多类型复合顶板锚杆预应力场分布特征及支护优化
投稿时间:2020-05-14  修订日期:2020-09-01  点此下载全文
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作者单位E-mail
李风珍 晋能集团有限公司 科技发展部
天地科技股份有限公司 开采设计事业部 
849190261@qq.com 
焦建康 天地科技股份有限公司 开采设计事业部 849190261@qq.com 
周逸群 天地科技股份有限公司 开采设计事业部  
基金项目:国家自然科学基金资助项目(51804159)
中文摘要:针对煤矿巷道顶板岩层结构的多样性与复杂性,通过大范围顶板原位强度测试和围岩结构窥视,对巷道顶板结构类型进行划分,对比分析了不同顶板类型和锚固参数下锚杆预应力场的分布特征,对复合顶板巷道锚固参数进行了优化,结果显示:晋能集团阳泉矿区主采煤层巷道顶板类型可分为软弱型顶板、软硬相间型、下硬上软型和硬软相间型;无论是单一岩层还是复合岩层,锚杆预应力整体上呈“两拉一压”的分布特征;在复合岩层中,层理面是阻碍锚杆支护应力传递的主要因素,层理面越多,形成的有效压应力范围越小;通过施加高预紧力和使用大护表构件,可以有效扩大锚杆压应力区范围;通过调整锚固长度或锚杆长度,使层理面位于压应力较高的区域,可以有效避免巷道顶板垂向离层和水平错动。以软弱型顶板巷道为例,开展复合顶板巷道围岩锚固支护优化现场实践,验证了理论研究的可行性。
中文关键词:复合顶板  层理面  锚杆支护  预应力场
 
Anchor prestress field distribution characteristics and support optimization of multi type composite roof
Abstract:In view of the diversity and complexity of the roof structure of the coal mine roadway, roof structure type was divided ,through the in-situ strength test of large-scale roof and the peep of surrounding rock structure. The paper has comparative analysised distribution characteristics of prestress field of anchor with different roof types and anchoring parameters and optimized anchorage parameters of compound roof roadway. Results show that the roof types of main coal seam roadway in Yangquan mining area of Jinneng group can be divided into soft roof, soft hard alternate type, bottom hard upper soft type and hard soft alternate type. The distribution characteristics of anchor prestress is , no matter in single or compound rock stratum. In the composite rock stratum, the bedding surface is the main factor that hinders the stress transfer of bolt support,and The more the bedding surface, the smaller the effective compressive stress range. By applying high preload and using large surface protection components, the range of bolt compressive stress area can be effectively expanded. In addition, by adjusting the anchor length or anchor length, the bedding surface is located in the area with high compressive stress, which can effectively avoid vertical separation and horizontal dislocation of the roadway roof. Taking the soft roof roadway as an example, the field practice of surrounding rock anchorage support optimization of composite roof roadway is carried out to verify the feasibility of theoretical research.
keywords:composite roof  bedding surface  bolt support  prestressed field
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