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自1978年12月开始对鲍店北风井冻结段进行了综合实测研究。内容包括:井帮冻土和井壁的温度场;井壁压力;永久地压(特别是其中的水压及外壁渗透情况);内、外壁的纵、环向钢筋应力;内壁混凝土的应变、应力等。至目前的观察表明,地层已达到稳定状态。这里将主要观察结果作如下介绍。一、概况1.地质鲍店北风井位于兖州煤田向斜中部。第四纪地层比较发育,厚度200米左右。由粘土(厚81.2米,占40.3％)、砂质粘土(厚65.65米,占32.5％)、砂及砂砾(厚55.08
From December 1978 onwards, Bao Dian Feng Feng freeze section conducted a comprehensive field study. The contents include: temperature field of well-to-be-frozen soil and borehole wall; wellbore pressure; permanent pressure (especially water pressure and infiltration of outer wall); longitudinal and circumferential reinforcement stress of inner and outer walls; strain of inner wall concrete, Stress and so on. The current observations show that the formation has reached a steady state. Here are the main observations as follows. First, an overview 1. Geological Bao shop Northwind wells are located in Yanzhou coal in central syncline. Quaternary strata more developed, the thickness of 200 meters. It consists of clay (thickness 81.2 m, 40.3%), sandy clay (thickness 65.65 m, accounting for 32.5%), sand and gravel (thickness 55.08