???? ????????? ?????

??????????о??   ????  100081??

???????????????????????????????????????????????????????????????????????????????????????????????????κ????????????????150ms?????????????????????б?????????????????????????????????????????б?????????????????Χ???????????????Χ??????????????????????????????????????????????????赲???????????????????????????????????????????????????????????????δ????????????

??????????????????????????????

1??????????????

????????????????β???????????????е??????????????м????????β?????????????β????????????????????????1??9??????β???????????????????????????????????β?????????????????н??????????Щ??β???Χ??????к????????????????Χ????????????????????????????????????????????β?????1988???????????50%???????????????????27m????26m????11.5m?????????2679m²???????????8~9?г???????????????3?????????????25???????????????????????????Σ??????????????????????????????????????????????????????绯?????????????в??????С???????μ??????????20cm????????????Χ?????????????????????????????????????????????????0??????????0.5~0.7m?о?????????????????????8.4m?????????????????????????????1??????????????????????2??

?1  ???????????????????

Fig.1  Sketch of surroundings of building demolition blasting

?2  ?????????????????

cutaway view of building demolition blasting

2????????????????

???????β??????????????????????????????????????????????

(1)   ????????????????????????б0.5m???????豣???????????

(2)   ??????????????????9???????????????????????????????0.5m?????

(3)   ??????????Χ????????????????????????????????

(4)   ??????????0.7m?????????????????????????????5~10m??????????????????????????????????????????????

3???????????????

(1)     ?????п?????????п??????????????????п???????????????????????????????????????????п???????????4????????????п?????5~7??4?????????????????°?β?4????????????????????????????????????????????Ч??С???????Χ???????????^[1]??

(2)     ????·???????????????????????ε?????????????????????????????з????????????????????????????????????????????п??Χ?????????????趼?2??(25ms)????????????????????????11??(460ms)??????????п??Χ????12??(550ms)??????????????????????????б??????п????????????????????????塣

(3)     ????????????????????????????п??????峹?????????????????????????????Χ??????????????????????????450??600mm²??400??600mm²???????????????????????????????????????????????????????????????????????????????q?????????????????q=1.2~1.3kg/m³???????????q=1.0kg/m³??2~3??????q=1.0~1.2kg/m³ ??4??????????q=0.8~0.9kg/m³???????????????????Σ??????????????????????????????

(4)     ?????????????????????????????????Χ??????????????????????????????????????????

 a)  ??????????????????÷??????????????????????????????????????????????????????????????????????????????????????????????????????????????

b)  ??????????????????????????????????????Χ???????????????????????????????????????????????????????????????????????????????????

c) ??????????????????1m????????壬???????С??????????????????????????????????÷???????????????????????????????????????????????????????????λ???????

d) ?????п??Χ????????????????????????????????????????????????????????

?????????????????????????????????????????????????????????

(5)     ?????????????????????????????????????????????????????????????赲??????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????Ч????á???????????????????2~3????????????????15~20cm??10#???????2~3????????????????1m??Χ???????????????3m???????????????????????????????????Χ??????????????????????

(6)     ??????????????????????????????0?????????????????????????????????????????????????????????????0.8m~1.0m??

(7)     ?????????鱬???????????????????????????????????????????????????????????????????????????????????????????1???????????????????????????????1m????????????????2.5m?????????????????????????????????????????μ??3??

?3  ????????????????????????

Fig.3  The wave of blasting vibration and collapse vibration near the demolition building

4??????Ч???????

???????????????????????????????????????α????????????????????Ч?????????????????????棺

(1)              ????????????????????????????????????Χ?????0.7m????????????????????κ??????????????????????????????1m?????????????????0.4m??????????Ч??????????α??????????????????????????????????0.4m?????????????????????????0.8m????????????????????????????嵹??????????????б?????4????ó??????????????????????????????????????????????????????б????????????????????????       

?4  ???????????????????

Fig.4 The influence of uneven ground to blasting muck-pile

(2) ????????????????????????????????????????1m???????????????????????1.9cm/s??????????????????????????????????????2cm/s??????????????????????????????1cm/s??????????????С??????????????????????????????Χ?????ж???????????????????????????η??????????????????????????????γ??????λ????0.15s??????????б????????0.85s???????????????????÷??????????????????????????2.4s?????????????α??????????????????????????????0.43s????????????????????????????????????????????????????????????????????????????????????????????0.15s??????????????????????????????????????????????á?????????????????????????????????????????????в???????ν??????????????????????????????????????????????????????????????????????????????????????????????????????????????ж????????????????????????????????????0.5s????????????????????????????????????κ????????????????0.15s???????????????????????ú??????????????????????????^[2]??

(3) ???????Ч???á?????????С?????????????????????????????????????????????Χ????????????????????????????0.7m?????????????????????????????????????

5??????

?????θ???????????????????????????????????????????????

(1) ???????????????б?????????????????????????????????????????????????б??????????????????????Χ????????????????????б??

(2) ?????????????????????????????????????????Χ??????????????????????

(3) ?????????????????????δ????????????????????????????????????壬???????С??????????

(4) ??????????????????????????????????????????????????κ????????????????150ms?????

(5) ????????????????????????????赲?????????????????????????????????????????????????????????Ч?????????????????????????????????????????????Ч????á?

?ο??????

[1]????? ?????? ????? ?? ??????????[M] ?й????????????磬??? 2002?? pp214~220

[2]????????????ɡ?????? ????  ???????????????[M] ?й??????????磬???? 2004?? p119

????????????о????42??????绰??13381058837??01051849315??

email: ynh@rails.com.cn,   ynianh@sina.com 

An example analysis for high frame building demolition blasting in Complex Circumstance

Yang Nianhua, Zhang Zhiyi, Deng Zhiyong, Shi Yayu

(China academy of railway sciences   Beijing  100081 )

Abstract: By an example of high frame building demolition blasting under complex circumstance, this paper analyses several important technical points which guaranteed successful and safe blasting demolition. ??The delay period of back row support pillar should not oversized, the back row column blasting should delay about 150ms after blasting of forestall column of the back row; ??The influence of collapse site evenness and incline direction to muck-pile can not be neglected, under the complex circumstance, can use the incline direction of collapse site to control the bound of  muck-pile; ??The lateral bound of muck-pile collapse mainly depends on the falling and scattering degree of lateral side brick wall????The protective materials of fly-stone should have enough intensity and toughness to prevents the fly-stone throwing, but also must have the good permeability, and causes the explosion gas diffuse freely; ??The bock ward collapse of back row pillar may touch ground for the first time, the collapse vibration is relatively strong.

Key words: direction blasting, demolish, frame structure, collapse vibration