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土力学发展的初期,所有室内土工试验都是用重塑土样进行的。1932年,Casa-grande 发现天然粘土具有复杂的颗粒结构,遭破坏后的重塑已不再能恢复原状,也更无法在室内加以复制;试验表明,原状土和重塑土之间的力学性质迥然不同。此后,工程界才开始认识到采用原状土测定土的力学性质的必要性,从而促进了不扰动取土技术的发展。然而,不扰动土样在实际上是很难取得的,仅仅由于卸去上覆的和周围的压力,就会不可避免地因天然条件的变化对土样产生
At the beginning of the development of soil mechanics, all indoor geotechnical tests were conducted using remolded soil samples. In 1932, Casa-grande discovered that the natural clay had a complex granular structure, and the remodeling after destruction was no longer able to restore the original shape, and it was even more difficult to replicate indoors; the test showed that the mechanical properties between the undisturbed and remolded soils. It’s very different. Since then, the engineering community has begun to recognize the necessity of using undisturbed soils to determine the mechanical properties of soils, thereby promoting the development of undisturbed earth-fetching techniques. However, it is practically impossible to obtain undisturbed soil samples, but due to the removal of the overlying and surrounding pressures, it is inevitable that changes in the natural conditions will produce soil samples.