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为了满足海上勘察优质原位测试的需要,压入式压力仪(PIP)已在建筑研究机构(BRE)研制出来。目的是要设计一种能与钻探及海上常用的导线取样设备配合在一起的仪器,使其在容许的时间内做些简易试验,而不是研制一种专用的潜水测试装置.之所以决定研制这种压力仪,因为它不须靠经验判断,而根据试验数据就可直接获取不排水抗剪强度、弹性模量和土壤原位应力的数值。在理论上,这种仪器应该是插入土壤,而又不产生拢动来取得这些最佳参数值。特别是土的原位应力值。因此,研制要求为:
In order to meet the need for quality in situ testing at sea surveys, PIPs have been developed at the Building Research Institute (BRE). The aim is to design an instrument that can be used in conjunction with drilling and the common wire sampling equipment at sea to make simple tests within permissible time rather than to develop a dedicated submersible test set. Because it does not depend on experience to judge, but according to the test data can be directly obtained undrained shear strength, elastic modulus and soil stress in situ values. In theory, this instrument should be inserted into the soil without generating a girth to achieve these optimal parameter values. In particular, the in situ stress of the soil. Therefore, the development requirements are: