SPOILER
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I had a bit of trouble with a couple of the doors as well. From what I remember there are three things you have to do that get you sent to the circular room with the riddle golems. After you complete all three, talk to the Durlag spirit and he will take you to the door you mentioned and it will open. (That is the only way to get through that I know.) The three things you have to do are 1. answer the golem north of the pit rooms riddle 2. click on one of the beds on the far side of the room with the ruins on the floor and 3. click on the throne in the secret area above the acid area. (I never did get the door to the throne room open, but you can stand outside the door and still click on the throne to access its effects
) Hope that helps...
Bthoven