混凝土水化热对白垩系地层冻结壁温度场影响的实测分析

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混凝土水化热对白垩系地层冻结壁
温度场影响的实测分析
杨更社，孙永岗，屈永龙，李庆平，李博融
(西安科技大学建筑与土木工程学院，陕西西安710054)
摘要：为了了解外井壁混凝土水化热对白垩系地层冻结壁温度场的影响规律，通过对新庄
煤矿回风立井冻结壁的两个地层进行温度的现场监测，分析监测数据得到：外井壁混凝土浇筑
后。两个地层的冻结壁内侧温度迅速升高，监测点处的温度最高点达到15．8~C；随着深度的增
加，混凝土水化热对冻结壁的影响范围增大，但冻结壁维持正温的时间减少；在混凝土水化热的
作用下，冻结壁的融化深度介于250～600mm之间；水化热的减少及融化区的水热在温度梯度的
作用下大量向冻结区迁移，致使冻结壁内侧高温部分的温度迅速下降。
关键词：冻结壁；温度场；实测；混凝土水化热
中图分类号：TD265．3 文献标识码：A 文章编号：1671—0959(2014)09-0005-04
Site M easurement Analysis on Concrete Hydration Heat Afected to
Temperature Field of Freezing W all in CretaCeOHS Stratum
YANG Geng—she，SUN Yong—gang，QU Yong—long，LI Qing—ping，LI Bo—rong
(School of Architecture and Civil Engineering，Xi，柚University of Science and Technology，xi，柚71O054，China)
Abstract：In order to understand an influence Iaw of t}le concrete hydration heat from the mine shaft outer liner to the
temperature field of the freezing wall in a Cretaceous stratum，a site temperature monitoring and measuring was conducted
in two strata of the freezing wall of a mine air returning shaft in Xi~huang Mine．The analysis on the monitoring and
measuring data showed that after the outer liner concrete poured in place，inner temperatures of the freezing wall at the two
strata were rapidly increased and a max temperature at the monitoring and measuring point Was reached to 15．8℃ ． With
the depth increased，the influence scope of the concrete hydration heat to freezing wall was increased and a time of the
freezing wall to keep the normal temperature was reduced．Under the role of the concrete hydration heat，a thawing depth
of the freezing wall would be ranging from 250～600mm． the hydration heat reduced and the water heat in the thawing zone
would be greatly migrated to the freezing zone under a role of temperature gradient and thus the temperature of the hi sh
temperature section at the inner freezing wall would rapidly reduced．
Keywords：freezing wall；temperature field；site measurement；concrete hydration heat
随着西部矿井的建设，人们逐渐认识到如何安全的穿
越强度低、遇水软化的白垩系、侏罗系地层，成为了矿井
安全建设的关键点，而冻结凿井法在支护和有效隔绝地下
水方面的优势，使其越来越受到人们的重视⋯ 。
冻结壁内侧需要浇筑井壁以抵抗在冻结壁解冻后的地
压，但是在混凝土浇筑后将会产生大量的水化热，水化热
将会导致冻结壁内侧的升温和融化，这将影响到冻结壁的
安全和稳定。很长时间以来，混凝土水化热对冻结壁的影
响，一直是人们研究的重点，但我国有关混凝土水化热对
冻结壁温度场影响的研究，大部分集中在第三、四系深厚
冲击层，得到的一些理论成果是否适用于西部的白垩
系、侏罗系地层，还有待工程实践来验证，同时针对混凝
土水化热对白垩系地层冻结壁影响的研究不多。
本文依据甘肃省新庄煤矿回风立井的冻结凿井法工程，
对白垩系地层冻结壁的温度场进行监测，得出外井壁混凝
土水化热对冻结壁温度场的影响规律，对该地区矿井的冻