Journal of South China University of Technology(Natural Science Edition) ›› 2024, Vol. 52 ›› Issue (5): 71-83.doi: 10.12141/j.issn.1000-565X.230385
• Architecture & Civil Engineering • Previous Articles Next Articles
DING Xiaobin1,2(), YANG Huitai1(
), SHI Yu1
Received:
2023-06-05
Online:
2024-05-25
Published:
2023-09-08
Contact:
杨辉泰(2000-),男,硕士,主要从事地下工程与结构研究。
E-mail:2641804764@qq.com
About author:
丁小彬(1984-),男,博士,副教授,主要从事岩土工程、地下工程等研究。
Supported by:
CLC Number:
DING Xiaobin, YANG Huitai, SHI Yu. Formation Factor Analysis and Evaluation Model Construction of Mud Cake on EPB Cutterhead[J]. Journal of South China University of Technology(Natural Science Edition), 2024, 52(5): 71-83.
Table 1
Quantitative table of influence factors of geological conditions"
风险因子 | 高风险 (75<F≤100) | 中风险 (50<F≤75) | 低风险 (25<F≤50) | 无风险 (0<F≤25) |
---|---|---|---|---|
黏粒含量(d1) | >25%且小于0.075 mm的土粒含量>60% | 25%~15%且小于0.075 mm的土粒含量>30% | 15%~10% | <10% |
塑性指数(d2) | >17 | 10~17 | 6~10 | <6 |
液性指数(d3) | 0.385~0.667 | -0.600~0.385 | 0.667~1.000 | >1或<-0.6 |
耐崩解性(d4) | 0~34% | 34%~75% | 75%~85% | 85%~100% |
Table 2
Quantitative table of influence factors for shield selection"
风险因子 | 高风险 | 中风险 | 低风险 | 无风险 |
---|---|---|---|---|
刀具间距(d5) | 与理论值误差50%以上 | 与理论值误差25%~50% | 与理论值误差10%~25% | 与理论值误差10%以内 |
刀具高差(d6) | <20 mm | 20~35 mm | 35~50 mm | >50 mm |
刀具类型(d7) | 无针对性设计 | 少量针对性设计 | 部分针对性设计 | 针对性设计 |
刀具开口率(d8) | <33%或低于理论值25% | 33%~38%或低于理论值15% | 38%~45%或低于理论值5% | >45%或大于等于理论值 |
搅拌棒数量(d9) | <4 | 4~6 | 6~8 | >8 |
螺旋器相对伸入长度(d10) | <0.25 | 0.25~0.50 | 0.50~0.75 | >0.75 |
冲刷系统(d11) | 无冲刷系统 | 中心区域未设置冲刷孔 | 设置6路以上冲刷管道 | 设置10路以上冲刷管道且中心区域设置有冲刷孔 |
Table 3
Quantitative table of influence factors for construction factors"
风险因子 | 高风险 | 中风险 | 低风险 | 无风险 |
---|---|---|---|---|
启动扭矩(d12) | 大于地层土体摩擦力25%以上 | 大于地层土体 摩擦力10%~25% | 大于地层土体 摩擦力10%以内 | 等于地层土体摩擦力 |
渣土液面高度(d13) | 大于2/3土仓高度 | 1/2~2/3土仓高度 | 小于1/2土仓高度 | 空仓推进或气压辅助 |
停机时间(d14) | >12 h或6倍管片拼装时间 | 3~6倍管片拼装时间 | 2~3倍管片拼装时间 | 等于管片拼装时间 |
土仓压力(d15) | >1.60 max{T0,Te} | (1.40~1.60)max{T0,Te} | (1.10~1.40)max{T0,Te} | <1.10 max{T0,Te} |
刀盘扭矩(d16) | >1.50 max{T0,Te} | (1.30~1.50)max{T0,Te} | (1.10~1.30)max{T0,Te} | <1.10 max{T0,Te} |
总推力(d17) | >1.50 max{T0,Te} | (1.30~1.50)max{T0,Te} | (1.10~1.30)max{T0,Te} | <1.10 max{T0,Te} |
推进速度(d18) | <0.75 max{T0,Te} | (0.75~0.85)max{T0,Te} | (0.85~0.95)max{T0,Te} | >0.95 max{T0,Te} |
螺旋机转速(d19) | <0.75 max{T0,Te} | (0.75~0.85)max{T0,Te} | (0.85~0.95)max{T0,Te} | >0.95 max{T0,Te} |
注入比FIR(d20) | 超出范围25% | 超出范围15% | 超出范围5% | 经验或理论公式结果范围内 |
发泡率FER(d21) | <15 | 15~20 | 20~30 | >30 |
泡沫半衰期(d22) | <4 min | 4~6 min | 6~8 min | >8 min |
渣土温度(d23) | >38 ℃ | 35~38 ℃ | 31~35 ℃ | 28~31 ℃ |
Table 5
Weighting table of risk indicators for mud cake"
二级指标 | 二级指标权重 | 三级指标 | 三级指标权重 | 风险因素(四级指标) | 同级权重 | 全局权重 wi | |
---|---|---|---|---|---|---|---|
地质条件b1 | 0.297 3 | d1 | 黏粒含量 | 0.170 7 | 0.050 7 | ||
d2 | 塑性指数 | 0.449 5 | 0.133 6 | ||||
d3 | 液性指数 | 0.259 6 | 0.077 2 | ||||
d4 | 抗崩解系数 | 0.120 2 | 0.035 7 | ||||
盾构选型b2 | 0.163 8 | 刀具系统c1 | 0.666 7 | d5 | 刀具间距 | 0.088 3 | 0.009 6 |
d6 | 刀具高差 | 0.157 5 | 0.017 2 | ||||
d7 | 刀具类型 | 0.271 8 | 0.029 7 | ||||
d8 | 刀具开口率 | 0.482 4 | 0.052 7 | ||||
非刀具系统c2 | 0.333 3 | d9 | 搅拌棒数量 | 0.163 8 | 0.008 9 | ||
d10 | 螺旋器深度 | 0.297 3 | 0.016 2 | ||||
d11 | 冲刷系统 | 0.539 0 | 0.029 4 | ||||
施工因素b3 | 0.539 0 | 掘进模式控制c3 | 0.112 1 | d12 | 渣土液面高度 | 0.623 2 | 0.037 6 |
d13 | 停机时间 | 0.239 5 | 0.014 5 | ||||
d14 | 启动扭矩 | 0.137 3 | 0.008 3 | ||||
掘进参数控制c4 | 0.554 1 | d15 | 土仓压力 | 0.133 6 | 0.039 9 | ||
d16 | 刀盘扭矩 | 0.410 1 | 0.122 5 | ||||
d17 | 总推力 | 0.253 1 | 0.075 6 | ||||
d18 | 推进速度 | 0.133 6 | 0.039 9 | ||||
d19 | 螺旋机转速 | 0.069 6 | 0.020 8 | ||||
渣土改良效果c5 | 0.214 8 | d20 | 注入比FIR | 0.142 9 | 0.016 5 | ||
d21 | 发泡率FER | 0.428 6 | 0.049 6 | ||||
d22 | 泡沫半衰期 | 0.428 6 | 0.049 6 | ||||
温度控制c6 | 0.119 1 | d23 | 渣土温度控制 | 1.000 0 | 0.064 2 |
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