuses on the analysis of underground pipeline migration, geological differences, price adjustment practice decisions, and reference to R.O.C laws and regulations, master dissertation and doctoral dissertation, researches and references. The proposition of making suggestions to the parties in the litigation lies Clausula rebus sic stantibus, and finally analyze it from an economic point of view. In view of the cases caused by geological conditions, it is suggested that the geological situation recognized by both parties at the time of contracting need to be put forward first, comparing the geological status at the time of actual performance, and the geological status can be referred to the photos of the execution stage of the contract, the opinions of the supervision unit or the appraisal report of the lawsuit entrust appraisal. If there is a change in the construction method, whether it is a necessary change or not, this part can be supplemented by citing journals, literature and other technical data, or the letter of inquiry when appraising in litigation. The influence of the construction period can be compared with the original contract. The impact of cost should be considered not only because of the increase in quantity, but also because of the sharp fluctuation of prices during the extension period, and compared with the actual cost of the contract. This section shall be analyzed with reference to the drilling report as to whether there are other ways of examining geological differences and, if the contractor did not conduct his own inspection, whether there are reasons for his objective inability to conduct his own inspection. Finally, the court has considerable discretion on how to adjust the change of circumstances, and the contractor can analyze the cost increase, loss situation, impact on the contractor, risk distribution and economic utility maximization. In the case of price adjustment, the changes of various indices, such as the fluctuation of the total index, the index of classified items, the index of individual items and the actual cost of expenditure of each individual item, and the situation of the same work unit price budget of other similar types of tenders in this period, can be used as evidence of objective market fluctuations, and the reasons why price fluctuations are not normal fluctuations. The cost of the contractor's actual additional expenditure is also proposed, taking into account the benefits expected to be obtained from the work, and the court is requested to determine the appropriate allocation.
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