刁奶毫 姚直书 张平

摘 要：为了解决深厚冲积层冻结井筒外壁易产生环向裂缝难题，以杨村煤矿主井冻结段外壁为研究对象，采用现场实测、理论分析和实验室试验相结合的方法，进行了混凝土水化热对外壁受力变形影响分析。研究结果表明，在外壁混凝土入模后，受水泥水化放热反应的影响，混凝土温度快速上升，外壁峰值温度高达55.5℃。随后又开始降温，混凝土产生收缩，由于受到井帮冻土的约束，外壁产生竖向约束拉应力。如村煤矿主井326.7m测试水平竖向温度应力达到了3.63MPa，这是引起冻结井筒外壁产生环向裂缝的主要原因，从而揭示了深厚冲积层冻结井筒外壁易产生环向裂缝机理，并提出了防止混凝土出现环向裂缝的技术措施。

关键词：冻结井筒;外壁;混凝土水化热;温度应力;裂缝

中图分类号： TU528.31文献标志码：A

文章编号：1672-1098（2021）02-0062-06

收稿日期：2020-12-28

基金项目：国家自然科学基金面上资助项目（51674006）;国家重点研发计划资助项目（2016YFC0600902）;安徽省高校学科（专业）拔尖人才学术资助项目（gxbjZD09）

作者简介：刁奶毫（2000-），男，重庆江津人，在读硕士，研究方向：地下工程结构。

Analysis on the Influence of the Stress Deformation of Concrete Hydration

Heat on the Outer Wall

DIAO Naihao，YAO Zhishu，ZHANG Ping

（School of Civil Engineering and Architecture，Anhui University of Science and Technology， Huainan Anhui 232001，China）

Abstract：In order to solve the problem of circular cracks easily occurring on the outer wall of frozen shaft lining in deep alluvium， taking the outer wall of frozen section of main shaft in Yangcun Coal Mine as the research object， the influence of hydration heat of concrete on the stress and deformation of outer wall was analyzed by means of field measurement， theoretical analysis and laboratory test.The results showed that the concrete temperature rose rapidly due to the influence of cement hydration exothermic reaction， and the peak temperature of the outer wall reached 55.5℃.Then the outer wall began to cool down， and the concrete shrank. Due to the constraint of frozen soil， the outer wall produced vertical constraint tensile stress. For example， the horizontal and vertical temperature stress of 326.7m main shaft in Yangcun Coal Mine reached 3.63MPa，which was the main reason for the circumferential fracture in the outer wall of frozen shaft.Therefore，the mechanism of circumferential cracks on the outer wall of frozen shaft in deep alluvium was revealed， and the technical measures to prevent circumferential cracks in concrete were put forward.

Key words：frozen shaft lining; outer wall; hydration heat of concrete; thermal stress; cracks

目前煤炭仍是我國的主要能源，无论是新建矿井还是现有煤矿安全改建工程都需要新建井筒[1]。在深厚冲积层采用冻结法凿井时，外层井壁（外壁）施工过程中混凝土常出现环向裂缝，影响了外壁承载力[2]。当井筒建成、冻结壁解冻后这些裂缝又成为导水通道，加大了内壁的防治水压力[3-4]。为防止冻结壁解冻后井筒出现涌漏水现象，引发淹井事故，进行外壁环向裂缝的产生机理研究具有十分重要的意义。……